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Conductance Quantization in PbTe Nanowires
Wenyu Song, Yuhao Wang, Wentao Miao +17
PbTe nanowires coupled to a superconductor have recently been proposed as a potential Majorana platform. The hallmark of the one-dimensional nature of ballistic nanowires is their…
Berry-phase switch in electrostatically-confined topological surface states
Jun Zhang, Ye-ping Jiang, Xu-Cun Ma +1
Here we visualize the trapping of topological surface states in the circular n-p junctions on the top surface of the 7-quintuple-layer three dimensional (3D) topological insulator…
Selective Trapping of Hexagonally Warped Topological Surface States in a Triangular Quantum Corral
Mu Chen, Yeping Jiang, Junping Peng +10
The surface of a three-dimensional topological insulator (TI) hosts two-dimensional massless Dirac fermions (DFs), the gapless and spin-helical nature of which yields many exotic p…
Ambi-chiral anomalous Hall effect in magnetically doped topological insulators
Chang Liu, Yunyi Zang, Yan Gong +4
The chirality associated with broken time reversal symmetry in magnetically doped topological insulators has important implications to the quantum transport phenomena. Here we repo…
Atomic-Scale Probing of Heterointerface Phonon Bridges in Nitride Semiconductor
Yue-Hui Li, Rui-Shi Qi, Ruo-Chen Shi +12
Interface phonon modes that are generated by several atomic layers at the heterointerface play a major role in the interface thermal conductance for nanoscale high-power devices su…
Distinct quantum anomalous Hall ground states induced by magnetic disorders
Chang Liu, Yunbo Ou, Yang Feng +8
The quantum anomalous Hall (QAH) effect in magnetic topological insulator (TI) represents a new state of matter originated from the interplay between topology and magnetism. The de…
From atomic layer to the bulk: low-temperature atomistic structure, ferroelectric and electronic properties of SnTe films
Thaneshwor P. Kaloni, Kai Chang, Brandon J. Miller +5
SnTe hosts ferroelectricity that competes with its weak non-trivial band topology: in the high-symmetry rocksalt structure--in which its intrinsic electric dipole is quenched--this…
Anomalous Hall Effect and Spin Fluctuations in Ionic Liquid Gated SrCoO Thin Films
Ding Zhang, Hiroaki Ishizuka, Nianpeng Lu +4
The recent realization of epitaxial SrCoO thin films has triggered a renewed interest in their electronic, magnetic, and ionic properties. Here we uncover several unusual magne…
Enhanced electron dephasing in three-dimensional topological insulators
Jian Liao, Yunbo Ou, Haiwen Liu +4
Study of the dephasing in electronic systems is not only important for probing the nature of their ground states, but also crucial to harnessing the quantum coherence for informati…
Spin Fluctuation Induced Linear Magnetoresistance in Ultrathin Superconducting FeSe Films
Qingyan Wang, Wenhao Zhang, Weiwei Chen +10
The discovery of high-temperature superconductivity in FeSe/STO has trigged great research interest to reveal a range of exotic physical phenomena in this novel material. Here we p…
Gate-Variable Mid-Infrared Optical Transitions in a Topological Insulator
William S. Whitney, Victor W. Brar, Yunbo Ou +6
We report mid-infrared spectroscopy measurements of an electrostatically gated topological insulator, in which we observe several percent modulation of transmittance and reflectanc…
Experimental Observation of the Quantum Anomalous Hall Effect in a Magnetic Topological Insulator
Cui-Zu Chang, Jinsong Zhang, Xiao Feng +20
The quantized version of the anomalous Hall effect has been predicted to occur in magnetic topological insulators, but the experimental realization has been challenging. Here, we r…
Band engineering of Dirac surface states in topological insulators-based van der Waals heterostructures
Cui-Zu Chang, Peizhe Tang, Xiao Feng +5
The existence of gapless Dirac surface band of a three dimensional (3D) topological insulator (TI) is guaranteed by the non-trivial topological character of the bulk band, yet the…
Field-effect Modulation of Anomalous Hall Effect in Diluted Ferromagnetic Topological Insulator Epitaxial Films
Cui-Zu Chang, Min-Hao Liu, Zuo-Cheng Zhang +3
High quality chromium (Cr) doped three-dimensional topological insulator (TI) Sb2Te3 films are grown via molecular beam epitaxy on heat-treated insulating SrTiO3(111) substrates. W…
Band structure and charge doping effects of potassium-adsorbed FeSe/SrTiO3 system
Fawei Zheng, Li-Li Wang, Qi-Kun Xue +1
We theoretically study, through combining the density functional theory and an unfolding technique, the electronic band structure and the charge doping effects for the deposition o…
Observation of Anderson localization in ultrathin films of three-dimensional topological insulators
Jian Liao, Yunbo Ou, Xiao Feng +8
Anderson localization, the absence of diffusive transport in disordered systems, has been manifested as hopping transport in numerous electronic systems, whereas in recently discov…
Probing Dirac Fermion Dynamics in Topological Insulator BiSe Films with Scanning Tunneling Microscope
Can-Li Song, Lili Wang, Ke He +4
Scanning tunneling microscopy and spectroscopy have been used to investigate the femtosecond dynamics of Dirac fermions in the topological insulator BiSe ultrathin films. A…
Quantum and Classical Magnetoresistance in Ambipolar Topological Insulator Transistors with Gate-tunable Bulk and Surface Conduction
Jifa Tian, Cuizu Chang, Helin Cao +4
Weak antilocalization (WAL) and linear magnetoresistance (LMR) are two most commonly observed magnetoresistance (MR) phenomena in topological insulators (TIs) and often attributed…
Topological Superconductor Bi2Te3/NbSe2 heterostructures
Jin-Peng Xu, Canhua Liu, Mei-Xiao Wang +11
Topological superconductors (TSCs) have a full gap in the bulk and gapless surface states consisting of Majorana fermions, which have potential applications in fault-tolerant topol…
Direct observation of quantum confinement of massless Dirac fermions in a topological insulator
Mu Chen, Zhen-Guo Fu, Jun-Ping Peng +9
Since the discovery of topological insulators (TIs)1,2, the peculiar nature of their chiral surface states has been experimentally demonstrated both in bulk and in film materials w…
Experimental Proof of Universal Conductance Fluctuation in Quasi-1D Epitaxial BiSe Wires
Sadashige Matsuo, Kensaku Chida, Daichi Chiba +8
We report on conductance fluctuation in quasi-one-dimensional wires made of epitaxial BiSe thin film. We found that this type of fluctuation decreases as the wire lengt…
Crossover between Weak Antilocalization and Weak Localization of Bulk States in Ultrathin Bi2Se3 Films
Huichao Wang, Haiwen Liu, Cui-Zu Chang +9
We report transport studies on the 5 nm thick Bi2Se3 topological insulator films which are grown via molecular beam epitaxy technique. The angle-resolved photoemission spectroscopy…
Demonstration of surface transport in a hybrid Bi2Se3/Bi2Te3 heterostructure
Yanfei Zhao, Cui-Zu Chang, Ying Jiang +9
In spite of much work on topological insulators (TIs), systematic experiments for TI/TI heterostructures remain absent. We grow a high quality heterostructure containing single qui…
Weak Antilocalization and Conductance Fluctuation in a Sub-micrometer-sized Wire of Epitaxial Bi2Se3
Sadashige Matsuo, Tomohiro Koyama, Kazutoshi Shimamura +9
In this study, we address the phase coherent transport in a sub-micrometer-sized Hall bar made of epitaxial Bi2Se3 thin film by probing the weak antilocalization (WAL) and the magn…