A5019378283- Topological Materials and Phenomena
- Quantum and electron transport phenomena
- Graphene research and applications
- Surface Modification and Superhydrophobicity
- Electronic and Structural Properties of Oxides
- Advanced Sensor and Energy Harvesting Materials
- Physics of Superconductivity and Magnetism
- Photonic and Optical Devices
- Advanced Condensed Matter Physics
- Advanced Fiber Laser Technologies
- Semiconductor Quantum Structures and Devices
- Plasmonic and Surface Plasmon Research
- Surface and Thin Film Phenomena
- Transportation Planning and Optimization
- Transition Metal Oxide Nanomaterials
- Advancements in Semiconductor Devices and Circuit Design
- Advanced Fiber Optic Sensors
- Adhesion, Friction, and Surface Interactions
- Semiconductor materials and devices
- Traffic Prediction and Management Techniques
- Ferroelectric and Piezoelectric Materials
- Polymer composites and self-healing
- Ecosystem dynamics and resilience
- Aerogels and thermal insulation
- Photonic Crystals and Applications
Southwest Jiaotong University
2024
Nankai University
2008-2024
Collaborative Innovation Center of Chemical Science and Engineering Tianjin
2024
Chinese Academy of Sciences
2010-2024
Institute of Zoology
2024
Institute of Hydrobiology
2020-2024
Mianyang Normal University
2022-2024
Collaborative Innovation Center of Advanced Microstructures
2024
Nanjing University
2024
University of Pittsburgh
2008-2023
We report that Bi₂Se₃ thin films can be epitaxially grown on SrTiO₃ substrates, which allow for very large tunablity in carrier density with a back gate. The observed low field magnetoconductivity due to weak antilocalization (WAL) has gate-voltage dependence unless the electron is reduced values. Such transition WAL correlated unusual changes longitudinal and Hall resistivities. Our results suggest much suppressed bulk conductivity at negative gate voltages possible role of surface states phenomena.
A monolithic 3D hybrid of graphene and carbon nanotube was synthesized by two-step chemical vapor deposition. Owing to its superhydrophobic superoleophilic properties, it can selectively remove oils organic solvents from water with high absorption capacity good recyclability.
We demonstrate that the weak antilocalization effect can serve as a convenient method for detecting decoupled surface transport in topological insulator thin films. In regime where bulk Fermi coexists with states, low-field magnetoconductivity is well described by Hikami-Larkin-Nagaoka equation single-component of noninteracting electrons. When electron density lowered, magnetotransport behavior deviates from description and strong evidence found independent conducting channels at or near...
Topological superconductors can host Majorana quasiparticles which supersede the fermion/boson dichotomy and offer a pathway to fault tolerant quantum computation. In one-dimensional systems zero-energy states are bound ends of topologically superconducting regions. An experimental signature state is conductance peak at zero source-drain voltage bias in tunneling experiment. Here, we identify bulk topological phase semiconductor nanowire coupled conventional superconductor. We map out its...
We perform tunneling measurements on indium antimonide nanowire/superconductor hybrid devices fabricated for the studies of Majorana bound states. At finite magnetic field, resonances that strongly resemble states, including zero-bias pinning, become common to point ubiquity. Since states are predicted in only a limited parameter range nanowire devices, we seek an alternative explanation observed peaks. With help self-consistent Poission-Schr\"odinger multiband model developed parallel,...
Abstract The growth of high quality, gate‐tunable topological insulator Bi 2 Se 3 thin films on SrTiO substrates by molecular beam epitaxy is reported in this paper. optimized substrate preparation procedures are critical for obtaining undoped with sufficiently low carrier densities while maintaining the strong dielectric strength substrates. large tunability chemical potential manifested greatly enhanced longitudinal resistivity and reversal sign Hall at negative back‐gate voltages. These...
Recent tunneling conductance measurements on semiconductor-superconductor nanowires find zero-bias peaks to be ubiquitous across wide ranges of chemical potential and Zeeman energy J. Chen et al., Phys. Rev. Lett. 123, 107703 (2019). Motivated by this, we demonstrate that topologically trivial Andreev abound states (ABSs) pinned near zero are produced rather generically in inhomogeneous systems with multiband occupancy the presence interband coupling. We first investigate coupling mechanism...
Abstract Single-atom magnetism switching is a key technique towards the ultimate data storage density of computer hard disks and has been conceptually realized by leveraging spin bistability magnetic atom under scanning tunnelling microscope. However, it rarely applied to solid-state transistors, an advancement that would be highly desirable for enabling various applications. Here, we demonstrate realization electrically controlled Zeeman effect in Dy@C 84 single-molecule thus revealing...
Majarona fermions (MFs) were predicted more than seven decades ago but are yet to be identified [1]. Recently, much attention has been paid search for MFs in condensed matter systems [2-10]. One of the seaching schemes is create MF at interface between an s-wave superconductor (SC) and a 3D topological insulator (TI) [11-13]. Experimentally, progresses have achieved observations proximity-effect-induced supercurrent [14-16], perfect Andreev reflection [17] conductance peak Fermi level [18]....
Abstract Catastrophic regime shifts in various ecosystems are increasing with the intensification of anthropogenic pressures. Understanding and predicting critical transitions thus a key challenge ecology. Previous studies have mainly focused on single environmental drivers (e.g. eutrophication) early warning signals (EWSs) prior to population collapse. However, how multiple stressors interact shape ecological behaviour whether EWSs were detectable recovery process lake largely unknown. We...
A micromachined thermal accelerometer that is simple, reliable, and inexpensive to make has been developed at Simon Fraser University. The operating principle of this based on the free-convection heat transfer a small hot air bubble in sealed chamber. An experimental device requires only four masking steps fabricate built. This demonstrated 0.6 milli-g sensitivity can theoretically be extended sub-micro-g level: 2-axis same also fabricated tested.
We have investigated the conductance spectra of Sn-Bi2Se3 interface junctions down to 250 mK and in different magnetic fields. A number anomalies were observed below superconducting transition temperature Sn, including a small gap from that zero-bias peak growing up at lower temperatures. discussed possible origins smaller peak. These phenomena support proximity-effect-induced chiral phase is formed between Sn strong spin-orbit coupling material Bi2Se3.
Junctions created by coupling two superconductors via a semiconductor nanowire in the presence of high magnetic fields are basis for potential detection, fusion, and braiding Majorana bound states. We study $\mathrm{NbTiN}/\mathrm{InSb}$ $\text{nanowire}/\mathrm{NbTiN}$ Josephson junctions find that dependence critical current on field exhibits gate-tunable nodes. This is contrast with well-known Fraunhofer effect, under which nodes form regular pattern period fixed junction area. Based...
The so-called interlayer-sliding ferroelectricity was recently proposed as an unconventional route to pursuit electric polarity in van der Waals multi-layers, which already experimentally confirmed WTe$_2$ bilayer even though it is metallic. Very recently, another system, i.e., the ZrI$_2$ bilayer, predicted exhibit with both in-plane and out-of-plane polarizations [Phys. Rev. B \textbf{103}, 165420 (2021)]. Here bulk studied, owns two competitive phases ($\alpha$ \textit{vs} $\beta$), of...
We have studied the electron transport properties of topological insulator-related material Bi${}_{2}$Se${}_{3}$ near superconducting Pb-Bi${}_{2}$Se${}_{3}$ interface, and found that a state is induced over an extended volume in Bi${}_{2}$Se${}_{3}$. This can carry Josephson supercurrent, demonstrates gaplike structure conductance spectra as probed by normal-metal electrode. The establishment gap not confining electrons into narrow space close to superconductor-normal metal previously...
We investigate an electron transport blockade regime in which a spin triplet localized the path of current is forbidden from entering spin-singlet superconductor. To stabilize triplet, double quantum dot created electrostatically near superconducting Al lead InAs nanowire. The closest to normal exhibits Coulomb diamonds, and Andreev bound states induced gap. experimental observations compare favorably theoretical model blockade, named so because configuration suppresses reflections. Observed...
<p>Ecological resilience is critical for ecosystems to persist in the face of perturbations without shifting a different state. Global biodiversity loss multiple considered be associated with decreasing ecological and increasing risk ecosystem collapse. However, how temporal changes affect natural remains poorly elucidated. By analyzing subfossil records diatoms, chironomids, cladocerans from 53 lake sediment cores across globe, we found that species richness showed an trend time,...
The fractional quantized Hall state (FQHS) at the filling factor ν = 5/2 is of special interest due to its possible application for quantum computing.Here we report on optimization growth parameters that allowed us produce two-dimensional electron gases (2DEGs) with a gap energy up 135 mK.We concentrated optimizing MBE provide high energies in "as-grown" samples, without need enhance 2DEG´s properties by illumination or gating techniques.Our findings allow analyse impact doping narrow wells...
Unidirectionally propagated electromagnetic waves are rare in nature but heavily sought after due to their potential applications backscatter-free optical information processing setups. It was theoretically shown that the distinct bulk band topologies of a gyrotropic metal and an isotropic can enable topologically protected unidirectional surface plasmon polaritons (SPPs) at interface. Here, we experimentally identify such interfacial modes terahertz frequencies. Launching SPPs via tailored...