Direct Visualization and Manipulation of Tunable Quantum Well State in Semiconducting Nb2SiTe4.
ACS nano 15:10 (2021) 15850-15857
Abstract:
Quantum well states (QWSs) can form at the surface or interfaces of materials with confinement potential. They have broad applications in electronic and optical devices such as high mobility electron transistor, photodetector, and quantum well laser. The properties of the QWSs are usually the key factors for the performance of the devices. However, direct visualization and manipulation of such states are, in general, challenging. In this work, by using angle-resolved photoemission spectroscopy (ARPES) and scanning tunneling microscopy/spectroscopy (STM/STS), we directly probe the QWSs generated on the vacuum interface of a narrow band gap semiconductor Nb2SiTe4. Interestingly, the position and splitting of QWSs could be easily manipulated via potassium (K) dosage onto the sample surface. Our results suggest Nb2SiTe4 to be an intriguing semiconductor system to study and engineer the QWSs, which has great potential in device applications.Anomalous Hall effect in ferrimagnetic metal RMn6Sn6 (R = Tb, Dy, Ho) with clean Mn kagome lattice
Applied Physics Letters AIP Publishing 119:9 (2021) 092405
Measurement of Superconductivity and Edge States in Topological Superconductor Candidate TaSe3 Supported by the National Key R&D Program of China (Grant No. 2017YFA0305400), the Shanghai Technology Innovation Action Plan 2020-Integrated Circuit Technology Support Program (Grant No. 20DZ1100605), the National Natural Science Foundation of China (Grant Nos. 52072168, 21733001, 51861145201, U1932217, and 11974246), the National Key Basic Research Program of China (Grant No. 2018YFA0306200), and the Science and Technology Commission of Shanghai Municipality (Grant No. 19JC1413900).
Chinese Physics Letters IOP Publishing 38:7 (2021) 077302
Experimental evidence for a metastable state in FeTe1−x Se x following coherent-phonon excitation
Journal of Electron Spectroscopy and Related Phenomena Elsevier 250 (2021) 147085
Observation of the critical state to multiple-type Dirac semimetal phases in KMgBi
Journal of Applied Physics AIP Publishing 129:23 (2021) 235109