Bulletin of the American Physical Society
APS March Meeting 2022
Volume 67, Number 3
Monday–Friday, March 14–18, 2022; Chicago
Session M59: Disorder and Defects in Topological Materials
8:00 AM–10:00 AM,
Wednesday, March 16, 2022
Room: Hyatt Regency Hotel -DuSable AB
Sponsoring
Unit:
DCMP
Chair: Suyang Xu, Harvard University
Abstract: M59.00009 : Defect scattering on the ultraclean topological semimetal PtSn4 via STM*
9:36 AM–9:48 AM
Presenter:
Dong Chen
(University of British Columbia)
Authors:
Dong Chen
(University of British Columbia)
Sarah Burke
(University of British Columbia)
Douglas A Bonn
(University of British Columbia)
Ashley N Warner
(University of British Columbia)
Seokhwan Choi
(University of British Columbia)
Samikshya Sahu
(The University of British Columbia)
Mohamed Oudah
(University of British Columbia)
Alannah M Hallas
(University of British Columbia)
Jisun Kim
(University of British Columbia)
Vanessa King
(University of British Columbia)
Collaboration:
UBC Laboratory for Atomic Imaging Research, UBC Quantum Materials Design Lab
PtSn4 has a planar structure and is easy to cleave, presenting different surface terminations suitable for a scanning tunneling microscope study. We performed topography, bias spectroscopy, and quasiparticle interference measurements (QPI) at low temperatures. Multiple defect types were found and characterized. The overall defect density is relatively low which enabled us to perform spectroscopy maps of spatially isolated defects. Most of the defects acting as scattering centers seem to reside in the Sn layers. Rarely, we observe defects with 4-fold symmetry associated with the Pt layer. Analyzing the phase information captured by the QPI allows us to identify the defects responsible for the most prominent scattering. In this talk, I will try to elucidate the origin of the extremely low residual resistance of PtSn4 as well as provide an outlook on the potential for QPI measurement to characterize band topology.
*Natural Sciences and Engineering Research Council(NSERC) RGPIN-2018-04280, Max Planck-UBC-UTokyo Center for Quantum Materials and the Canada First Research Excellence Fund, Quantum Materials and Future Technologies Program
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