The results of the theoretical and experimental investigations of optical response of the acceptor centers in narrow GaAs/AlGaAs quantum wells in the infrared spectral range are presented. In the theoretical part, we focused on the probabilities of the photoionization of acceptor centers taking into account the complicated valence band structure and intermixing the light and heavy hole states. We used

Strain engineering is one of the most efficient methods to continuously modulate the physical properties of materials. In this paper, the thermal conductivity of blue phosphorene with biaxial tensile strain is systematically investigated by means of phonon Boltzmann transport equation based on first-principles calculations. The results show that the thermal conductivity of blue phosphorene increases

Despite the wide employment of transient absorption spectroscopy in capturing fast-evolving dynamics, the experiments lack further exploration of macroscopic effects beyond the single-atom response. Here, the absorbance of Rb atoms excited and coupled by two near-infrared pulses with a variable interpulse delay is studied both experimentally and theoretically, from the limit of a dilute-gas medium

We observed the dynamical evolution of the electron–nuclear wavepacket composed of the ##IMG## [http://ej.iop.org/images/0953-4075/53/16/164001/bab94ccieqn2.gif] {${B}^{2}{{\Sigma}}_{\text{g}}^{-}$} and 3 2 Π u states of ##IMG## [http://ej.iop.org/images/0953-4075/53/16/164001/bab94ccieqn3.gif] {${\mathrm{O}}_{2}^{+}$} with an evolution period of 1.3 fs. We created a dissociative wavepacket of ##IMG##

Using quantum-mechanical, one-dimensional, non-Born–Oppenheimer simulations we study the control over the strong-field dynamics of the helium hydride molecular ion HeH + due to interaction driven by short and strong two-color laser pulses. We calculate yields of two competing fragmentation channels: electron removal and dissociation. We find that by changing the relative phase of the two colors, we

In this work we investigate the interaction of aniline in the gas phase with 50 fs pulses of radiation at a wavelength of 800 nm. Ion yields were measured using a reflectron time-of-flight mass spectrometer that avoids spatial averaging by collecting ion from a micrometer-sized volume within the focal region. This measuring technique allows for accurate measurements and quantification of relative ion

##IMG## [http://ej.iop.org/images/0953-4075/53/17/174002/bab9999ieqn1.gif] {${\mathrm{H}}_{2}^{+}$} exposed to strong mid-infrared laser pulses undergoes the tunneling ionization, followed by the rescattering of the photoelectron with the parent ion. The two nuclei repel each other during the tunneling and rescattering, which modifies the Coulomb potential experienced by the rescattering electron.

In a strong electric field, a dipolar molecule will contract or expand and, in extreme cases, dissociate. Considering a two-atomic non-rigid dipole described by the realistic Kratzer model, we compute analytical energy corrections up to fourth order in the field strength for general states and ninth order for the ground state. The fourth-order series is subsequently ‘resummed’ using the hypergeometric

We report on a measurement of several n = 3 → n = 2 inner-shell transitions in sodiumlike, magnesiumlike, and aluminumlike europium, performed at the EBIT-I electron beam ion trap facility at the Lawrence Livermore National Laboratory using an x-ray calorimeter. Although the inner-shell x-ray lines of such M-shell ions are typically dominated by electric dipole allowed transitions, we have also identified

We consider a two-dimensional self-bound quantum droplet, which consists of a mixture of two Bose–Einstein condensates. We start with the ground state and then turn to the rotational response of this system, in the presence of an external (harmonic) potential. We identify various phases, depending on the atom number, the strength of the external confinement and the angular momentum. These include center

The amount of ionization produced in a laser-matter interaction provides critical information in studying strong field physics and attosecond science. The amount of ionization can be accurately measured in vacuum using a photoelectron/ion spectrometer by counting the number of charged particles. However, an ionization yield measurement in ambient air requires the considerations of post processes such

Recently, we have demonstrated (Jin et al 2020 J. Phys. B: At. Mol. Opt. Phys. 53 075201) that a hybrid subconfiguration-average and level-to-level distorted wave treatment of electron-impact single ionisation (EISI) of W 14+ ions represents an accurate and manageable approach for the calculation of EISI cross sections of a complex ion. Here we demonstrate the more general validity of this approach

Nonclassicality of a single-mode state can be quantified by the entanglement (potential) the state creates at the output of a beam splitter. Thus, beam splitter transformation can be utilized for obtaining single-mode nonclassicality conditions (quantifications) from two-mode entanglement criteria (measures). Here, (i) we employ this relation to quantify the single-mode nonclassicality (SMNc) of a

This work examines the reflectivity and transmissivity of a TE‐polarized wave incident on a microcavity containing strongly coupled excitons with in‐plane uniaxially oriented transition dipole moments and presents a different interpretation to a previous report. The propagation of the electric field inside the cavity is discussed and a distinction is made between two different physical cases: the first

In this paper sputter deposited ferromagnetic Weyl semimetal and full‐Heusler compound Co2TiGe is investigated. Crystal quality is analyzed using X‐Ray diffraction and reflectivity. Additionally, temperature dependent transport and magnetization measurements are performed. The sample shows indications on the formation of L21 crystal structure. Magnetization measurements show a saturation magnetization

We have proposed Bayesian spectroscopy technique in order to decompose weak pre‐edge structures from an X‐ray absorption near edge structure (XANES) spectrum. This methodology can perform model selection based on an information criterion of Bayes free energy. To explain the entire XANES spectrum measured at Fe K‐edge of α‐Fe2O3 with a partial fluorescence yield method, we have introduced a phenomenological

Surfaces of soft solids can have significant surface stress, extensional modulus and bending stiffness. Previous theoretical studies have usually examined cases in which both the surface stress and bending stiffness are constant, assuming small deformation. In this work we consider a general formulation in which the surface can support large deformation and carry both surface stresses and surface bending

A new approach is presented in order to check whether the hypothesis of an Arrhenius component surviving in the α-relaxation region, is consistent with experimental data. The temperature dependence of the dynamics in the glassy regime is described by an equation which assumes an Arrhenius component in the cooperative diffusion. Based on thermodynamic arguments, the dynamic heterogeneities close to

Correction for ‘Dynamical self-assembly of dipolar active Brownian particles in two dimensions’ by Guo-Jun Liao et al., Soft Matter, 2020, 16, 2208–2223, DOI: 10.1039/C9SM01539F.

Complexation of a lipid-based ionizable cationic molecule (referred to as DML: see main text) with RNA in an aqueous media, was examined in detail by means of fully atomistic molecular dynamics simulations. The different stages of the DML-RNA association process were explored, while the structural characteristics of the final complex were described. The self-assembly process of the DML molecules was

Many bent-core nematic liquid crystals exhibit unusual physical properties due to the presence of smectic clusters, known as “cybotactic” clusters in the nematic phase. Here, we investigate the effect of these clusters on complex shear modulus (G∗(ω)) of two asymmetric bent-core liquid crystals using microrheology technique. Compound with shorter hydrocarbon chain (8OCH3) exhibit only nematic (N) phase

The non-linear viscoelastic response under interrupted shear flows is one of the interesting characteristics of entangled polymers. In particular, the stress overshoot in the resumed shear has been discussed concerning the recovery of the entanglement network in some studies. In this study, we performed multichain slip-link simulations to observe the molecular structure of an entangled polymer melt

The calculation of the transfer matrix for a large non-periodic multilayered system may become unstable in the presence of absorption. We discuss the origin of this instability and we explore two methods to overcome it: the use of a total matrix to solve for all the fields at all the interfaces simultaneously and an expansion in the Bloch-like modes of a periodic artificially repeated system. We apply

At atmospheric pressure, dielectric barrier discharge of a mixture of nitrogen gas and n-hexane solution has been used to deposit N-DLC films on Pyrex glasses. The composition and the structure of the deposited films have been studied by FTIR and Raman spectra. The surface morphology of films is performed by analyses of FESEM, EDX, and AFM. According to the results of Raman spectra, the ID/IG ratio

The combined influence of temperature, hydrostatic pressure, and applied aluminum concentration on the magneto-optical properties of GaAs/AlμGa1−μAs quantum wells (QWs) is presented by considering the combined influences of them on the magnetophonon resonance absorption power (AP) and the full width at half maximum (FWHM) of the optically detected magneto-phonon resonance (ODMPR) peaks for both phonon

AlGaN based Nanowire laser diodes (NW-LDs) grown on sapphire substrates have strong polarization induced electric field. Such electric field has the ability to degrade the optoelectronic characteristics of deep ultraviolet (DUV) NW-LD. In this work, a graded AlN composition AlxGa1-xN waveguide (WG) layer is used for the enhancement of DUV NW-LD performance. Grading of WG induces bulk polarization charges

The possibilities of employing InAs sub-mono layer (SML) quantum dots (QD) as long wavelength sources and infrared photodetectors have been explored in this work. To accomplish this, various heterostructures based on InAs SML QDs capped with GaAs1-xSbx were studied. The effects of Sb accumulation on the top of QDs were explored and their influences on the optical properties were duly explained. Two

The role of the nature of confinement on a neutral hydrogenic donor impurity in a quantum dot is studied using a power-exponential potential in the presence of Rashba and Dresselhaus spin-orbit interactions and an external magnetic field. The ground state energy is calculated variationally and the corresponding binding energy, magnetic moment and susceptibility are obtained as a function of various

We show that the magnetic response of atomically thin materials with Dirac spectrum and spin-orbit interactions can exhibit strong dependence on electron-electron interactions. While graphene itself has a very small spin-orbit coupling, various two-dimensional (2D) compounds “beyond graphene’’ are good candidates to exhibit the strong interplay between spin-orbit and Coulomb interactions. Materials

Mn-based antiperovskite compounds in the form Mn3AX, where A is a main group element and X is C or N, undergo magnetostructural transitions with which these materials acquire magnetocaloric, giant magnetoresistance and spin-transport properties, which can be modified or tailored by manipulating the compositions of numerous compounds. This enables closer investigations and better understandings of the

Recent experiments on semiconductor quantum dots have demonstrated the ability to utilize a large quantum dot to mediate superexchange interactions and generate entanglement between distant spins. This opens up a possible mechanism for selectively coupling pairs of remote spins in a larger network of quantum dots. Taking advantage of this opportunity requires a deeper understanding of how to control

The magnetic-order induced effects in nanocrystalline NiO are investigated through the phonons and magnons observed in the Raman spectra The key observations are (i) an anisotropy of the first-order transverse and longitudinal optical phonons, with a splitting of the order of 5 meV and (ii) a marked size and excitation wavelength variation of the two- magnon (2M) peak, which varies linearly with a

The Weyl semimetal NbP exhibits a very small Fermi surface consisting of two electron and two hole pockets, whose fourfold degeneracy in k space is tied to the rotational symmetry of the underlying tetragonal crystal lattice. By applying uniaxial stress, the crystal symmetry can be reduced, which successively leads to a degeneracy lifting of the Fermi-surface pockets. This is reflected by a splitting

We investigate the variation of charge dynamics in the course of the filling-control metal-insulator transitions (MITs) for pyrochlore (R being rare-earth ions). With widely changing of R ions from Lu to Pr, the antiferromagnetic transition temperature systematically increases while the magnitude of the charge gap decreases toward zero at the hypothetical bandwidth-control Mott transition. It is attributable

In this paper, we explore the decoherence dynamics of a probing spin coupled to a spin bath, where the spin bath is given by a controllable 1D transverse-field Ising chain. The 1D transverse-field Ising chain with free-ends boundary condition is equivalent to a modified Kitaev model with non-local Majorana bound states in its topological phase. We find that the non-Markovian decoherence dynamics of

Weakly coupled Ising chains provide a condensed-matter realization of confinement. In these systems, kinks and antikinks bind into mesons due to an attractive interaction potential that increases linearly with the distance between the particles. While single mesons have been directly observed in experiments, the role of the multiparticle continuum and bound states of mesons in the excitation spectrum

We investigate few- and many-body states in half-filled maximally symmetric topological insulator flat bands realized by two degenerate Landau levels which experience opposite magnetic fields. This serves as a toy model of flat bands in moir'e materials in which valleys have Chern numbers C=±1. We argue that although the spontaneously polarized Ising Chern magnet is a natural ground state for repulsive

Motivated by the recently observed insulating states in twisted bilayer graphene (TBG), we study the nature of the correlated insulating phases of the TBG at commensurate filling fractions. We use the continuum model and project the Coulomb interaction onto the flat bands to study the ground states by using a Hartree-Fock approximation. In the absence of the hexagonal boron nitride (hBN) substrate

The generic phase diagram of lightly hole-doped high-Tc-cuprates hosts antiferromagnetic insulating phase with well-defined spin-wave excitations. Contrary to the weak-coupling prediction, these modes persist up to the overdoped metallic regime as intense and dispersive paramagnons. Here we report on our study of the low-energy magnetic and charge excitations within the extended Hubbard model at strong-coupling

The gap modulation is an intriguing feature of the single-layer black phosphorene (BP) in optoelectronics. In this paper, the uniaxial and biaxial strain effects are systematically investigated to tailor the band gap, Fermi velocity, and effective mass along both armchair (AC) and zigzag (ZZ) directions in BP. The tight-binding model and the Harrison rule propose the electronic phase transitions. In

Hydrogels, as a kind of soft materials, are good candidates for smart skin-like materials. Double network is usually fabricated to improve the mechanical properties of hydrogels, which needs two different kinds of networks. In this work, a novel strategy of preparing single network double cross-linkers (SNDCL) hydrogels was proposed and the prepared hydrogels possess excellent mechanical properties

We report observations of photopolymerization driven phase-separation in a mixture of a photo-reactive monomer and inorganic nanoparticles. The mixture is irradiated with visible light possessing a periodic intensity profile that elicits photopolymerization along the depth of the mixture, establishing a competition between photo-crosslinking and thermodynamically favorable phase-separating behavior

We herein report the construction of peroxidase (POD)-mimicking catalysts based on the strategy of peptide assembly and molecular imprinting. Upon the co-assembly of Fmoc-FFH and hemin, we firstly fabricated the CA-H/Hemin which displayed POD-like catalytic activity and showed a 21-fold rate acceleration in the oxidation of 2,2'-Azinobis-(3-ethylbenzthiazoline-6-sulphonate) (ABTS) than the uncatalyzed

It is shown that electron tunneling through a potential barrier that separates two quantum dots of germanium leads to the splitting of electron states localized over spherical interfaces (a quantum dot – a silicon matrix). The dependence of the splitting values of the electron levels on the parameters of the nanosystem (the radius a quantum dot germanium, as well as the distance D between the surfaces

The paper presents the results of irradiation treatment by the 180 fs laser pulses at the wavelength of 1030 nm of Ge2Sb2Te5 amorphous thin films. It is shown that the high quality laser‐induced periodic surface structures (LIPSS) are formed at certain parameters of irradiation with a period corresponding to the laser wavelength. A distinctive feature of the observed LIPSS is the alternation of amorphous

One of the challenging tasks of ZnO is to make its p-type doping stable. However, the physical mechanism behind the experimental phenomena of stable ZnO p-type has not been explored so far. Here, the first-principles calculations using the GPW and FP-LPAW methods within Density Functional Theory (DFT) were investigated to explore, on one side, the effect of different substitutional and interstitial