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Quantifying the orbital-to-spin moment ratio under dynamic excitation Appl. Phys. Lett. (IF 4.0) Pub Date : 2024-03-18 Satoru Emori, Rachel E. Maizel, Galen T. Street, Julia L. Jones, Dario A. Arena, Padraic Shafer, Christoph Klewe
The orbital component of magnetization dynamics, e.g., excited by ferromagnetic resonance (FMR), may generate “orbitronic” effects in nanomagnetic devices. Yet, distinguishing orbital dynamics from spin dynamics remains a challenge. Here, we employ x-ray magnetic circular dichroism (XMCD) to quantify the ratio between the orbital and spin components of FMR-induced dynamics in a Ni80Fe20 film. By applying
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The degradation mechanism and stability enhancement of GaSe lateral memristors Appl. Phys. Lett. (IF 4.0) Pub Date : 2024-03-18 Junhao Tang, Runze Zhan, Enzi Chen, Qing Zhu, Weijian Li, Dawei Li, Zhenye Lu, Xi Wan, Kun Chen
Memristors have attracted considerable attention in the fields of high-density memory and artificial intelligence. However, the performance and stability of memristors may undergo noticeable changes over time, particularly in the case of lateral memristors. In this study, based on two-dimensional (2D) GaSe lateral memristors, we observed that the performance of devices degrades rapidly within a week
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Colossal barocaloric effect of the spin-crossover compound {Fe(pz)2(BH3CN)2} near room temperature Appl. Phys. Lett. (IF 4.0) Pub Date : 2024-03-18 Ruixin Li, Zhe Zhang, Yurii S. Bibik, Il'ya A. Gural'skiy, Igor. V. Zatovsky, Zhaodong Liu, Quanjun Li, Bing Li, Georgiy Levchenko, Bingbing Liu
As one of the most likely alternatives to traditional vapor compression refrigeration technology, solid refrigeration technology based on the barocaloric effect (BCE) has attracted extensive attention in recent years. Spin-crossover (SCO) compounds are considered suitable for working at low driving pressures due to high-pressure sensitivity and small hysteresis width. However, the entropy change (ΔSSCO)
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Electrolyte optimization for sodium-sulfur batteries Appl. Phys. Lett. (IF 4.0) Pub Date : 2024-03-18 Janak Basel, Nawraj Sapkota, Mihir Parekh, Apparao M. Rao
Due to high theoretical capacity, low cost, and high energy density, sodium-sulfur (Na-S) batteries are attractive for next-generation grid-level storage systems. However, the polysulfide shuttle leads to a rapid capacity loss in sodium-sulfur batteries with elemental sulfur as the cathode material. Most previous studies have focused on nanoengineering methods for creating stable Na anodes and S cathodes
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Adjustable artificial neuron based on vortex magnetic tunnel junction Appl. Phys. Lett. (IF 4.0) Pub Date : 2024-03-18 Yuxuan Wu, Yanxiang Luo, Like Zhang, Shige Dai, Baoshun Zhang, Yan Zhou, Bin Fang, Zhongming Zeng
In this Letter, we demonstrate an adjustable artificial neuron based on vortex magnetic tunnel junction (MTJ). By applying a bias current to vortex MTJ, the device exhibits splendid characteristics of stochastic switching and nonlinear rectification. The stochastic switching probability induced by spin transfer torque as a function of bias current can simulate sigmoid activation functions. The nonlinear
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Extreme focusing of hard X-ray free-electron laser pulses enables 7 nm focus width and 1022 W cm−2 intensity Nat. Photon. (IF 35.0) Pub Date : 2024-03-15 Jumpei Yamada, Satoshi Matsuyama, Ichiro Inoue, Taito Osaka, Takato Inoue, Nami Nakamura, Yuto Tanaka, Yuichi Inubushi, Toshinori Yabuuchi, Kensuke Tono, Kenji Tamasaku, Hirokatsu Yumoto, Takahisa Koyama, Haruhiko Ohashi, Makina Yabashi, Kazuto Yamauchi
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Photothermal spectroscopy on-chip sensor for the measurement of a PMMA film using a silicon nitride micro-ring resonator and an external cavity quantum cascade laser Nanophotonics (IF 7.5) Pub Date : 2024-03-15 Giovanna Ricchiuti, Anton Walsh, Jesús Hernán Mendoza-Castro, Artem S. Vorobev, Maria Kotlyar, Gustavo V. B. Lukasievicz, Simone Iadanza, Marco Grande, Bernhard Lendl, Liam O’Faolain
Laser-based mid-infrared (mid-IR) photothermal spectroscopy (PTS) represents a selective, fast, and sensitive analytical technique. Recent developments in laser design permits the coverage of wider spectral regions in combination with higher power, enabling for qualitative reconstruction of broadband absorption features, typical of liquid or solid samples. In this work, we use an external cavity quantum
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Auger-limited minority carrier lifetime in GeSn/SiGeSn quantum well Appl. Phys. Lett. (IF 4.0) Pub Date : 2024-03-15 Perry C. Grant, Preston T. Webster, Rigo A. Carrasco, Julie V. Logan, Christopher P. Hains, Nathan Gajowski, Shui-Qing Yu, Baohua Li, Christian P. Morath, Diana Maestas
A minority carrier lifetime of 2.7 ns is measured at 77 K for a GeSn/SiGeSn single quantum well using time-resolved photoluminescence, and subsequent analyses indicate that the lifetime is Auger-limited. The 77 K lifetime is evaluated as a function of stepwise dose of 63 MeV proton irradiation up to a fluence of 1.5 × 1012 p+/cm2 with no discernable reduction in the observed lifetime, which implies
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Improving magnetic-field resilience of NbTiN planar resonators using a hard-mask fabrication technique Appl. Phys. Lett. (IF 4.0) Pub Date : 2024-03-15 A. Bahr, M. Boselli, B. Huard, A. Bienfait
High-quality factor microwave resonators operating in a magnetic field are a necessity for some quantum sensing applications and hybrid platforms. Losses in microwave superconducting resonators can have several origins, including microscopic defects, usually known as two-level-systems. Here, we characterize the magnetic field response of NbTiN resonators patterned on sapphire and observe clear absorption
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Low disorder and high valley splitting in silicon npj Quantum Inform. (IF 7.6) Pub Date : 2024-03-13 Davide Degli Esposti, Lucas E. A. Stehouwer, Önder Gül, Nodar Samkharadze, Corentin Déprez, Marcel Meyer, Ilja N. Meijer, Larysa Tryputen, Saurabh Karwal, Marc Botifoll, Jordi Arbiol, Sergey V. Amitonov, Lieven M. K. Vandersypen, Amir Sammak, Menno Veldhorst, Giordano Scappucci
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Short-depth QAOA circuits and quantum annealing on higher-order ising models npj Quantum Inform. (IF 7.6) Pub Date : 2024-03-12 Elijah Pelofske, Andreas Bärtschi, Stephan Eidenbenz
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Pipeline quantum processor architecture for silicon spin qubits npj Quantum Inform. (IF 7.6) Pub Date : 2024-03-12 S. M. Patomäki, M. F. Gonzalez-Zalba, M. A. Fogarty, Z. Cai, S. C. Benjamin, J. J. L. Morton
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Parametrically driven pure-Kerr temporal solitons in a chip-integrated microcavity Nat. Photon. (IF 35.0) Pub Date : 2024-03-14 Grégory Moille, Miriam Leonhardt, David Paligora, Nicolas Englebert, François Leo, Julien Fatome, Kartik Srinivasan, Miro Erkintalo
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Ultrafast atomic-scale scanning tunnelling spectroscopy of a single vacancy in a monolayer crystal Nat. Photon. (IF 35.0) Pub Date : 2024-03-14 C. Roelcke, L. Z. Kastner, M. Graml, A. Biereder, J. Wilhelm, J. Repp, R. Huber, Y. A. Gerasimenko
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Single-protein optical holography Nat. Photon. (IF 35.0) Pub Date : 2024-03-13 Jan Christoph Thiele, Emanuel Pfitzner, Philipp Kukura
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Quantum interference effects in a 3D topological insulator with high-temperature bulk-insulating behavior Appl. Phys. Rev. (IF 15.0) Pub Date : 2024-03-14 Weiyao Zhao, Kaijian Xing, Lei Chen, Thi-Hai-Yen Vu, Golrokh Akhgar, Yahua He, Abdulhakim Bake, Xiaolin Wang, Julie Karel
The Bi2Se3-family of 3D topological insulators (3DTI) exhibit insulating bulk states and surface states presenting a Dirac cone. At low temperatures, the conduction channels through the bulk of the material are fully gapped, making 3DTIs perfect systems to study the 2D transport behavior of Dirac fermions. Here, we report a 3DTI Bi1.1Sb0.9STe2 with a reduced level of defects, and thus, high-temperature
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Deciphering between enhanced light emission and absorption in multi-mode porphyrin cavity polariton samples Nanophotonics (IF 7.5) Pub Date : 2024-03-14 Elizabeth O. Odewale, Aleksandr G. Avramenko, Aaron S. Rury
It remains unclear how the collective strong coupling of cavity-confined photons to the electronic transitions of molecular chromophore leverages the distinct properties of the polaritonic constituents for future technologies. In this study, we design, fabricate, and characterize multiple types of Fabry-Pérot (FP) mirco-resonators containing copper(II) tetraphenyl porphyrin (CuTPP) to show how cavity
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Integration of low-thermal-budget In2O3 NMOS inverter and GaN HEMT for power electronics Appl. Phys. Lett. (IF 4.0) Pub Date : 2024-03-14 Mritunjay Kumar, Saravanan Yuvaraja, Na Xiao, Manoj Kumar Rajbhar, Ganesh Mainali, Vishal Khandelwal, Xiao Tang, Xiaohang Li
Herein, we demonstrated an “interposer”-style integration of In2O3 FET-based gate-driver circuitry wire bonded to an AlGaN/GaN high electron mobility transistor (HEMT) device grown on a GaN-on-Si substrate, and its feasibility for power electronics was discussed. The normally-on AlGaN/GaN HEMT exhibited a threshold voltage of −2.8 V, with a maximum drain current density of 265 mA/mm. The device also
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Empirical test of the Kelvin relation in thermoelectric nanostructures Appl. Phys. Lett. (IF 4.0) Pub Date : 2024-03-14 Hari Prasad Panthi, Ruchika Dhawan, Hal Edwards, Mark Lee
Thermoelectric (TE) nanostructures with dimensions of ∼100 nm can show substantially better TE properties compared to the same material in the bulk form due to charge and heat transport effects specific to the nanometer scale. However, TE physics in nanostructures is still described using the Kelvin relation (KR) Π = αT, where Π is the Peltier coefficient, α the thermopower, and T the absolute temperature
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Optimum asymmetry for nanofabricated refractometric sensors at quasi-bound states in the continuum Appl. Phys. Lett. (IF 4.0) Pub Date : 2024-03-14 Keisuke Watanabe, Masanobu Iwanaga
A symmetry-protected bound state in the continuum (BIC) is one of the bases for high-resolution photonic refractometric sensors that rely on spectral shifts. However, a trade-off exists between the quality (Q) factors and the resonance amplitudes when the asymmetries of the unit cell are changed, making it difficult to intuitively determine the optimal nanostructural geometry. In this study, we present
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Exploring challenges and potential for a commercially viable piezoelectric energy harvesting system—Can Energy-as-Data concept thrive? Appl. Phys. Lett. (IF 4.0) Pub Date : 2024-03-14 Yang Bai
Over the past two decades, piezoelectric energy harvesting systems have undergone extensive research, spanning from materials to devices and electronics. Recently, there has been a notable introduction of the term “self-powered sensors,” which essentially refers to conventional, older passive sensors, associated with piezoelectric (or triboelectric) nanogenerators. Unfortunately, neither approach has
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Silicon spin qubit noise characterization using real-time feedback protocols and wavelet analysis Appl. Phys. Lett. (IF 4.0) Pub Date : 2024-03-14 Nard Dumoulin Stuyck, Amanda E. Seedhouse, Santiago Serrano, Tuomo Tanttu, Will Gilbert, Jonathan Yue Huang, Fay Hudson, Kohei M. Itoh, Arne Laucht, Wee Han Lim, Chih Hwan Yang, Andre Saraiva, Andrew S. Dzurak
Recently, several groups have demonstrated two-qubit gate fidelities in semiconductor spin qubit systems above 99%. Achieving this regime of fault-tolerant compatible high fidelities is nontrivial and requires exquisite stability and precise control over the different qubit parameters over an extended period of time. This motivates the search for the efficient calibration of qubit control parameters
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Enhancement of spin to charge conversion efficiency at the topological surface state by inserting normal metal spacer layer in the topological insulator based heterostructure Appl. Phys. Lett. (IF 4.0) Pub Date : 2024-03-14 Sayani Pal, Anuvab Nandi, Sambhu G. Nath, Pratap Kumar Pal, Kanav Sharma, Subhadip Manna, Anjan Barman, Chiranjib Mitra
In this study, we report efficient spin to charge conversion (SCC) in the topological insulator (TI) based heterostructure (BiSbTe1.5Se1.5/Cu/Ni80Fe20) by using spin-pumping technique, where BiSbTe1.5Se1.5 is the TI and Ni80Fe20 is the ferromagnetic (FM) layer. The SCC, characterized by inverse Edelstein effect length (λIEE) in the TI material, gets altered with an intervening Copper (Cu) layer, and
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Atomic position and the chemical state of an active Sn dopant for Sn-doped β-Ga2O3(001) Appl. Phys. Lett. (IF 4.0) Pub Date : 2024-03-14 Yuhua Tsai, Masaaki Kobata, Tatsuo Fukuda, Hajime Tanida, Toru Kobayashi, Yoshiyuki Yamashita
We investigated the atomic position and the chemical state of an active Sn dopant for Sn-doped β-Ga2O3(001) using x-ray absorption near the edge structure (XANES) and hard x-ray photoelectron spectroscopy. We found that the Sn dopant had only one chemical state, which was a Sn4+ oxidation state. The bond length around the Sn dopant atom became longer due to the relaxation effect after the Sn dopant
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Enhanced ferroelectric photovoltaic performance of Bi2FeCrO6 thin films for neuromorphic computing applications Appl. Phys. Lett. (IF 4.0) Pub Date : 2024-03-14 Yucheng Kan, Jianquan Liu, Rui Chen, Yuan Liu, Hongru Wang, Mingyue Long, Bobo Tian, Junhao Chu, Ye Chen, Lin Sun
Nowadays, ferroelectric photovoltaic synapses have attracted great attention due to its polarization controllable and self-powered features. However, the large bandgaps of ferroelectric oxide materials limit its application. This study focuses on the enhancement of ferroelectric photovoltaic properties and the synaptic application of Bi2FeCrO6 (BFCO) device. It is found that the bandgap of BFCO can
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Antiferromagnetic magnetostriction of IrMn detected by angular dependent exchange bias Appl. Phys. Lett. (IF 4.0) Pub Date : 2024-03-14 Haoyu Lin, Kun Zheng, Jing Meng, Jiang Liu, Zhenjie Zhao, Dongmei Jiang, Yang Xu, Tian Shang, Qingfeng Zhan
The manipulation of Néel vector of antiferromagnetic (AFM) layer by an applied stress has attracted considerable attention due to the technical importance for AFM-based spintronic devices. Here, we fabricated CoFeB/IrMn and Ni/IrMn exchange bias (EB) bilayers on PMN-PT(011) to quantitatively study the AFM magnetostrictive behaviors of the IrMn layer. Numerical calculations based on the Stoner–Wohlfarth
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Rapid millisecond heating via ferromagnetic resonance in MnFe2O4 nanoparticles Appl. Phys. Lett. (IF 4.0) Pub Date : 2024-03-14 Yongsub Kim, Jae-Hyeok Lee, Rajni Verma, Sang-Koog Kim
This study undertakes an exhaustive analysis of rapid heat generation in MnFe2O4 nanoparticles through ferromagnetic resonance within an ultra-fast timeframe of 1 ms. Real-time monitoring of temperature during single-field-pulse excitations provided detailed insights into the temperature rise profiles. By integrating micromagnetic simulations with analytical modeling—taking into account both convective
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Opto-electrochemical variation with gel polymer electrolytes in transparent electrochemical capacitors for ionotronics Appl. Phys. Lett. (IF 4.0) Pub Date : 2024-03-14 Chandini Kumar, Arun K. Sebastian, Prasutha Rani Markapudi, Mustehsan Beg, Senthilarasu Sundaram, Amir Hussain, Libu Manjakkal
Advanced flexible ionotronic devices have found excellent applications in the next generation of electronic skin (e-skin) development for smart wearables, robotics, and prosthesis. In this work, we developed transparent ionotronic-based flexible electrochemical capacitors using gel electrolytes and indium tin oxide (ITO) based transparent flexible electrodes. Different gel electrolytes were prepared
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1D graphene nanoribbons-mediated defect engineering in 2D MXene for high-performance supercapacitors Appl. Phys. Lett. (IF 4.0) Pub Date : 2024-03-14 Parika Mahajan, Sagar Sardana, Aman Mahajan
Carbon-based supercapacitors have been extensively explored by the virtue of their exceptional performance in terms of charge-storage capacity, electrical conductivity, and good stability. However, the rush to find potential approaches for increasing their specific capacitance and specific energy without adversely affecting the specific power is still exciting. Herein, we synthesized hierarchically
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S-band acoustoelectric amplifier in an InGaAs-AlScN-SiC architecture Appl. Phys. Lett. (IF 4.0) Pub Date : 2024-03-14 L. Hackett, X. Du, M. Miller, B. Smith, S. Santillan, J. Montoya, R. Reyna, S. Arterburn, S. Weatherred, T. A. Friedmann, R. H. Olsson, M. Eichenfield
Here, we report on an acoustoelectric slab waveguide heterostructure for phonon amplification using a thin Al0.58Sc0.42N film grown directly on a 4H-SiC substrate with an ultra-thin In0.53Ga0.47As epitaxial film heterogeneously integrated onto the surface of the Al0.58Sc0.42N. The aluminum scandium nitride film grown directly on silicon carbide enables a thin (∼850 nm thick) piezoelectric film to be
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Field-free switching in perpendicular Ta/CoFeB/MgO multilayers achieved by annealing temperature gradient Appl. Phys. Lett. (IF 4.0) Pub Date : 2024-03-14 Shuanghai Wang, Xingze Dai, Kun He, Jin Wang, Xiaolong Zhang, Qixun Guo, Guanqun Feng, Yongkang Xu, Yafeng Deng, Ruobai Liu, Jun Du, Yong-Lei Wang, Chao Wang, Yongbing Xu, Liang He
Current flowing through heavy metals generates spin current by the spin Hall effect (SHE), and spin current exerts a torque on the adjacent magnetic layer, thereby switching the magnetization direction of the magnetic layer. Normally, an external magnetic field must be used to break symmetry in the response to the SHE torque, to realize deterministic switching. However, the presence of magnetic fields
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Inverse design method of thermal devices with thermal Hall effect Appl. Phys. Lett. (IF 4.0) Pub Date : 2024-03-14 Yuki Sato, Teppei Deguchi, Tsuyoshi Nomura, Ercan M. Dede, Atsushi Kawamoto
Efficient thermal management is important for both performance and efficiency improvements of thermal devices. For designing reasonable materials and structures of such devices, various design methods were proposed where the material thermal conductivity tensors were positive definite and symmetric based on the physical requirements. Here, we propose an inverse design method for thermal devices considering
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Fractal-inspired multifrequency piezoelectric energy harvesters Appl. Phys. Lett. (IF 4.0) Pub Date : 2024-03-14 Jiheng Ding, Daican Zhou, Min Wang, Zhongjie Li, Yi Sun, Huayan Pu, Qiqi Pan, Biao Wang
In this Letter, we propose fractal-based piezoelectric energy harvesters (PEHs) for broadband energy scavenging. The introduction of fractal topology into transducers significantly alleviates the inherent limitation of a narrow working bandwidth in commonly used cantilever PEHs. We conduct a finite element analysis and experiments to exploit the performance of fractal cantilever PEHs with different
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The effect of surface-step-terrace on energy storage density and working temperature of BaZr0.2Ti0.8O3 epitaxial films Appl. Phys. Lett. (IF 4.0) Pub Date : 2024-03-14 Yi-qin Lu, Tian-Yi Hu, Zixiong Sun, Yunbo Zhang, Yupeng Liu, Yanzhu Dai, Guangliang Hu, Ming Liu, Chunrui Ma, Chun-lin Jia
Dielectric film capacitors have been widely used in various electronic devices due to the high energy storage density and high charge–discharge speed. The energy storage performances are highly determined by the strain status of the films. Herein, we improved the energy storage performances of epitaxial BaZr0.2Ti0.8O3 film through surface-step-terrace in the vicinal substrate. It is found that the
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Thermal nanoconversion of ferromagnetic nanoislands Appl. Phys. Lett. (IF 4.0) Pub Date : 2024-03-14 O. J. Barker, A. Mohammadi-Motlagh, A. J. Wright, R. Batty, H. Finch, A. Vezzoli, P. S. Keatley, L. O'Brien
In this work, we investigate the use of post-fabrication thermal nanoconversion (TNC), using a heated scanning probe tip, to modify the magnetic properties of Ni80Fe20 elliptical nanoislands with varying aspect ratio. Despite Ni80Fe20 being unoptimized for TNC, by comparing quasistatic and dynamic magneto-optical Kerr effect microscopy measurements, we demonstrate that TNC at a contact temperature
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Investigation of the surface band structure and the evolution of defects in β-(AlxGa1−x)2O3 Appl. Phys. Lett. (IF 4.0) Pub Date : 2024-03-14 J. Li, X. H. Chen, J. G. Hao, F. F. Ren, S. L. Gu, J. D. Ye
This study examines the electronic and luminescent properties of β-(AlxGa1−x)2O3 (0 ≤ x ≤ 0.42) thin films grown on (0001) sapphire using laser-MBE, with a focus on the evolution of defect energy levels and their impact on surface Fermi level pinning and luminescence. X-ray photoelectron spectroscopy (XPS) and cathodoluminescence (CL) have been employed to analyze surface band bending and defect evolution
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Supersymmetric quantum cascade laser array Appl. Phys. Lett. (IF 4.0) Pub Date : 2024-03-14 Yuhao Jin, Bofeng Zhu, Kian Hua Tan, Satrio Wicaksono, Carlo Sirtori, Soon Fatt Yoon, Qi Jie Wang
Electrically injected supersymmetric (SUSY) quantum cascade laser (QCL) array of the wavelength at around 13.4 μm has been demonstrated. By applying SUSY transformations to the main array with five laser elements, a lossy superpartner array with four laser elements is constructed. As a result, except for the fundamental supermode, which is confined in the main array, other high order supermodes penetrating
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Strong dependence of air stability on thickness in n-doped carbon nanotube thermoelectrics Appl. Phys. Lett. (IF 4.0) Pub Date : 2024-03-14 Bernhard Dörling, Angus Hawkey, Jana Zaumseil, Mariano Campoy-Quiles
We demonstrate that the observed (in-)stability of n-doped carbon nanotube films in air not only depends on the employed dopant but is also strongly affected by sample-specific factors, such as the film thickness and density. We show this for two typical dopants, polyethylenimine and a potassium crown ether complex, by preparing films of increasing thickness. We argue that reports on dopant stability
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Magnetic monopole free motion in two-dimensional artificial spin ice Appl. Phys. Lett. (IF 4.0) Pub Date : 2024-03-14 D. G. Duarte, L. B. de Oliveira, F. S. Nascimento, W. A. Moura-Melo, A. R. Pereira, C. I. L. de Araujo
Magnetic monopole motion (without its partner in a pair) as a function of external magnetic fields is presented as a fingerprint of freedom of these emergent quasi-particles in a two-dimensional artificial spin ice material. Such freedom, required, for example, for further application in magnetricity, is only possible due to ground-state degeneracy, which causes an anisotropic string energy reduction
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High-mobility wide bandgap amorphous gallium oxide thin-film transistors for NMOS inverters Appl. Phys. Rev. (IF 15.0) Pub Date : 2024-03-13 Yong Zhang, Chi-Hsin Huang, Kenji Nomura
Wide bandgap gallium oxide thin-film transistor (TFT) is promising for next-generation sustainable energy-efficient power electronics. In particular, amorphous oxide channel exhibits inherent advantages on mass productions based on a low-temperature processability compatible with cost-effective large-sized glass. Here, we developed hydrogen defect termination to produce amorphous-GaOx (a-GaOx) channel
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Spintronic terahertz metasurface emission characterized by scanning near-field nanoscopy Nanophotonics (IF 7.5) Pub Date : 2024-03-13 Mingcong Dai, Jiahua Cai, Zejun Ren, Mingxuan Zhang, Jiaqi Wang, Hongting Xiong, Yihang Ma, Youwei Wang, Sitong Zhou, Kuiju Li, Zhentao Lv, Xiaojun Wu
Understanding the ultrafast excitation, detection, transportation, and manipulation of nanoscale spin dynamics in the terahertz (THz) frequency range is critical to developing spintronic THz optoelectronic nanodevices. However, the diffraction limitation of the sub-millimeter waves – THz wavelengths – has impaired experimental investigation of spintronic THz nano-emission. Here, we present an approach
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Metasurface with all-optical tunability for spatially-resolved and multilevel thermal radiation Nanophotonics (IF 7.5) Pub Date : 2024-03-13 Shuhui Jiao, Kang Zhao, Jianhui Jiang, Kailin Zhao, Qin Guo, Jingbo Wang, Yansong Zhang, Gang Chen, Qian Cheng, Pei Zuo, Weina Han
Manipulating the thermal emission in the infrared (IR) range significantly impacts both fundamental scientific research and various technological applications, including IR thermal camouflage, information encryption, and radiative cooling. While prior research has put forth numerous materials and structures for these objectives, the significant challenge lies in attaining spatially resolved and dynamically
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Nonlinear optical response of strain-mediated gallium arsenide microwire in the near-infrared region Nanophotonics (IF 7.5) Pub Date : 2024-03-13 Xiangpeng Cui, Wenjun Huo, Linlu Qiu, Likang Zhao, Junjie Wang, Fei Lou, Shuaiyi Zhang, Vladislav Khayrudinov, Wing Yim Tam, Harri Lipsanen, He Yang, Xia Wang
Gallium arsenide (GaAs) semiconductor wires have emerged as potent candidates for nonlinear optical devices, necessitating bandgap engineering for an expanded operational wavelength range. We report the successful growth of strain-mediated GaAs microwires (MWs) with an average diameter of 1.1 μm. The axial tensile strain in these wires, as measured by X-ray diffraction and Raman scattering, ranges
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Efficient second-harmonic generation of quasi-bound states in the continuum in lithium niobate thin film enhanced by Bloch surface waves Nanophotonics (IF 7.5) Pub Date : 2024-03-13 Yun Lin, Yong Ye, Ziliang Fang, Bingyu Chen, Haoran Zhang, Tiefeng Yang, Yuming Wei, Yunxia Jin, Fanyu Kong, Gangding Peng, Hongchao Cao, Heyuan Guan, Huihui Lu
Nonlinear optics has generated a wide range of applications in the fields of optical communications, biomedicine, and materials science, with nonlinear conversion efficiency serving as a vital metric for its progress. However, the weak nonlinear response of materials, high optical loss, and inhomogeneous distribution of the light field hamper the improvement of the conversion efficiency. We present
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Simulating photosynthetic energy transport on a photonic network npj Quantum Inform. (IF 7.6) Pub Date : 2024-03-11 Hao Tang, Xiao-Wen Shang, Zi-Yu Shi, Tian-Shen He, Zhen Feng, Tian-Yu Wang, Ruoxi Shi, Hui-Ming Wang, Xi Tan, Xiao-Yun Xu, Yao Wang, Jun Gao, M. S. Kim, Xian-Min Jin
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Preparation of amorphous silicon-doped Y2O3 aerogel enabling nonlinear optical features for ultrafast photonics Nanophotonics (IF 7.5) Pub Date : 2024-03-12 Qingxi Zhao, Hongwei Chu, Zhongben Pan, Benxue Liu, Han Pan, Shengzhi Zhao, Dechun Li
Amorphous aerogels with the microscopic nanoscale three-dimensional meshes provide superb platforms for investigating unique physicochemical properties. In order to enhance the physical, thermal and mechanical performances, one efficient and common approach is integrating diverse functional materials. Herein, we report a simple strategy to fabricate the amorphous silicon doped Y2O3 aerogels with the
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Metrology of frequency comb sources: assessing the coherence, from multimode to mode-locked operation Nanophotonics (IF 7.5) Pub Date : 2024-03-12 Roberto Eramo, Alessia Sorgi, Tecla Gabbrielli, Giacomo Insero, Francesco Cappelli, Luigi Consolino, Paolo De Natale
Since the beginning of this millennium, frequency comb generators have reshaped frequency metrology and related areas. After more than two decades since their first realization, several other ways to generate frequency combs, in any spectral region, have been demonstrated, each way with its peculiar features. This trend has triggered the need to quantitatively assess how close the new comb realizations
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Strongly coupled spins of silicon-vacancy centers inside a nanodiamond with sub-megahertz linewidth Nanophotonics (IF 7.5) Pub Date : 2024-03-12 Marco Klotz, Richard Waltrich, Niklas Lettner, Viatcheslav N. Agafonov, Alexander Kubanek
The search for long-lived quantum memories, which can be efficiently interfaced with flying qubits, is longstanding. One possible solution is to use the electron spin of a color center in diamond to mediate interaction between a long-lived nuclear spin and a photon. Realizing this in a nanodiamond furthermore facilitates the integration into photonic devices and enables the realization of hybrid quantum
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Dry synthesis of bi-layer nanoporous metal films as plasmonic metamaterial Nanophotonics (IF 7.5) Pub Date : 2024-03-12 Vincenzo Caligiuri, Hyunah Kwon, Andrea Griesi, Yurii P. Ivanov, Andrea Schirato, Alessandro Alabastri, Massimo Cuscunà, Gianluca Balestra, Antonio De Luca, Tlek Tapani, Haifeng Lin, Nicolò Maccaferri, Roman Krahne, Giorgio Divitini, Peer Fischer, Denis Garoli
Nanoporous metals are a class of nanostructured materials finding extensive applications in multiple fields thanks to their unique properties attributed to their high surface area and interconnected nanoscale ligaments. They can be prepared following different strategies, but the deposition of an arbitrary pure porous metal is still challenging. Recently, a dry synthesis of nanoporous films based on
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Field-free control and switching of perpendicular magnetization by voltage induced manipulation of RKKY interaction Appl. Phys. Lett. (IF 4.0) Pub Date : 2024-03-12 Bao Xuan Tran, Jae-Hyun Ha, Won-Chang Choi, Seongsoo Yoon, Tae-Hwan Kim, Jung-Il Hong
Voltage control of magnetization offers substantial advantages in energy efficiency for the development of spintronics technology. However, achieving a complete 180° magnetization switching remains as a challenging task since the electric field cannot provide torques to turn the magnetic moment in the ferromagnetic material. To address this challenge, we explore the utilization of synthetic antiferromagnetic
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Magnonic notch filter based on spin wave caustic beams Appl. Phys. Lett. (IF 4.0) Pub Date : 2024-03-12 Mitchell S. Swyt, Lia Compton, Arturo Reyes-Almanza, César L. Ordóñez Romero, Giuseppe Pirruccio, H. J. Jason Liu, Kristen S. Buchanan
Here, we study a magnonic crystal made of low-damping yttrium iron garnet that utilizes pseudo-caustic spin wave beams generated from subwavelength square well features arranged in a two-dimensional array. The lattice symmetry and the angle between the caustic beam propagation direction and the applied magnetic field were tailored to optimize the interaction of spin waves with the engineered defects
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Microstructural changes in GaN and AlN under 950 MeV Au swift heavy ion irradiation Appl. Phys. Lett. (IF 4.0) Pub Date : 2024-03-12 Mahjabin Mahfuz, Farshid Reza, Xingyu Liu, Rongming Chu, Maik Lang, Michael Snure, Xing Wang, Miaomiao Jin
The radiation hardness of GaN-based devices is a critical metric for applications in extreme environments. This study investigates the structural changes in GaN and AlN induced by swift heavy ion (SHI) irradiation, characteristic of space radiation environments. A multilayered GaN/AlN structure is exposed to 950 MeV Au ions at fluences of 1×1012 and 8×1012 ions/cm2. Subsequent post-irradiation characterization
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Acid molecule-assisted high-quality SnO2 transport layer for perovskite solar cells Appl. Phys. Lett. (IF 4.0) Pub Date : 2024-03-12 Junwei Tan, Guanhua Ren, Wenbin Han, Yanyu Deng, Zhuowei Li, Chunyu Liu, Wenbin Guo
The SnO2 electron transport layer (ETL) serves a critical role in perovskite solar cells. However, the oxygen vacancy defects and excess hydroxyl (–OH) groups in SnO2 always lead to degradation of device performance. Herein, we introduce iminodiacetic acid (IDA) to modify the SnO2 ETL, yielding three key advantages: (1) IDA can neutralize excess –OH groups and passivate the defects in SnO2, diminishing
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Machine-learning-assisted modeling of alloy ordering phenomena at the electronic scale through electronegativity Appl. Phys. Lett. (IF 4.0) Pub Date : 2024-03-12 Dingqi Zhao, Xi Jin, Junwei Qiao, Yong Zhang, Peter K. Liaw
Many studies attribute the excellent properties of high-entropy alloys to the ordering-phenomena. It can be known from density functional theory that the macroscopic properties of the system can be described by the electron density. Electronegativity is related to electron density, and models describing ordering can be established based on electronegativity scales through machine learning. In this
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High-fidelity correspondence imaging in complex media with varying thresholds and 1-bit compressive sensing Appl. Phys. Lett. (IF 4.0) Pub Date : 2024-03-12 Zhihan Xu, Qian Song, Wen Chen
Here, we report high-fidelity correspondence imaging (CI) in complex media. By introducing varying thresholds to binarize single-pixel light intensities recorded in complex media, dynamic scaling factors can be eliminated. Then, the binarized light intensities and illumination patterns can be fed into a modified 1-bit compressive sensing algorithm to realize high-fidelity object reconstruction. The
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Dissipative stabilization of high-dimensional GHZ states for neutral atoms Appl. Phys. Lett. (IF 4.0) Pub Date : 2024-03-12 Yue Zhao, Yu-Qing Yang, Weibin Li, Xiao-Qiang Shao
High-dimensional quantum entanglement characterizes the entanglement of quantum systems within a larger Hilbert space, introducing more intricate and complex correlations among the entangled particles' states. The high-dimensional Greenberger–Horne–Zeilinger (GHZ) state, symbolic of this type of entanglement, is of significant importance in various quantum information processing applications. This
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Chiral photon emission from a chiral–achiral perovskite heterostructure Appl. Phys. Lett. (IF 4.0) Pub Date : 2024-03-12 Yang Hu, Ruiwen Chen, Saloni Pendse, Takashi Taniguchi, Kenji Watanabe, Jie Jiang, Lifu Zhang, Ru Jia, Edmund F. Palermo, Esther Wertz, Jian Shi
Chiral semiconductors have been recently suggested as the basic building blocks for the design of chiral optoelectronic and electronic devices for chiral emission and spintronics. Herein, we report that through the formation of a chiral/achiral heterostructure, one can develop a chiral system that integrates the merits of both chiral and achiral components for developing a demanded chiral emitter.
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Real-time and calibration-free generalized terahertz time-domain spectroscopic ellipsometry Appl. Phys. Lett. (IF 4.0) Pub Date : 2024-03-12 Hao Chen, Kaijie Wang, Xuequan Chen, Guangyou Fang
Spectroscopic ellipsometry is a high-precision and powerful optical characterization technique, which can be categorized into two fundamental types of standard and generalized ellipsometry. The latter can obtain the complete Jones matrix to investigate various anisotropic samples. However, terahertz generalized ellipsometry has traditionally relied on frequency-domain instrumentation, which is limited
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Broadband transmissive polarization rotator by gradiently twisted α -MoO3 Appl. Phys. Lett. (IF 4.0) Pub Date : 2024-03-12 Songyan Hou, Hao Hu, Zhihong Liu, Weichuan Xing, Jincheng Zhang
Polarization engineering has been proven to enhance the capabilities of light manipulation and thus facilitate the development of integrated photonic devices. In this study, we introduce a polarization rotator based on a gradiently twisted α-MoO3 thin film, which works in the mid-infrared range and functions in a transmission mode. To be specific, the proposed device is constructed by gradiently twisted
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Enhanced terahertz high-harmonic generation from high-Q quasi-bound states in the continuum empowered by permittivity-broken metasurface Appl. Phys. Lett. (IF 4.0) Pub Date : 2024-03-12 Guangcheng Sun, Yue Wang, Zijian Cui, Rongbo Xie, Xiaoguang Zhao
The extraordinary emergence of all-dielectric resonant meta-photonics underpinned by high refractive index and low optical loss materials promises a standout platform for unprecedented manipulation and subwavelength control of light. Recent significant breakthroughs in meta-photonics have to do with the exploration of the non-radiative eigenmodes that lie inside the light cone, called the bound states