Applied Physics Letters
Articles in this Issue
Determination of optical losses in AlGaN-based UVC multimode waveguides using monolithic LEDs and detectors on a single chip
We report on the investigation of optical losses in AlGaN-based multimode waveguides in the ultraviolet-C spectral range. The optical losses were measured using a monolithic photonic integrated circui...
Enhanced antibonding coupling enables optical transparency in p-type semiconductors by orbital engineering
Developing high-performance p-type transparent conducting materials (TCMs) remains challenging due to the intrinsic trade-off between a high valence band maximum (VBM), required for efficient acceptor...
Sliding ferroelectricity tunable conventional and anomalous spin Hall effects in bilayer 1T′-WTe2
The spin Hall effect, recognized for its high-speed, low-power, and highly controllable characteristics, is a key enabler for next-generation memory and logic devices. However, a primary challenge lie...
Simultaneous bidirectional rectification and fast photodetection in Ta2NiSe5/ReSe2 heterojunctions via gate voltage regulation
Two-dimensional (2D) van der Waals heterojunctions have attracted tremendous attention due to their excellent electronic and optoelectronic properties. However, conventional unipolar 2D heterostructur...
Structural symmetry and superconducting transport in heteroepitaxial FeSe0.4Te0.6/Bi2Se3 systems
Heteroepitaxial FeSe0.4Te0.6/Bi2Se3 heterostructure thin films were successfully grown on CaF2 substrates by pulsed laser deposition. High-resolution structural analysis reveals that atomically sharp...
Twist-angle-engineered ferroelectric vortex lattice in freestanding BaTiO3 bilayers
Realizing isolated ferroelectric topological states is challenging, as polar vortices typically form continuous, coupled networks. Here, we demonstrate that tuning the twist angle (θ) in freestanding...
Visible-light emission from carbon fiber induced by 159-GHz millimeter-wave irradiation
The direct visualization of millimeter-wave radiation is crucial for the development of radiation sources and their applications. In this study, we experimentally determined the minimum incident energ...
Topological electron and phonon nodal line in superconductor TLS-Mo2Te
The interaction between topological electronic and nontrivial phononic states offers a promising route to superconducting mechanisms, yet material platforms that host both are exceedingly rare. Here,...
Evidence of anomalous vortex Hall effect in a ferromagnet/superconductor heterostructure
The coexistence of superconductivity and ferromagnetism is a fascinating and complex phenomenon in condensed matter physics, as these two states are typically mutually exclusive due to their competing...
High-yield fabrication of monolayer and twisted bilayer freestanding hexagonal boron nitride
Hexagonal boron nitride (h-BN), which supports a uniquely large bandgap, has gained interest in its dielectric properties and as a host for quantum emitters. Resolving the atomic structures of emitter...
Experimental generation and control of Raman solitons via Pearcey–Gaussian pulses
Soliton self-frequency shift (SSFS) in nonlinear optical fibers is a powerful mechanism for broadband and tunable wavelength conversion. Nevertheless, achieving flexible and efficient control over the...
Radiation damage and hardening via supercritical fluid process in Al2O3/ <i>β</i> -Ga2O3 MOSCAPs: Insights from proton, Ta-ion, γ-ray, and neutron irradiation
β-Ga2O3 devices hold great promise for applications in space environments, yet their electrical performance degrades under particle and ray irradiation in a distinct manner. This study systematically...
Position-dependent calibration and frequency stability in on-axis optical transduction of vertical InP nanowire resonators
We present a quantitative framework for on-axis optical transduction of vertical InP nanowire resonators, correlating laser position to signal amplitude, calibration, and frequency stability. Photothe...
He-induced semi-insulating microcolumns for high-voltage leakage current suppression in <i>β</i> -Ga2O3 Schottky barrier diodes
Localized semi-insulating regions in β-Ga2O3 are important for modulating the interfacial electric field and leakage characteristics of high-voltage devices. In this work, a high density of acceptor d...
Illumination-intensity-controlled bipolar photoresponse in <b> <i>α</i> </b> -Ga2O3 nanoarray photoelectrode for edge-enhanced solar-blind imaging
Underwater imaging often suffers from reduced edge contrast due to light attenuation, scattering, and fluctuations in illumination intensity, leading to difficulties in target recognition. Existing so...
Suppression of the DC-IV kink effect in AlGaN/GaN MIS-HEMTs through device topology variation
This work investigates the DC-IV kink effect in AlGaN/GaN high-electron-mobility transistors (HEMTs) through structural variations in the gate–drain access length (Lgd) and the inclusion of gate field...
Electronic structure and its tuning of large-angle twisted monolayer–bilayer graphene
Twisted monolayer–bilayer graphene (tMBG) has recently been demonstrated to be an attractive moiré system due to the presence of wide magic angles and unique topological flatbands. However, despite th...
High-transparency topological-insulator-based Josephson junctions enabled by <i>in situ</i> low-temperature Al growth and wet etching
Proximity-induced superconductivity in topological insulators (TIs) offers a promising platform for realizing Majorana zero modes (MZMs). However, disorder and interdiffusion at the superconductor/TI...
Impact of bias-dependent RS and RD on gm in AlGaN/GaN HEMTs under high-field conditions
In the present study, RS and RD under both low-field and high-field conditions were extracted using mobility calculations that incorporate various scattering mechanisms, including polarization Coulomb...
Crystallinity-guided dual modification of wide bandgap perovskite for efficient four-terminal perovskite/silicon tandem solar cells
Wide-bandgap (WBG) perovskite solar cells (PSCs) are essential top absorbers in perovskite/silicon tandem solar cells. However, their power conversion efficiencies (PCEs) are limited by poor crystalli...
AC response across the metal–insulator transition of YBCO Josephson junctions fabricated with a helium-ion beam
Using focused helium-ion beam irradiation, we fabricated in-plane, high-Tc YBa2Cu3O7−δ Josephson junctions. By varying the dose of the irradiation, we tune the junction barriers from metallic to insul...
Buried dielectric quasi-photonic-crystal surface-emitting lasers
We report a quasi-photonic-crystal surface-emitting laser (QPCSEL) that employs sub-micron, low-index buried dielectric features surrounded by high-index epitaxial semiconductor to form the quasi-phot...
Unified 1D theory and design principles for harmonic electrothermal characterization of nanoscale conductors
Electrothermal characterization based on the third or other harmonics of an ac Joule heating current is widely deployed for the thermal analysis of solid conductors and their environment, including so...
Electrical and optical analysis on effects of low-temperature-grown p-AlGaAs cladding layer in all-MOCVD InAs/GaAs quantum dot laser diodes
In this work, we investigate how low-temperature growth of the p-AlGaAs cladding layer affects the structural and device characteristics of all-metal-organic chemical vapor deposition (MOCVD)-grown In...
Lattice-matched (Al <i>x</i> Sc <i>y</i> Ga1− <i>x</i> − <i>y</i> )2O3/ <b> <i>β</i> </b> -Ga2O3 heterostructures with widely tunable bandgap
Bandgap engineering of β-Ga2O3 is essential for advancing its electronic and optoelectronic applications. However, the growth of high-quality heteroepitaxial structures is often hampered by large latt...