Journal
PHYSICAL REVIEW B
Volume 79, Issue 20, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.79.201304
Keywords
bismuth; Fermi surface; Landau levels; nanowires; surface states; thermoelectric power; thermomagnetic effects
Funding
- Division of Materials Research of the U. S. National Science Foundation
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [0849285, 0839955, GRANTS:13795878] Funding Source: National Science Foundation
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We studied trigonal Bi nanowires (30 nm < diameter < 200 nm) via low-temperature magnetotransport for fields up to 14 T in order to investigate the role of their surfaces. A two-dimensional behavior was expected; we found instead a three-dimensional behavior, with a rich spectrum of Landau levels in a nearly spherical Fermi surface. We show that recent observations of sharp peaks in the bulk-Bi Nernst thermopower near the 9 T quantum limit attributed to charge fractionalization, can be more plausibly interpreted in terms of surface states. Bismuth has a true quantum limit at around 70 T.
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