Applied Physics Letters
Articles in this Issue
N-polar AlGaN HEMTs on silicon for reduced contact resistance
Nitrogen-polar (N-polar) AlGaN-channel high electron mobility transistors (HEMTs) offer a promising pathway to overcome the limitations of equivalent metal-polar (M-polar) devices, particularly the hi...
A tunable coincidence counter based on superconducting nanowire cryotrons
Single-photon coincidence counters are essential components in integrated quantum photonics, enabling efficient logic discrimination and real-time error correction at the chip level. However, monolith...
Near-surface-weighted non-equilibrium viscoelastic transitions during mist-CVD growth of amorphous TiO <i>x</i> revealed by dual-frequency quartz crystal microbalance
We demonstrate that the viscoelastic evolution during mist chemical vapor deposition (mist-CVD) of amorphous TiOx (a-TiOx) is governed by near-surface-weighted non-equilibrium transitions rather than...
Investigation on AZO/4H-SiC n-i-p ultraviolet photodiodes with high response via Al-composition engineering
Transparent conductive materials can be employed in advanced ultraviolet (UV) photodetectors for high performance. To fabricate an Al-doped ZnO (AZO)/4H-SiC n-i-p UV photodiode, an ultrathin AZO film...
Correlating carrier concentration and mobility in graphene oxide-doped PEDOT:PSS with electroluminescence efficiency of polymer light-emitting diodes
We report a quantitative decoupling of carrier concentration and mobility in graphene oxide (GO)-doped poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) and identify the dominant tra...
Spatial control of single-photon emitters in gallium nitride via dose-engineered focused ion beam processing
Single-photon emitters (SPEs) in solid-state materials are key components for emerging quantum technologies, but their random spatial distribution and lack of spatial isolation remain major obstacles...
Experimental and numerical demonstration of threshold voltage asymmetry and synaptic plasticity in MoS2 transistors
Thanks to their advanced tunable electrical properties, two-dimensional materials have emerged as a promising platform for neuromorphic computing, offering unique flexibility and scalability. In this...
The equation of state of tantalum to 433 GPa
The volume compression of body-centered cubic tantalum has been measured to 433 GPa in the standard bevel and toroidal diamond anvil cell (DAC) using synchrotron-based angle-dispersive powder x-ray di...
Harnessing Pt/W spin Hall superlattices for efficient field-free spin–orbit torque switching
Spin–orbit torque (SOT) offers a promising route to achieve energy-efficient magnetization switching. However, materials with a perpendicular magnetic anisotropy (PMA) require an external magnetic fie...
Ultra-stable multiple emission wavelengths produced by Tb-doped Al <i>x</i> Ga1− <i>x</i> N-based light-emitting diodes
Tb-doped semiconductors are candidates for novel full-color light sources in next-generation high-definition displays. Particularly, Tb-doped AlxGa1−xN (AlxGa1−xN:Tb) has attracted much attention beca...
Flexoelectric polarization synergy enables ultrafast charge transfer for high-efficiency photoconversion in mixed-dimensional MoS2/WSe2 heterostructures
Transition metal dichalcogenide nanotubes (NTs) and their heterostructures hold promise for advanced photonics, yet the combined role of flexoelectricity and heterointerface electronegativity mismatch...
Photoluminescence-based ultrasensitive DNA detection of typhoid using MgO nanomaterials
An ultrasensitive optical DNA biosensor based on magnesium oxide (MgO) nanoparticles is reported for the detection of Salmonella typhimurium. The sensing mechanism relies on photoluminescence (PL) mod...
Super-resolution phenomenon induced by surface spin-wave diffraction through a hole in in-plane magnetized YIG film
Diffraction of a surface spin wave by a through hole formed inside the in-plane magnetized yttrium iron garnet (YIG) film is investigated both experimentally and theoretically for the case where the h...
Verification of 100 nm resolution in a superconducting nanostrip single-photon detector for hard x-ray image reconstruction
We propose a method using a superconducting nanostrip single-photon detector (SNSPD) that can significantly reduce resolution compared with conventional imaging detectors. An SNSPD is advantageous for...
Low-droop and high-efficiency (&gt;40%) UVA emitters enabled by precursor modulated quantum wells
We demonstrate a precursor-modulation growth scheme to overcome the efficiency limitations of ultraviolet-A (UVA) light emitting diodes (LEDs) caused by interface intermixing and poor carrier confinem...
Sign reversal of current-induced torque in perpendicularly magnetized Pd/Co2MnGa and Pd/Co2MnSi
We studied the effective magnetic field Heff arising from the spin–orbit torque (SOT) and/or orbital torque (OT) by measuring shifts of out-of-plane hysteresis loops under various in-plane currents Is...
Reconfigurable WSe2 transistors enabled by complementary electrostatic shielding of source and drain electrodes
Reconfigurable field-effect transistors (RFETs) based on ambipolar two-dimensional (2D) semiconductors provide a versatile platform for multifunctional logic and neuromorphic computing. Traditional RF...
Short-term forgetting at ultrafast timescales emulated by the depression function of a VCSOA-based photonic synapse
Forgetting, an active optimization mechanism in the human brain, is governed by synaptic plasticity. This insight has motivated the development of artificial synapses for hardware-level emulation of f...
Polarization-sensitive metasurfaces for tunable structural colors with HSB control
Plasmonic metasurfaces can achieve static structural colors with high resolution, high efficiency, high saturation, and a wide color gamut. Integrating phase change materials and electro-optical compo...
Low thermal conductivity and thermal boundary conductance in BiOI crystals and films grown at low temperature
We present measurements of thermal conductivity and thermal boundary conductance (TBC) in the layered crystal BiOI. These measurements are applied to bulk crystals and crystalline films grown at low t...
Toward in-line monitoring of the microstructure of organic semiconductor materials for photovoltaic applications via spectroscopic ellipsometry
High-throughput (HT) and automated fabrication methodologies are transforming the development of thin film organic optoelectronic devices. Organic semiconductor materials typically exhibit morphology-...
Substrate-dependent electrical transport in individual single-walled carbon nanotubes grown across SiO2 and hexagonal boron nitride
The electronic transport properties of carbon nanotubes (CNTs) are strongly affected by their surrounding environment, making the underlying substrate a critical factor for device performance. Here, w...
Large topological Hall effect in epitaxial NiFeMo/NiFeMoO films with low-temperature exchange bias
We demonstrate exchange bias-driven large topological Hall effect in epitaxial NiFeMo/NiFeMoO heterostructures fabricated on Al2O3 (0001) substrates. Structural analyses confirm high-quality epitaxial...
The effect of demagnetization on the susceptibility of single-domain particles and assemblies
According to the classical laws of magnetism, the shape of magnetically soft objects limits the effective susceptibility. For example, spherical soft magnets cannot display an effective susceptibility...
Mn-doping with reduced carry-over effect in semi-insulating GaN grown by MOCVD
Semi-insulating GaN layers for high-electron mobility transistors (HEMTs) used in radio frequency applications are typically achieved through Fe-doping, despite its known adverse effects on transport...