126 citations · 777 across the 21 of their papers we have counts for
22 papers
Periodic Atomic Displacements and Visualization of the Electron-Lattice Interaction in the Cuprate
Zengyi Du, Hui Li, Genda Gu +3
Traditionally, X-ray scattering techniques have been used to detect the breaking of the structural symmetry of the lattice, which accompanies a periodic displacement of the atoms a…
Strongly-overdoped LaSrCuO: Evidence for Josephson-coupled grains of strongly-correlated superconductor
Yangmu Li, A. Sapkota, P. M. Lozano +20
The interpretation of how superconductivity disappears in cuprates at large hole doping has been controversial. To address this issue, we present an experimental study of single-cr…
Visualizing the Energy-gap Modulations of the Cuprate Pair Density Wave State
Zengyi Du, Hui Li, Sanghyun Joo +6
When Cooper pairs are formed with finite center-of-mass momentum, the defining characteristic is a spatially modulating superconducting energy gap . Recently, this concept ha…
Atomic-Scale Visualization of the Cuprate Pair Density Wave State
Zengyi Du, Hui Li, Kazuhiro Fujita
A recent discovery of the pair density wave (PDW) order creates a stir in understanding an underlying physics in the pseudogap states of the cuprate high temperature superconductor…
Homogeneous superconducting gap in DBCO synthesized by oxide molecular beam epitaxy
Ze-Bin Wu, Daniel Putzky, Asish K. Kundu +12
Much of what is known about high-temperature cuprate superconductors stems from studies based on two surface analytical tools, angle-resolved photoemission spectroscopy (ARPES) and…
Atomic-scale Electronic Structure of the Cuprate Pair Density Wave State Coexisting with Superconductivity
Peayush Choubey, Sang Hyun Joo, K. Fujita +9
The defining characteristic of hole-doped cuprates is -wave high temperature superconductivity. However, intense theoretical interest is now focused on whether a pair density wa…
Direct visualization of sign reversal s^+- superconducting gaps in FeTe0.55Se0.45
Mingyang Chen, Qingkun Tang, Xiaoyu Chen +7
In many unconventional superconductors, the pairing of electrons is driven by the repulsive interaction, which leads to the sign reversal of superconducting gaps along the Fermi su…
Directly visualizing the sign change of d-wave superconducting gap in Bi2Sr2CaCu2O8+δ by phase-referenced quasiparticle interference
Qiangqiang Gu, Siyuan Wan, Qingkun Tang +7
The superconducting state is achieved by the condensation of Cooper pairs and is protected by the superconducting gap. The pairing interaction between the two electrons of a Cooper…
Direct Evidence of Superconductivity with Twofold Symmetry in Bi2Te3 Thin Film Deposited on FeTe0.55Se0.45
Minyang Chen Xiaoyu Chen, Huan Yang, Zengyi Du +1
Topological superconductor is a timely and frontier topic in condensed matter physics. In superconducting state, an order parameter will be established with the basic or subsidiary…
Sign reversal superconducting gaps revealed by phase referenced quasi-particle interference of impurity induced bound states in (LiFe)OHFeZnSe
Qiangqiang Gu, Siyuan Wan, Zengyi Du +5
By measuring the spatial distribution of differential conductance near impurities on Fe sites, we have obtained the quasi-particle interference (QPI) patterns in the (LiFe$…
Vortex lattice and vortex bound states in CsFeAs investigated by scanning tunneling microscopy/spectroscopy
Xiong Yang, Zengyi Du, Hai Lin +4
We investigate the vortex lattice and vortex bound states in CsFeAs single crystals by scanning tunneling microscopy/spectroscopy (STM/STS) under various magnetic fields. A…
Discrete energy levels of Caroli-de Gennes-Martricon states in quantum limit due to small Fermi energy in FeTeSe
Mingyang Chen, Xiaoyu Chen, Huan Yang +4
Caroli-de Gennes-Martricon (CdGM) states were predicted in 1964 as low energy excitations within vortex cores of type-II superconductors. In the quantum limit, namely $T/T_\mathrm{…
Experimental Demonstration of the Sign Reversal of the Order Parameter in (Li1-xFex)OHFe1-yZnySe
Zengyi Du, Xiong Yang, Dustin Altenfeld +8
Iron pnictides are the only known family of unconventional high-temperature superconductors besides cuprates. Until recently, it was widely accepted that superconductivity is spin-…
Strong coupling superconductivity revealed by scanning tunneling microscope in tetragonal FeS
Xiong Yang, Zengyi Du, Guan Du +6
We investigate the electronic properties of the tetragonal FeS superconductor by using scanning tunneling microscope/spectroscopy. It is found that the typical tunneling spectrum o…
Drive the Dirac Electrons into Cooper Pairs in SrxBi2Se3
Guan Du, Jifeng Shao, Xiong Yang +9
Topological superconductor is a very interesting and frontier topic in condensed matter physics1. Despite the tremendous efforts in exploring the topological superconductivity, its…
Possible superconducting fluctuation and pseudogap state above in CsFeAs
Huan Yang, Jie Xing, Zengyi Du +5
Resistive, magnetization, torque, specific heat and scanning tunneling microscopy measurements are carried out on the hole heavily doped CsFeAs single crystals. A character…
Merging Dirac electrons and correlation effect in the heterostructured Bi2Te3/Fe1+dTe
Guan Du, Zengyi Du, Xiong Yang +4
The topological insulator and strong electronic correlation effect are two important subjects in the frontier studies of modern condensed matter physics. A topological insulator ex…
Scrutinizing the double superconducting gaps and strong coupling pairing in (Li1-xFexOH)FeSe
Zengyi Du, Xiong Yang, Hai Lin +6
In the iron based superconductors, one of the on-going frontier studies is about the pairing mechanism. The recent interest concerns the high temperature superconductivity and its…
Fully gapped superconductivity in In-doped topological crystalline insulator PbSnTe
Guan Du, Zengyi Du, Delong Fang +5
Superconductors derived from topological insulators and topological crystalline insulators by doping have long been considered to be candidates as topological superconductors. Pb$_…
Anisotropic Superconducting Gap and Elongated Vortices with Caroli-De-Gennes-Matricon States in the New Superconductor Ta4Pd3Te16
Zengyi Du, Delong Fang, Zhenyu Wang +5
The superconducting state is formed by the condensation of a large number of Cooper pairs. The normal state electronic properties can give significant influence on the superconduct…
Observation of a van Hove singularity and implication for strong coupling induced Cooper pairing in KFe2As2
Delong Fang, Xun Shi, Zengyi Du +14
Scanning tunneling spectroscopy (STS) and angle-resolved photoemission spectroscopy (ARPES) have been investigated on single crystal samples of KFe2As2. A van Hove singularity (vHs…
Unexpected Giant Superconducting Fluctuation and Anomalous Semiconducting Normal State in NdO1-xFxBi1-yS2 Single Crystals
Jianzhong Liu, Delong Fang, Zhenyu Wang +5
The BiS2-based superconductors were discovered recently. The superconductivity has been proved by many other groups. Since the previous experiments were all done on polycrystalline…