Bulletin of the American Physical Society
APS March Meeting 2021
Volume 66, Number 1
Monday–Friday, March 15–19, 2021; Virtual; Time Zone: Central Daylight Time, USA
Session B51: Topological Materials: Graphene and Thin films
11:30 AM–2:30 PM,
Monday, March 15, 2021
Sponsoring
Unit:
DMP
Chair: Peter Armitage, Johns Hopkins University
Abstract: B51.00006 : Electrical Transport Study in α-Sn Films Grown by Molecular Beam Epitaxy
12:30 PM–12:42 PM
Live
Presenter:
Yuanfeng Ding
(Nanjing Univ)
Authors:
Yuanfeng Ding
(Nanjing Univ)
Jinshan Yao
(Nanjing Univ)
Junwei Huang
(Nanjing Univ)
Ziyuan Yuan
(Nanjing Univ)
Chen Li
(Nanjing Univ)
Hongtao Yuan
(Nanjing Univ)
Hong Lu
(Nanjing Univ)
Yan-Feng Chen
(Nanjing Univ)
We have grown a series of α-Sn films with different thicknesses on InSb and CdTe substrates, respectively, by molecular beam epitaxy (MBE). The high quality has been confirmed by structural characterizations such as X-ray diffraction and transmission electron microscope. The temperature- and thickness-dependent electrical transport of the α-Sn films have been investigated. A large magnetoresistance (MR) has been observed in the α-Sn/InSb heterostructures, up to over 450,000% at 1.5 K and 14 T. On the other hand, multiple transitions in transport type have been observed in the α-Sn films grown on CdTe substrates, which can be well explained by a three-band model. We have established a phase diagram illustrating the transport behaviors of α-Sn. These results can give more insights into the transport mechanism and potential applications of this material system.
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