Epitaxially regrown electrically pumped photonic crystal surface emitting lasers (PCSEL) emitting near 2 and 2.6 µm have been designed, fabricated, and characterized. A high-index-contrast photonic crystal layer was incorporated into the GaSb-based laser heterostructure by air-hole-retaining epitaxial regrowth. A square lattice of triangular holes was etched in the top waveguide core layer of the incomplete

It is shown by the method of molecular dynamics using a chain model that a multilayer packaging of identical single-walled carbon nanotubes with a diameter of D>2.5 nm located on a flat substrate is a multistable system. The system has many stationary states, which are characterized by the portion of collapsed nanotubes. The thickness of the package monotonically decreases with an increase in the portion

Polarization oscillation under GHz electric-field stimuli is a key issue for the future development of ultrafast sensor devices. An ultrafast phase-field model was developed to study the phase diagram of polarization oscillation under sub-GHz electric field for Pb(Zr,Ti)O3. At the morphotropic phase boundary region, the polarization and strain oscillation show maximum amplitude (electric field stimuli

We have studied the magnetic and critical properties of a TeBr4 transported Cr1/3NbS1.86 single crystal using magnetic susceptibility X(T) and isothermal magnetization M(H) measurements. A para- to ferro- magnetic phase transition temperature (T C ) is determined to be 56 K from X(T) and Arrott-Noakes plot. At high temperatures (T ≥ 85 K), X(T) is well captured by the Curie-Weiss law and the effective

We present experimental data on the rapid (∽ 4.4 nm/s) axial growth rate of narrow (∽ 9 nm in radius) InAs nanowires obtained by Au-catalyzed molecular beam epitaxy on Si substrates at a low surface temperature of 270 oC.These nanowires exhibit pure wurtzite crystal structure and an unusually high ratio of the average nanowire length over the effective thickness of deposited InAs of about 60 despite

Oxide semiconductors are considered one of the most promising candidates for back-end-of-line transistors for monolithic three-dimensional integration due to various advantages, such as complementary metal oxide semiconductor (CMOS) compatible method, low fabrication temperature, and promising electrical characteristics. As such, the demand for p-type oxide semiconductors that are comparable to their

Coherent frequency conversions by using multiband topological edge states in photonic structures made of nonlinear optical materials have been extensively investigated. In practice, however, coherent sources localized at the subwavelength scale are of great importance. This Letter reports efficient second-harmonic generation (SHG) by using dual-band second-order topological corner states. By properly

Several nanometer thick, closed, and epitaxial cobalt(II) oxide films with wurtzite crystal structure (w-CoO) are grown on Au(111) and their structural and electronic properties analyzed. The structural quality of the ( 000 1 ¯ ) oriented, oxygen-terminated and unreconstructed films allow the application of surface-science methods to unravel the properties of this unusual polymorph of CoO and may pave

With its outstanding physical properties, single crystal diamond is the material of choice for future power electronics and quantum devices. The later application field is based on the optical and spin properties of color centers hosted in diamond lattice. Two synthesis methods are currently developed to grow high quality diamond: high pressure and high temperature (HPHT) synthesis and chemical vapor

Janus transition metal dichalcogenides (TMDs), which differ from their conventional counterparts by exhibiting two different layers of chalcogenides and an asymmetric out-of-plane structural configuration, are theorized to exhibit a relatively wide variety of properties. Herein, we investigate the structural, electronic, and optical properties of three Janus Pd-based TMD monolayers (PdSSe, PdSTe, PdSeTe)

Carbon nanotubes (CNTs) are attracting the attention of the scientific community because of their enormous potential in various technologies. A horizontally aligned bundle of CNTs is a nanomaterial with a peculiar structure, the technological characteristics of which can be controlled by changing their geometric parameters. This paper analyzes the evolution of the structure and elastic properties of

The usefulness of nitrogen vacancy (NV) centers in diamond is augmented by a low defect and impurity density in the surrounding host material and applications benefit from the ability to control the position of the NV centers. In this letter, a process to create NV centers on single-crystalline diamond microstructures by chemical vapor deposition (CVD) is presented. Pyramidal structures with {111}

Decreasing the thickness of semiconductors to the few monolayer limit often results in structural relaxation and the appearance of new properties. In this work, we demonstrate the bi-stability of 2ML thick CdTe, where the zinc blende structure of the bulk phase is metastable and the stable (ground) state is represented by an inverted structure with Cd atoms sandwiched by Te planes. The thermodynamic

Silver antimony sulfide(AgSbS2) has been considered a promising photovoltaic absorber material because of its suitable band gap, large absorption coefficient and environmental friendliness. However, the photovoltaic performance of AgSbS2-based solar cells is currently far from expectation and the applications of AgSbS2 are currently limited by the underdeveloped fabrication technology. Herein, an effective

The exciton states in cuprous oxide show a pronounced fine structure splitting associated with the crystal environment and the resulting electronic band structure. High resolution spectroscopy reveals an especially pronounced splitting of the yellow D excitons with one state pushed above any other state with the same principal quantum number. This large splitting offset is related to a strong mixing

Magnetoelectric (ME) switching energy is the most important aspect in the practical application of antiferromagnetic Cr2O3-based perpendicular exchange-coupling heterostructures, but it is not fully understood. This study firstly clarifies the relation between the applied magnetic/electric field and surface spin directions (domain status) as well as the perpendicular exchange bias sign in this system

Hierarchical layered architecture in thermoelectric materials works as an ad hoc methodology for strengthening the unique inherent properties. Here, we demonstrate an excellent thermoelectric behavior in novel 2D copper iodide nanoflakes by compositing with Ti3C2 MXene nanoinclusions. The interlaced architecture of CuI/Ti3C2 composite lifts the electrical conductivity over two orders by efficient charge