Bulletin of the American Physical Society
2023 APS March Meeting
Volume 68, Number 3
Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time
Session B23: Disorder and Topological Defects in Topological Phases
11:30 AM–2:30 PM,
Monday, March 6, 2023
Room: Room 215
Sponsoring
Unit:
DCMP
Chair: Raquel Queiroz, Columbia University
Abstract: B23.00010 : Defect scattering in the Ultraclean Dirac nodal arc semimetal PtSn4*
1:18 PM–1:30 PM
Presenter:
Dong Chen
(University of British Columbia)
Authors:
Dong Chen
(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)
Markus Altthaler
(The University of British Columbia)
Niclas P Heinsdorf
(Max-Planck Institute for Solid State Research)
Alannah M Hallas
(University of British Columbia)
Sarah Burke
(The University of British Columbia)
Douglas A Bonn
(The University of British Columbia)
Collaboration:
LAIR Group UBC
Hallas Group UBC
Using Scanning Tunnelling Microscopy (STM) and Spectroscopy (STS) and Quasiparticle Interference (QPI), we investigated the topography, electronic structure, and scattering by defects at low temperatures. The low defect density enables spectroscopic maps and QPI measurements of spatially isolated defects. Most defects appear to reside in the Sn layers. Rarely, we observe defects with 4-fold symmetric appearance associated with the Pt layer. The defect densities expected from starting impurities and RRR are compared with the observed densities, while information captured by the QPI allows us to identify the defects responsible for the most prominent scattering.
Aided by ab-initio calculations, we compare the scattering features observed in QPI to the band structure and study the composition and topology of the Fermi surface.
**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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