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Liquid-liquid phase transition in water

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Science China(Physics,Mechanics & Astronomy) 2014年第5期57卷 810-818页

作者： SUN ZhaoRu SUN Gang CHEN YiXuan XU LiMei international Center for quantum materials Peking University

Water shows anomalies different from most of other *** sceniaros have been proposed to explain water anomalies,among which the liquid-liquid phase transition(LLPT)is the most discussed *** attributes water anomalies to the existence of a hypothesized liquid-liquid critical point(LLCP)buried deep in the supercooled *** briefly review the recent experimental and theoretical progresses on the study of the LLPT in *** studies include the discussion on the existence of the first order LLPT in supercooled water and the detection of liquid-liquid critical *** results of different water models for LLPT and the experimental evidence in confined water are also discussed.

关键词： liquid-liquid phase transition liquid-liquid critical point water anomalies

Correlation,superconductivity and topology in graphene moirésuperlattice

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Frontiers of physics 2023年第4期18卷 199-207页

作者： Lingxiao Li Min Wu Xiaobo Lu international centre for quantum materials Peking UniversityBeijing 100871China

Moirésuperlattices created by stacking different pieces of two-dimensional layered materials with a slight lattice mismatch have recently emerged as an exceptional platform for exploring emergent quantum *** stark contrast to the“parent”materials,the electronic band structures are significantly modified from moiréengineering due to the large-scale periodic moirépotential and interlayer *** this paper,we mainly focus on the recent progresses achieved in graphene-based moirésystems which have been a condensed-matter playground showing unprecedented abundance of quantum states such as strongly correlated states,superconductivity and novel band topologies.

关键词： twisted graphene moirésuperlattices correlation superconductivity topology

Direct evidence of high temperature superconductivity in one-unit-cell FeSe films on SrTiO_3 substrate by transport and magnetization measurements

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Chinese Physics B 2015年第11期24卷 15-22页

作者：邢颖王健 international Center for quantum materials School of Physics Peking University Collaborative Innovation Center of quantum Matter

Zero resistance and Meissner effect are two crucial experimental evidences of superconductivity in determining a new kind of superconductor, which can be detected by transport and diamagnetic measurements. In this paper, we briefly review the main transport and magnetization results on the one unit cell （1-UC） FeSe films grown on SrTiO3 （STO） substrates from our team in recent years, which identify the high temperature superconductivity in 1-UC FeSe films.

关键词： two-dimensional superconductivity one-unit-cell FeSe transport measurement diamagnetic prop-erty

The discovery of a quantum Griffiths singularity in superconducting films

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National Science Review 2016年第4期3卷 395-396页

作者： Nan-Lin Wang international Center for quantum materials School of PhysicsPeking University

More than 40 years ago,Robert B Griffiths proposed that phase transitions can be dramatically changed by a disorder effect and,in particular,that it is possible for the dynamical critical exponent to diverge[1].Since that time,this theory has been applied to quantum phase transitions(QPTs)and has been developed into the concept of the quantum Griffiths ***,the primary

关键词： very SMT The discovery of a quantum Griffiths singularity in superconducting films

Recent experimental progress of fractional quantum Hall effect: 5/2 illing state and graphene

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National Science Review 2014年第4期1卷 564-579页

作者： X.Lin R.R.Du X.C.Xie international Center for quantum materials Peking University

The phenomenon of fractional quantum Hall efect(FQHE)was irst experimentally observed 33 years *** involves strong Coulomb interactions and correlations among the electrons,which leads to quasiparticles with fractional elementary *** decades later,the ield of FQHE is still active with new discoveries and new technical developments.A signiicant portion of atention in FQHE has been dedicated to illing factor 5/2 state,for its unusual even denominator and possible application in topological quantum ***,FQHE has been observed in high-mobility Ga As heterostructure,but new materials such as graphene also open up a new area for *** review focuses on recent progress of FQHE at 5/2 state and FQHE in graphene.

关键词： fractional quantum Hall efect experimental progress 5/2 state graphene

Symmetry transformation of nonlinear optical current of tilted Weyl nodes and application to ferromagnetic MnBi_(2)Te_(4)

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Chinese Physics B 2024年第4期33卷 160-171页

作者：卢倬成冯济 international Center for quantum materials School of PhysicsPeking UniversityBeijing 100871China

A Weyl node is characterized by its chirality and *** develop a theory of how nth-order nonlinear optical conductivity behaves under transformations of anisotropic tensor and tilt, which clarifies how chirality-dependent and-independent parts of optical conductivity transform under the reversal of tilt and *** on this theory, we propose ferromagnetic Mn Bi2Te4as a magnetoelectrically regulated, terahertz optical device, by magnetoelectrically switching the chiralitydependent and-independent DC *** results are useful for creating nonlinear optical devices based on the topological Weyl semimetals.

关键词： nonlinear optical response topological Weyl semimetals chiral anomaly

Cryogenic amplifier with low input-referred voltage noise calibrated by shot noise measurement

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Chinese Physics B 2018年第6期27卷 207-212页

作者： Wuhao Yang Jian Wei international Center for quantum materials School of Physics Peking University Beijing 100871 China

A low-noise cryogenic amplifier for the bandwidth from 100 kHz to 2 MHz with commercially available components is presented. The amplifier is mounted on the cold finger of our home-made liquid helium dipstick. The input imp√edance of the amplifier is 2 k？. The input-referred voltage noise of the amplifier at approximately 2 MHz is around 1 n V/Hz^（1/2）. We demonstrate the performance of the amplifier by measuring shot noise on the Al/AlOx/Al tunneling junction with resistance about 17 k？ at liquid helium temperature.

关键词： cryogenic amplifier shot noise shadow evaporation tunneling junction

Density-wave tendency from a topological nodal-line perspective

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Chinese Physics B 2023年第5期32卷 627-636页

作者：赵天伦张亿 international Center for quantum materials School of PhysicsPeking UniversityBeijing 100871China

The understanding of density waves is a vital component of our insight into electronic quantum matters. Here, we propose an additional mosaic to the existing mechanisms such as Fermi-surface nesting, electron–phonon coupling, and exciton condensation. In particular, we find that certain two-dimensional(2D) spin density-wave systems are equivalent to three-dimensional(3D) Dirac nodal-line systems in the presence of a magnetic field, whose electronic structure takes the form of Dirac-fermion Landau levels and allows a straightforward analysis of its optimal filling. The subsequent minimumenergy wave vector varies over a continuous range and shows no direct connection to the original Fermi surfaces in ***, we carry out numerical calculations where the results on model examples support our theory. Our study points out that we have yet to attain a complete understanding of the emergent density wave formalism.

关键词： density waves Dirac nodal-line optimal wave vector

Radiation-Induced Oscillating Gap States of Nonequilibrium Two-Dimensional Superconductors

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Chinese Physics Letters 2018年第6期35卷 75-78页

作者： Hui-Ying Liu Jun-Ren Shi international Center for quantum materials Peking UniversityBeijing 100871 Collaborative Innovation Center of quantum Matter Beijing 100871

We study the effects of infrared radiation on a two-dimensional Bardeen-Cooper-Schrieffer superconductor coupled with a normal metal substrate through a tunneling *** phase transition is analyzed by inspecting the stability of the system against perturbations of pairing *** find an oscillating gap phase with a frequency not directly related to the radiation frequency,but instead resulting from the asymmetry of electron density of states of the system as well as the tunneling *** such a superconductor is in contact with another superconductor,gives rise to an unusual alternating Josephson current.

关键词： Radiation-Induced Oscillating Gap States of Nonequilibrium Two-Dimensional Superconductors