Kang L. Wang
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View article: Impact of the Ge-Si interfacial barrier on the temperature-dependent performance of PureGaB Ge-on-Si p <sup>+ </sup>n photodiodes
Impact of the Ge-Si interfacial barrier on the temperature-dependent performance of PureGaB Ge-on-Si p <sup>+ </sup>n photodiodes Open
A temperature-dependent study of the near-infrared (NIR) responsivity of Ge-on-Si photodiodes is presented. The diodes, formed as n-Ge islands within oxide windows on n-Si and capped with Ga and B layers (PureGaB), exhibit low dark current…
View article: Voltage-Controlled Magnetoelectric Devices for Neuromorphic Diffusion Process
Voltage-Controlled Magnetoelectric Devices for Neuromorphic Diffusion Process Open
Stochastic diffusion processes are pervasive in nature, from the seemingly erratic Brownian motion to the complex interactions of synaptically-coupled spiking neurons. Recently, drawing inspiration from Langevin dynamics, neuromorphic diff…
View article: Unraveling the nature of quasi van der Waals Epitaxy of magnetic topological insulators Cr: (BixSb1-x)2Te3 on a GaAs (111) substrate through coherently strained interface
Unraveling the nature of quasi van der Waals Epitaxy of magnetic topological insulators Cr: (BixSb1-x)2Te3 on a GaAs (111) substrate through coherently strained interface Open
Quasi van der Waals Epitaxy (qvdWE) has been realized for decades at the interfaces between 3D and 2D materials or van der Waals materials. The growth of magnetic topological insulators (MTI) Cr: (BixSb1-x)2Te3 (CBST) on GaAs (111) substra…
View article: Unveiling the Anomalous Hall Response of the Magnetic Structure Changes in the Epitaxial MnBi<sub>2</sub>Te<sub>4</sub> Films
Unveiling the Anomalous Hall Response of the Magnetic Structure Changes in the Epitaxial MnBi<sub>2</sub>Te<sub>4</sub> Films Open
Recently discovered as an intrinsic antiferromagnetic topological insulator, MnBi2Te4 has attracted tremendous research interest, as it provides an ideal platform to explore the interplay between topological and magne…
View article: Edge magnetoplasmon dispersion and time-resolved plasmon transport in a quantum anomalous Hall insulator
Edge magnetoplasmon dispersion and time-resolved plasmon transport in a quantum anomalous Hall insulator Open
A quantum anomalous Hall (QAH) insulator breaks reciprocity by combining magnetic polarization and spin-orbit coupling to generate a unidirectional transmission of signals in the absence of an external magnetic field. Such behavior makes Q…
View article: Reentrant quantum anomalous Hall effect in molecular beam epitaxy-grown MnBi2Te4 thin films
Reentrant quantum anomalous Hall effect in molecular beam epitaxy-grown MnBi2Te4 thin films Open
In this study, we investigate intrinsic magnetic topological insulator MnBi2Te4 thin films grown by molecular beam epitaxy. We observe a reentrant quantum anomalous Hall effect when the Fermi energy enters the valance band and magnetic fie…
View article: Tunning the number of chiral edge channels in a fixed quantum anomalous Hall system
Tunning the number of chiral edge channels in a fixed quantum anomalous Hall system Open
Quantum anomalous Hall (QAH) insulators exhibit chiral edge channels characterized by vanishing longitudinal conductance and quantized Hall conductance of Ce2/h, wherein the Chern number C is an integer equal to the number of the parallel …
View article: Current manipulation of Giant tunneling altermagnetic resistance in collinear Antiferromagnetic RuO2/MgO/RuO2 sandwich structure
Current manipulation of Giant tunneling altermagnetic resistance in collinear Antiferromagnetic RuO2/MgO/RuO2 sandwich structure Open
As an emerging non-volatile memory technology, magnetic random access memory (MRAM) has key features and advantages including non-volatility, high speed, endurance, low power consumption and radiation tolerance. Conventional MRAM utilizes …
View article: Spin-flop magnetoresistance in a collinear antiferromagnetic tunnel junction
Spin-flop magnetoresistance in a collinear antiferromagnetic tunnel junction Open
Collinear antiferromagnetic (AFM) materials have unique promise of no stray fields, display ultrafast dynamics, and being robust against perturbation filed which motivates the extensive research of antiferromagnetic spintronics. However, t…
View article: Edge Magnetoplasmon Dispersion and Time-Resolved Plasmon Transport in a Quantum Anomalous Hall Insulator
Edge Magnetoplasmon Dispersion and Time-Resolved Plasmon Transport in a Quantum Anomalous Hall Insulator Open
A quantum anomalous Hall (QAH) insulator breaks reciprocity by combining magnetic polarization and spin-orbit coupling to generate a unidirectional transmission of signals in the absence of an external magnetic field. Such behavior makes Q…
View article: Universal conductance fluctuations in a MnBi$_2$Te$_4$ thin film
Universal conductance fluctuations in a MnBi$_2$Te$_4$ thin film Open
Quantum coherence of electrons can produce striking behaviors in mesoscopic conductors, including weak localization and the Aharonov-Bohm effect. Although magnetic order can also strongly affect transport, the combination of coherence and …
View article: Low-damage electron beam lithography for nanostructures on Bi2Te3-class topological insulator thin films
Low-damage electron beam lithography for nanostructures on Bi2Te3-class topological insulator thin films Open
Nanostructured topological insulators (TIs) have the potential to impact a wide array of condensed matter physics topics, ranging from Majorana physics to spintronics. However, the most common TI materials, the Bi2Se3 family, are easily da…
View article: Pressure tunable quantum anomalous Hall states in a topological antiferromagnet
Pressure tunable quantum anomalous Hall states in a topological antiferromagnet Open
Mechanical modulation of the lattice parameter can modify the electronic structure and manipulate the magnetic coupling of a material without introducing impurities. Inspired by success in pressure-controlled magnetism, we investigate the …
View article: Giant Hall Switching by Surface-State-Mediated Spin-Orbit Torque in a Hard Ferromagnetic Topological Insulator
Giant Hall Switching by Surface-State-Mediated Spin-Orbit Torque in a Hard Ferromagnetic Topological Insulator Open
Topological insulators (TI) and magnetic topological insulators (MTI) can apply highly efficient spin-orbit torque (SOT) and manipulate the magnetization with their unique topological surface states with ultra-high efficiency. Here, we dem…
View article: Implementing microwave impedance microscopy in a dilution refrigerator
Implementing microwave impedance microscopy in a dilution refrigerator Open
We report the implementation of a dilution refrigerator-based scanning microwave impedance microscope with a base temperature of ∼100 mK. The vibration noise of our apparatus with tuning-fork feedback control is as low as 1 nm. Using this …
View article: Magnetization switching of a nearly compensated ferrimagnet by enhanced spin-orbit torque
Magnetization switching of a nearly compensated ferrimagnet by enhanced spin-orbit torque Open
Spin–orbit torques (SOTs) provide an efficient way to electrically manipulate the magnetic order in spintronic devices. Compared with conventional ferromagnetic materials, ferrimagnetic materials have the advantages of antiferromagneticall…
View article: Concurrent Ferromagnetism and Superconductivity in Fe(Te,Se) van der Waals Josephson Junctions
Concurrent Ferromagnetism and Superconductivity in Fe(Te,Se) van der Waals Josephson Junctions Open
Ferromagnetism and superconductivity are two key ingredients to create non-Abelian quasiparticle excitations that are expected as building blocks to construct topological quantum computers. Adversely, ferromagnetism and superconductivity a…
View article: Unidirectional Spin Hall Magnetoresistance in Antiferromagnetic Heterostructures
Unidirectional Spin Hall Magnetoresistance in Antiferromagnetic Heterostructures Open
Unidirectional spin Hall magnetoresistance (USMR) has been widely reported in the heavy metal/ferromagnet bilayer systems. We observe the USMR in Pt/α-Fe_{2}O_{3} bilayers where the α-Fe_{2}O_{3} is an antiferromagnetic (AFM) insulator. Sy…
View article: Signatures of Chiral Superconductivity in Chiral Molecule Intercalated Tantalum Disulfide
Signatures of Chiral Superconductivity in Chiral Molecule Intercalated Tantalum Disulfide Open
Chiral superconductors, a unique class of unconventional superconductors in which the complex superconducting order parameter winds clockwise or counter-clockwise in the momentum space, represent a topologically non-trivial system with dir…
View article: Low-damage electron beam lithography for nanostructures on Bi$_2$Te$_3$-class topological insulator thin films
Low-damage electron beam lithography for nanostructures on Bi$_2$Te$_3$-class topological insulator thin films Open
Nanostructured topological insulators (TIs) have the potential to impact a wide array of condensed matter physics topics, ranging from Majorana physics to spintronics. However, the most common TI materials, the Bi$_2$Se$_3$ family, are eas…
View article: Gas sensor incorporating a porous framework
Gas sensor incorporating a porous framework Open
The disclosure provides sensor for gas sensing including CO.sub.2 gas sensors comprising a porous framework sensing area for binding an analyte gas.
View article: Frequency mixer having ferromagnetic film
Frequency mixer having ferromagnetic film Open
A frequency conversion device, which may include a radiofrequency (RF) mixer device, includes a substrate and a ferromagnetic film disposed over a surface of the substrate. An insulator is disposed over the ferromagnetic film and at least …
View article: Structural tuning magnetism and topology in a magnetic topological insulator
Structural tuning magnetism and topology in a magnetic topological insulator Open
To date, the most widely-studied quantum anomalous Hall insulator (QAHI) platform is achieved by dilute doping of magnetic ions into thin films of the alloyed tetradymite topological insulator (TI) (Bi$_{1-x}$Sb$_x$)$_2$Te$_3$ (BST). In th…
View article: Correction to Topological Surface State Annihilation and Creation in SnTe/Cr<sub><i>x</i></sub>(BiSb)<sub>2–<i>x</i></sub>Te<sub>3</sub> Heterostructures
Correction to Topological Surface State Annihilation and Creation in SnTe/Cr<sub><i>x</i></sub>(BiSb)<sub>2–<i>x</i></sub>Te<sub>3</sub> Heterostructures Open
ADVERTISEMENT RETURN TO ISSUEPREVAddition/CorrectionNEXTORIGINAL ARTICLEThis notice is a correctionCorrection to Topological Surface State Annihilation and Creation in SnTe/Crx(BiSb)2–xTe3 HeterostructuresPeng Deng*Peng DengDepartment of E…
View article: Electric-Field Control of Spin Diffusion Length and Electric-Assisted D’yakonov–Perel’ Mechanism in Ultrathin Heavy Metal and Ferromagnetic Insulator Heterostructure
Electric-Field Control of Spin Diffusion Length and Electric-Assisted D’yakonov–Perel’ Mechanism in Ultrathin Heavy Metal and Ferromagnetic Insulator Heterostructure Open
Electric-field control of spin dynamics is significant for spintronic device applications. Thus far, effectively electric-field control of magnetic order, magnetic damping factor and spin–orbit torque (SOT) has been studied in magnetic mat…
View article: Anomalous Landau quantization in intrinsic magnetic topological insulators
Anomalous Landau quantization in intrinsic magnetic topological insulators Open
The intrinsic magnetic topological insulators, Mn(Bi1-xSbx)2Te4, in their spin-aligned strong field configuration have been identified as a Weyl semimetal with single pair of Weyl nodes1-4. A direct consequence of the Weyl state is the lay…
View article: Unidirectional Spin Hall Magnetoresistance in Antiferromagnetic Heterostructures
Unidirectional Spin Hall Magnetoresistance in Antiferromagnetic Heterostructures Open
Unidirectional spin Hall magnetoresistance (USMR) has been widely reported in the heavy metal / ferromagnet (HM/FM) bilayer systems. We observe the USMR in the Pt/α-Fe2O3 bilayers where the α-Fe2O3 is an antiferromagnetic (AFM) insulator. …
View article: Nanomechanical Characterization of an Antiferromagnetic Topological Insulator
Nanomechanical Characterization of an Antiferromagnetic Topological Insulator Open
The antiferromagnetic topological insulator MnBi2Te4 (MBT) exhibits an ideal platform to study exotic topological phenomena and magnetic properties. The transport signatures of magnetic phase transitions in the MBT family materials have be…
View article: Comprehensive Study of the Current-Induced Spin–Orbit Torque Perpendicular Effective Field in Asymmetric Multilayers
Comprehensive Study of the Current-Induced Spin–Orbit Torque Perpendicular Effective Field in Asymmetric Multilayers Open
The spin–orbit torques (SOTs) in the heavy metal (HM)/ferromagnetic metal (FM) structure hold promise for next-generation low-power and high-density spintronic memory and logic applications. For the SOT switching of a perpendicular magneti…
View article: Chromium-Doped Bismuth Antimony Telluride for Future Quantum Hall Resistance Standards
Chromium-Doped Bismuth Antimony Telluride for Future Quantum Hall Resistance Standards Open
Since 2017, epitaxial graphene has been the base material for the US national standard for resistance. A future avenue of research within electrical metrology is to remove the need for strong magnetic fields, as is currently the case for d…