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Quantum oscillations and quasiparticle properties of thin film

Cornell Affiliated Author(s)

Author

Yawen Fang
Hari Nair
Ludi Miao
Berit Goodge
Nathaniel Schreiber
Jacob Ruf
Lena Kourkoutis
Kyle Shen
Darrell Schlom
B. Ramshaw

Abstract

We measure the Shubnikov-de Haas effect in thin-film grown on an substrate. We detect all three known Fermi surfaces and extract the Fermi surface volumes, cyclotron effective masses, and quantum lifetimes. We show that the electronic structure is nearly identical to that of single-crystal , and that the quasiparticle lifetime is consistent with the of comparably clean, single-crystal . Unlike single-crystal , where the quantum and transport lifetimes are roughly equal, we find that the transport lifetime is times longer than the quantum lifetime. This may suggest that extended (rather than point) defects could be the dominant source of quasiparticle scattering in these films. To test this hypothesis, we perform cross-sectional scanning transmission electron microscopy and find that out-of-phase boundaries extending the entire thickness of the film occur with a density that is consistent with the quantum mean free path. The long quasiparticle lifetimes make these films ideal for studying the unconventional superconducting state in through the fabrication of devices—such as planar tunnel junctions and superconducting quantum interference devices. © 2021 American Physical Society

Date Published

Journal

Physical Review B

Volume

104

Issue

4

URL

https://www.scopus.com/inward/record.uri?eid=2-s2.0-85111695753&doi=10.1103%2fPhysRevB.104.045152&partnerID=40&md5=fa5d1bb00d95646f76d2df96f1409675

DOI

10.1103/PhysRevB.104.045152

Group (Lab)

Brad Ramshaw Group
Kyle Shen Group

Funding Source

DMR-1709255
DGE-1650441
DMR-1539918
1429155
DMR-1644779
DMR-1752784
NNCI-2025233
FA9550-15-1-0474
GBMF3850
GBMF9073
DMR-1719875

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