A5033855524- Advanced Condensed Matter Physics
- Physics of Superconductivity and Magnetism
- Topological Materials and Phenomena
- Quantum and electron transport phenomena
- Quantum many-body systems
- Magnetic and transport properties of perovskites and related materials
- Iron-based superconductors research
- Graphene research and applications
- Electronic and Structural Properties of Oxides
- Integrated Energy Systems Optimization
- Magnetic properties of thin films
- Building Energy and Comfort Optimization
- Semiconductor materials and devices
- Rare-earth and actinide compounds
- Organic and Molecular Conductors Research
- Theoretical and Computational Physics
- Cold Atom Physics and Bose-Einstein Condensates
- Semiconductor materials and interfaces
- Smart Grid Energy Management
- Magnetism in coordination complexes
- Corporate Taxation and Avoidance
- Surface and Thin Film Phenomena
- 2D Materials and Applications
- Atomic and Subatomic Physics Research
- Carbon Nanotubes in Composites
Chinese Academy of Sciences
2019-2025
University of Chinese Academy of Sciences
2018-2025
Songshan Lake Materials Laboratory
2020-2025
Czech Academy of Sciences, Institute of Physics
2020-2025
China Jiliang University
2025
Zhejiang University
2013-2024
Institute of Physics
2019-2024
Kavli Institute for Theoretical Sciences
2018-2024
Shanghai Advanced Research Institute
2024
National Laboratory for Superconductivity
2019-2023
This article is an introductory review of the physics quantum spin liquid (QSL) states. Quantum magnetism a rapidly evolving field, and recent developments reveal that ground states low-energy frustrated systems may develop many exotic behaviors once we leave regime semi-classical approaches. The purpose this to introduce these developments. begins by explaining how approaches fail mechanics become important then describes alternative for addressing problem. We discuss mainly $1/2$ systems,...
Majorana fermion (MF) whose antiparticle is itself has been predicted in condensed matter systems. Signatures of the MFs have reported as zero energy modes various More definitive evidences are highly desired to verify existence MF. Very recently, theory induce spin selective Andreev reflection (SSAR), a novel magnetic property which can be used detect MFs. Here we report first observation SSAR from inside vortices Bi2Te3/NbSe2 hetero-structure, topological superconductivity was previously...
Non-centrosymmetric transition metal monopnictides, including TaAs, TaP, NbAs, and NbP, are emergent topological Weyl semimetals (WSMs) hosting exotic relativistic fermions. In this letter, we elucidate the physical origin of unprecedented charge carrier mobility which can reach $1\times10^{7}$ cm $^{2}$V$^{-1}$s$^{-1}$ at 1.5 K. Angle- temperature-dependent quantum oscillations, supported by density function theory calculations, reveal that NbP has coexistence p- n-type WSM pockets in...
The oxide interface between LaAlO3 and KTaO3(111) can harbor a superconducting state. We report that by applying gate voltage (VG) across KTaO3, the be continuously tuned from into insulating states, yielding dome-shaped Tc-VG dependence, where Tc is transition temperature. electric gating has only minor effect on carrier density but strong one mobility. interpret tuning of mobility in terms change spatial profile carriers hence, effective disorder. As temperature decreased, resistance...
We report the first experimental demonstration of electrical spin injection, transport and detection in bulk germanium (Ge). The non-local magnetoresistance n-type Ge is observable up to 225K. Our results indicate that relaxation rate closely related momentum scattering rate, which consistent with predicted Elliot-Yafet mechanism for Ge. bias dependence nonlocal lifetime also investigated.
Due to the strong Fermi-level pinning close germanium (Ge) valence band edge, all metal/p-type Ge contacts show Ohmic characteristics, while metal/n-type exhibit rectifying behaviors. In this paper, we report a simple method alleviate effect by inserting thin layer of aluminum oxide (Al2O3), formed oxidation (Al), between metal/Ge interface. The effective Schottky barrier heights nickel (Ni)∕n-type Ge, cobalt (Co)∕n-type and iron (Fe)∕n-type decrease from 0.54, 0.62, 0.61eV 0.39, 0.23,...
In recent years, electroactive polymers have been developed as actuator materials. As an important branch of polymers, electrothermal actuators (ETAs) demonstrate potential applications in the fields artificial muscles, biomimetic devices, robotics, and so on. Large-shape deformation, low-voltage-driven actuation, ultrafast fabrication are critical to development ETA. However, a simultaneous optimization all these advantages has not realized yet. Practical also rare. this work, we introduce...
We report on the observation of a ${T}_{c}\ensuremath{\sim}0.9\text{ }\text{ }\mathrm{K}$ superconductivity at interface between ${\mathrm{LaAlO}}_{3}$ film and $5d$ transition metal oxide ${\mathrm{KTaO}}_{3}(110)$ single crystal. The shows large anisotropy upper critical field, its superconducting is consistent with Berezinskii-Kosterlitz-Thouless transition. Both facts suggest that two-dimensional (2D) in nature. carrier density measured 5 K...
Charge density wave (CDW) material 1 T -TaS 2 was proposed as a quantum spin liquid candidate, on which cluster Mott insulator comes into being below the transition temperature. We report an experimental ultrafast generation and detection of coherent amplitude mode (AM) its CDW state. A salient feature emerges: The AM exhibits unusual 3.56 temperature dependence 65 K, in addition to observed 200 K range. This behavior suggests enhancement in-gap electronic excitations emergence new phase...
We examine the spin-triplet superconducting state of even parity mediated by ferromagnetic Hund's coupling between electrons in two almost degenerate orbital bands. This may be realized recently discovered ${\mathrm{LaFeAsO}}_{1\ensuremath{-}x}{\mathrm{F}}_{x}$. It is robust against orbital-independent disorder. The splitting degeneracy suppresses superconductivity and leads to an anisotropic spectrum Bogoliubov quasiparticle. former predicts a strong pressure dependence ${T}_{c}$ latter...
Fermi level (FL) pinning at the Ge valence band results in a high Schottky barrier height for all metal/n-Ge contacts. The origin of this effect has been ascribed to either metal induced gap states or surface arise from native defects surface, such as dangling bonds. discrepancy reported results/explanations is mainly due lack an explicit characterization quality metal/Ge metal/ultrathin oxide/Ge junction, which should be ideally single crystalline, atomically smooth and free process-induced...
Transparent actuators have been attracting emerging interest recently, as they demonstrate potential applications in the fields of invisible robots, tactical displays, variable-focus lenses, and flexible cellular phones. However, previous technologies did not simultaneously realize macroscopic transparent with advantages large-shape deformation, low-voltage-driven actuation fast fabrication. Here, we develop a approach to fabricate high-performance actuator based on single-layer superaligned...
Kitaev chain model with nearest neighbor interaction U is solved exactly at the symmetry point $\Delta=t$ and chemical potential $\mu=0$ in open boundary condition. By applying two Jordan-Wigner transformations a spin-rotation, such symmetric interacting mapped to non-interacting fermion model, which can be diagonalized exactly. The solutions include topologically non-trivial phase $|U|<t$ trivial $|U|>t$. phases are related by dualities. Quantum transitions studied help of exact solution.
Lithium (Li) metal is one of the most promising candidates as an anode for next-generation energy storage systems because its high specific capacity and lowest negative electrochemical potential. But growth Li dendrites limits application battery. In this work, a type modified battery with carbon nanotube (CNT) buffer layer inserted between separator electrode was reported. The results show that batteries have much better rate capability cycling performance than conventional batteries....
[Figure: see text].
The recent discovery of superconductivity at the interfaces between KTaO 3 and EuO (or LaAlO ) gives birth to second generation oxide interface superconductors. This exhibits a strong dependence on surface plane , in contrast seminal /SrTiO interface, superconducting transition temperature T c is enhanced by one order magnitude. For understanding its nature, crucial issue arises: Is formation indispensable for occurrence superconductivity? Exploiting ionic liquid (IL) gating, we are...
Spin liquid states for the spin-$\frac{1}{2}$ antiferromagnetic Heisenberg model on a hyperkagome lattice are studied. We classify and study flux according to symmetries. Applying this ${\mathrm{Na}}_{4}{\mathrm{Ir}}_{3}{\mathrm{O}}_{8}$, we propose that high temperature state may be described by spinon Fermi surface, which forms paired with line nodes below 20 K. The possible mixed spin singlet triplet pairing discussed symmetry breaks inversion.
Superconductivity in iron pnictides is studied by using a two-orbital Hubbard model the large U limit. The Coulomb repulsion induces an orbital-dependent pairing between charge carriers. found mainly from scattering within same Fermi pocket. interpocket pair scatterings determine symmetry of superconductivity, which extended s wave at small Hund's coupling, and d coupling U. former consistent with recent experiments angle-resolved photoemission spectroscopy Andreev reflection spectroscopy.
Scattering mechanisms in graphene are critical to understanding the limits of signal-to-noise ratios unsuspended devices. Here we present four-probe low-frequency noise (1/f) characteristics back-gated single layer (SLG) and bilayer (BLG) samples. Contrary expected increase with resistance, for SLG decreases near Dirac point, possibly due effects spatial charge inhomogeneity. For BLG, a similar reduction point is observed, but different gate dependence its behavior. Some possible reasons...
Possible superconductivity in the recently discovered (Tl,K)FexSe2 compounds is studied from viewpoint of doped Mott insulator. The insulating phase examined to be preferred parent compound at x=1.5 due presence Fe-vacancies. Partial filling vacancies Fe-sites introduces electron carriers and leads electron-doped superconductivity. By using a two-orbital Hubbard model strong-coupling limit, we find that s-wave pairing more favorable small Hund's coupling, dx2−y2-wave large coupling.
Majorana zero modes (MZMs) have been predicted to exist in the topological insulator (TI)/superconductor (SC) heterostructure. Recent spin polarized scanning tunneling microscope (STM) experiment$^{1}$ has observed spin-polarization dependence of bias differential conductance at center vortex core, which may be attributed selective Andreev reflection, a novel property MZMs theoretically 1-dimensional nanowire$^{2}$. Here we consider helical electron system described by Rashba orbit coupling...
Recently, several experiments [K. K. Gomes et al., Nature (London) 483, 306 (2012); S. Wang Phys. Rev. Lett. 113, 196803 (2014)] have illustrated that metal surface electrons can be manipulated to form a two-dimensional (2D) lattice by depositing designer molecule on surface. This offers promising new technique construct artificial 2D electron lattices. Here we theoretically propose pattern realize an Lieb surface, which shows flat electronic band due the geometry. We show localization of in...