A5071841321- Quantum and electron transport phenomena
- Physics of Superconductivity and Magnetism
- Topological Materials and Phenomena
- Graphene research and applications
- Quantum, superfluid, helium dynamics
- Surface and Thin Film Phenomena
- Electronic and Structural Properties of Oxides
- Iron-based superconductors research
- Advanced Condensed Matter Physics
- Magnetic and transport properties of perovskites and related materials
- Atomic and Subatomic Physics Research
- Advancements in Semiconductor Devices and Circuit Design
- Rare-earth and actinide compounds
- Semiconductor Quantum Structures and Devices
- Quantum Computing Algorithms and Architecture
- Semiconductor materials and devices
- Cold Atom Physics and Bose-Einstein Condensates
- Natural Language Processing Techniques
- Superconducting Materials and Applications
- Quantum many-body systems
- Theoretical and Computational Physics
- Quantum Information and Cryptography
- Magnetic properties of thin films
- 2D Materials and Applications
- Spectroscopy and Quantum Chemical Studies
Peking University
2016-2025
Hefei University
2025
University of Chinese Academy of Sciences
2019-2024
Beijing Academy of Quantum Information Sciences
2019-2022
Collaborative Innovation Center of Quantum Matter
2015-2019
Hangzhou Normal University
2013-2014
Massachusetts Institute of Technology
2011-2012
University of Pennsylvania
2000
Two-dimensional (2D) transition metal dichalcogenides (TMDs) have a range of unique physics properties and could be used in the development electronics, photonics, spintronics quantum computing devices. The mechanical exfoliation technique micro-size TMD flakes has attracted particular interest due to its simplicity cost effectiveness. However, for most applications, large area high quality films are preferred. Furthermore, when thickness crystalline is down 2D limit (monolayer), exotic can...
Cooling to see the effects of disorder In sufficiently strong external magnetic fields, thin superconducting films typically become insulating. The presence can affect this phase transition. Theorists have proposed that cause so-called Griffiths singularity, where behavior system is determined by a small number islands form above critical field. Xing et al. observed signature such singularity in gallium analyzing transport data taken at very low temperatures (see Perspective Markovic)....
Through a combination of x-ray diffraction, electrical transport, magnetic susceptibility, and heat-capacity measurements, we report the effect La doping on Sr in newly discovered SrFBiS${}_{2}$ system. Superconducting transition with critical temperature T${}_{c}$ 2.8 K, developed from semiconducting-like normal state, was found Sr${}_{0.5}$La${}_{0.5}$FBiS${}_{2}$. A strong diamagnetic signal clear specific-heat anomaly associated this were observed, confirming bulk superconductivity. The...
We report on the observation of a helical Luttinger liquid in edge an InAs/GaSb quantum spin Hall insulator, which shows characteristic suppression conductance at low temperature and bias voltage. Moreover, power-law behavior as function The results underscore strong electron-electron interaction effect transport states. Because fact that Fermi velocity modes is controlled by gates, parameter can be fine tuned. Realization tunable offers one-dimensional model system for future studies...
After decades of explorations, suffering from low critical temperature and subtle nature, whether a metallic ground state exists in two-dimensional system beyond Anderson localization is still mystery. Supremely, phase coherence could be the key that unlocks its intriguing nature. This work reveals how quantum evolves across bosonic superconductor-metal-insulator transitions via magneto-conductance oscillations high-Tc superconducting films. A robust intervening anomalous characterized by...
Abstract It is a challenge to prepare photonic crystal (PC) automotive coatings via spraying colloidal solutions because the fast fabrication tends produce amorphous crystals with faint colors. Here, two‐step process followed by thermal curing developed waterproof PC bright, uniform, and angular‐dependent structural The solvents in paint are studied achieve quick formation of liquid intermediate, which transformed into highly crystalline coating. Thanks narrow intense reflections, as‐made...
Spin superfluid is a novel emerging quantum matter arising from the Bose-Einstein condensate (BEC) of spin-1 bosons. We demonstrate spin ground state in canted antiferromagnetic Cr2O3 thin film at low temperatures via nonlocal transport. A large enhancement signal observed below ~ 20 K, and it saturates 5 K down to 2 K. show that spins can propagate over very long distances (~ micro meters) such decreases slowly as spacing increases with an inverse relationship, which consistent theoretical...
A demonstration of fine control over the valley isospin in bilayer graphene leads to evidence an unusual type fractional quantum Hall effect and uncovers properties its many-body wave function.
Cd3As2 is a three-dimensional Dirac semimetal with separated points in momentum space. In spite of extensive transport and spectroscopic studies on its exotic properties, the evidence superconductivity surface states remains elusive. Here, we report observation proximity-induced Nb/Cd3As2 hybrid structures. Our four-terminal measurement identifies pronounced pairing gap (gap size comparable to Nb) surfaces, which exhibits flat conductance plateau differential spectra, consistent our...
Recent emergence of two-dimensional (2D) crystalline superconductors has provided a promising platform to investigate novel quantum physics and potential applications. To reveal essential phenomena therein, ultralow temperature transport investigation on high-quality ultrathin superconducting films is critically required, although it been quite challenging experimentally. Here, we report systematic study the PdTe2 grown by molecular beam epitaxy (MBE). Interestingly, new type Ising...
Some models of the 5/2 fractional quantum Hall state predict that quasiparticles, which carry charge, have non-Abelian statistics: exchange two quasiparticles changes wave function more dramatically than just usual change phase factor. Such statistics would make system less sensitive to decoherence, making it a candidate for implementation topological computation. We measure quasiparticle tunneling as temperature and dc bias between counterpropagating edge states. Fits theory give ${e}^{*}$,...
Abstract The phenomenon of fractional quantum Hall effect (FQHE) was first experimentally observed 33 years ago. FQHE involves strong Coulomb interactions and correlations among the electrons, which leads to quasiparticles with elementary charge. Three decades later, field is still active new discoveries technical developments. A significant portion attention in has been dedicated filling factor 5/2 state, for its unusual even denominator possible application topological computation....
Diverse phenomena emerge at the interface between band insulators LaAlO3 and SrTiO3, such as superconductivity ferromagnetism, showing an opportunity for potential applications well bringing fundamental research interests. Particularly, two-dimensional electron gas formed LaAlO3/SrTiO3 offers appealing platform quantum phase transition from a superconductor to weakly localized metal. Here we report superconductor-metal in superconducting LaAlO3/SrTiO3(110) driven by perpendicular magnetic...
Transport measurement, which applies an electric field and studies the migration of charged particles, i.e., current, is most widely used technique in condensed matter studies. It generally assumed that quantum phase remains unchanged when it hosts a sufficiently small probing is, surprisingly, rarely examined experimentally. In this Letter, we study ultra-high-mobility two-dimensional electron system using propagating surface acoustic wave, whose traveling speed affected by electrons'...
Quantum Griffiths singularity (QGS) reveals the profound influence of quenched disorder on quantum phase transitions, characterized by divergence dynamical critical exponent at boundary vortex glass-like phase, named as phase. However, in absence vortices, whether QGS can exist under parallel magnetic field remains a puzzle. Here we study induced superconductor-metal transition ultrathin crystalline PdTe2 films grown molecular beam epitaxy. Remarkably, emerges both perpendicular and...
The metallic ground state in two-dimensional (2D) superconductors has attracted much attention but is still under intense scrutiny. Especially, the measurements ultralow temperature region are challenging for 2D due to sensitivity external perturbations. In this work, resistance saturation induced by noise, named as "extrinsic anomalous state", observed transition metal dichalcogenide (TMD) superconductor 4Ha-TaSe2 nanodevices. However, with further decreasing temperature, credible evidence...
Some theories predict that the filling factor 5/2 fractional quantum Hall state can exhibit non-Abelian statistics, which makes it a candidate for fault-tolerant topological computation. Although Pfaffian and its particle-hole conjugate, anti-Pfaffian state, are most plausible wave functions there number of alternatives with either Abelian or statistics. Recent experiments suggest tunneling exponents more consistent an rather than state. Here, we present edge-current-tunneling in...
The phase transitions from one plateau to the next or an insulator in quantum Hall and anomalous (QAH) systems have revealed universal scaling behaviors. A magnetic-field-driven transition a QAH axion was recently demonstrated magnetic topological sandwich samples. Here, we show that temperature dependence of derivative longitudinal resistance on field at point follows characteristic power-law indicates behavior for transition. Similar transition, can also be understood by Chalker-Coddington...
We systematically study the acoustocurrent of two-dimensional electron systems in integer and fractional quantum Hall regimes using surface acoustic waves. are able to separate coexisting scattering drag, when phonons induce a drag current tune conductivity, respectively. At large power, is finite system compressible exhibits minima incompressible states appear. Surprisingly, it anomalously bipolar spikes within plateaus while vanishes linearly with reduced power at phases. The peaks reverse...
An algorithm is proposed to optimize quantum Monte Carlo (QMC) wave functions based on Newton’s method and analytical computation of the first second derivatives variational energy. This direct application principle yields significantly lower energy than variance minimization methods when applied same trial function. Quadratic convergence local minimum parameters achieved. A general theorem presented, which substantially simplifies analytic expressions in case function optimization. To...
While in the lowest Landau level electron-electron interaction leads to formation of Wigner crystal, higher levels a solid phase with multiple electrons lattice site crystal was predicted, which called bubble phase. Reentrant integer quantum Hall states are believed be insulating pinned by disorder. We carry out nonlinear transport measurements on reentrant and study de-pinning phase, is complementary previous microwave provides unique information. In this study, conductivity directly...
We report low-temperature transport measurements in strained $\mathrm{InAs}/\mathrm{G}{\mathrm{a}}_{0.68}\phantom{\rule{0.16em}{0ex}}\mathrm{I}{\mathrm{n}}_{0.32}\mathrm{Sb}$ quantum wells, which supports time-reversal symmetry-protected helical edge states. The temperature and bias voltage dependence of the conductance for devices various sizes are consistent with theoretical expectation a weakly interacting state. Moreover, we found that magnetoresistance states is related to interaction...
In this paper, we systematically study the electron doping effect in a new BiS 2 -based system Sr 1-x La x FBiS (0 ≤ 0.7) through multiple techniques of X-ray diffraction, electrical transport, magnetic susceptibility, and Hall measurements.The parent compound SrFBiS is found to possess semiconducting-like ground state, with thermally activation energy E g ∼ 38 meV.By partial substitution for Sr, superconductivity emerges when > 0.3, reaching its maximal superconducting transition...
Abstract Due to the intrinsic spontaneous and piezoelectric polarization effect, III‐nitride semiconductor heterostructures are promising candidates for generating 2D electron gas (2DEG) system. Among III‐nitrides, InN is predicted be best conductive‐channel material because its electrons have smallest effective mass it exhibits large band offsets at heterointerface of GaN/InN or AlN/InN. Until now, that prediction has remained theoretical, due a giant gap between optimal growth windows GaN,...
Abstract Even-denominator fractional quantum Hall (FQH) states, such as 5/2 and 7/2, have been well known in a two-dimensional electron gas (2DEG) for decades are still investigated candidates of non-Abelian statistics. In this paper, we present the observation 3/2 FQH plateau single-layer 2DEG with lateral confinement at bulk filling factor 5/3. The is quantized $$\left( {\frac{h}{{e^2}}} \right)/\left( {\frac{3}{2}} \right)$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML">...