A5002996742- Topological Materials and Phenomena
- Chalcogenide Semiconductor Thin Films
- Phase-change materials and chalcogenides
- Quantum and electron transport phenomena
- Advanced Thermoelectric Materials and Devices
- Inorganic Chemistry and Materials
- Rare-earth and actinide compounds
- Graphene research and applications
- Iron-based superconductors research
- Magnetic properties of thin films
- Physics of Superconductivity and Magnetism
- Electronic and Structural Properties of Oxides
- Advanced Semiconductor Detectors and Materials
- Advanced Memory and Neural Computing
- Boron and Carbon Nanomaterials Research
- Surface and Thin Film Phenomena
- Quantum Dots Synthesis And Properties
- Transition Metal Oxide Nanomaterials
- 2D Materials and Applications
- Nanowire Synthesis and Applications
University of Southern California
2015-2021
Southern California University for Professional Studies
2020
Los Angeles City College
2020
University of Hong Kong
2012-2015
Hong Kong University of Science and Technology
2012-2015
We have produced ultrathin lead (Pb) nanowires in the 6 nm pores of SBA-15 mesoporous silica substrates by chemical vapor deposition. The form regular and dense arrays. demonstrate that bulk Pb (a type-I superconductor below Tc = 7.2 K with a critical field 800 Oe) can be tailored nanostructuring to become type-II an upper (Hc2) exceeding 15 T signs Cooper pairing 3–4 above Tc. material undergoes crossover from one-dimensional fluctuating superconducting state at high temperatures...
The transition metal carbide superconductor Sc3CoC4 may represent a new benchmark system of quasi-one-dimensional (quasi-1D) superconducting behavior. We investigate the high-quality single crystalline sample by electrical transport experiments. Our data show that goes through complex dimensional crossover below onset Tc 4.5 K. First, quasi-1D fluctuating state with finite resistance forms in [CoC4]∞ ribbons which are embedded Sc matrix this material. At lower temperature, transversal...
Single crystalline p-type CdTe:Sb nanobelts were fabricated using an Au-catalyzed chemical vapor deposition method. Low carrier concentration and low mobility even at high Sb incorporation manifest compensation in the system. From cross examination of temperature-dependent charge transport photoluminescence measurements, two major acceptor levels induced by doping are determined: a shallow level attributed to substitutional dopants without lattice relaxation associated deeper resulted from...
Abstract Despite the fact that GeTe is known to be a very interesting material for applications in thermoelectrics and phase-change memories, knowledge on its low-temperature transport properties only limited. We report phase-coherent phenomena magnetotransport of nanowires. From universal conductance fluctuations measured nanowires with Au contacts, phase-coherence length about 280 nm at 0.5 K determined. The distinct confirmed by observation Aharonov–Bohm type oscillations parallel...
The transition metal carbide superconductor Sc3CoC4 may represent a new benchmark system of quasi-1D superconducting behavior. We investigate the high-quality single crystalline sample by electrical transport experiments. Our data show that goes through complex dimensional crossover below onset Tc 4.5 K. First, fluctuating state with finite resistance forms in CoC4 ribbons which are embedded Sc matrix this material. At lower temperature, transversal Josephson or proximity coupling...
Abstract Nanohybrid superconducting junctions using antimony telluride (Sb 2 Te 3 ) topological insulator nanoribbons and Nb electrodes are fabricated electron beam lithography magnetron sputtering. The effects of bias current, temperature, magnetic field on the transport properties in a four‐terminal measurement configuration investigated. Two features observed. First, formation Josephson weak‐link junction. junction is formed by proximity‐induced areas nanoribbon right underneath inner...
Unique spin–momentum locking in topological surface states of Sb<sub>2</sub>Te<sub>3</sub> nanowires exhibits an unusual symmetry non-local voltage signal.
Scaling information bits to ever smaller dimensions is a dominant drive for technology (IT). Nanostructured phase change material emerges as key player in the current green-IT endeavor with low power consumption, functional modularity and promising scalability. In this work, we present demonstration of microwave AC voltage induced phenomenon at 3 GHz single Sb$_2$Te$_3$ nanowires. The resistance by total 6 - 7 orders magnitude evidenced transition from crystalline metallic amorphous...
In clean tunneling junctions (TJs), the momentum parallel to barrier is conserved in process. We predict that this phenomenon can be observed a TJ between ferromagnet (FM) and topological insulator (TI). The FM possesses spin-polarized electron states, while TI has spin-momentum locked states. probability determined by spin-matrix element these states leads injection of electrons into with finite surface state. Due spin polarization FM, resulting current not isotropic. magnitude calculated...
The momentum and spin of charge carriers in the topological insulators are constrained to be perpendicular each other due strong spin-orbit coupling. We have investigated this unique spin-momentum locking property Sb2Te3 insulator nanowires by injecting spin-polarized electrons through magnetic tunnel junction electrodes. Non-local voltage measurements exhibit a symmetry with respect field applied nanowire channel, which is remarkably different from that non-local measurement channel lacks...