Signatures of an annular Fermi sea
Abstract
The concept of a Fermi surface, the constant-energy surface containing all the occupied electron states in momentum, or wave-vector (k), space plays a key role in determining electronic properties of conductors. In two-dimensional (2D) carrier systems, the Fermi surface becomes a contour which, in the simplest case, encircles the occupied states. In this case, the area enclosed by the contour, which we refer to as the Fermi sea (FS), is a simple disk. In this work, we report the observation of an FS with a new topology, namely, an FS in the shape of an annulus. Such an FS is expected in a variety of 2D systems where the energy band dispersion supports a ring of extrema at finite k, but its experimental observation has been elusive. Our study provides (1) theoretical evidence for the presence of an annular FS in 2D hole systems confined to wide GaAs quantum wells and (2) experimental signatures of the onset of its occupation as an abrupt rise in the sample resistance, accompanied by a sudden appearance of Shubnikov–de Haas oscillations at an unexpectedly high frequency whose value does not simply correspond to the (negligible) density of holes contained within the annular FS.
- Authors:
-
- Princeton Univ., NJ (United States)
- Northern Illinois Univ., DeKalb, IL (United States)
- Publication Date:
- Research Org.:
- Princeton Univ., NJ (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF); Gordon and Betty Moore Foundation (GBMF); Keck Foundation
- OSTI Identifier:
- 1535825
- Alternate Identifier(s):
- OSTI ID: 1338102
- Grant/Contract Number:
- FG02-00ER45841; DMR-1305691; DMR-1310199; MRSEC DMR-1420541; GBMF4420; DMR-MRI-1126061; FG02-00-ER45841
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review. B
- Additional Journal Information:
- Journal Volume: 95; Journal Issue: 3; Journal ID: ISSN 2469-9950
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; materials science; physics; electrical conductivity; Fermi surface; spin-orbit coupling; Shubnikov-de Haas effect
Citation Formats
Jo, Insun, Liu, Yang, Pfeiffer, L. N., West, K. W., Baldwin, K. W., Shayegan, M., and Winkler, R. Signatures of an annular Fermi sea. United States: N. p., 2017.
Web. doi:10.1103/physrevb.95.035103.
Jo, Insun, Liu, Yang, Pfeiffer, L. N., West, K. W., Baldwin, K. W., Shayegan, M., & Winkler, R. Signatures of an annular Fermi sea. United States. https://doi.org/10.1103/physrevb.95.035103
Jo, Insun, Liu, Yang, Pfeiffer, L. N., West, K. W., Baldwin, K. W., Shayegan, M., and Winkler, R. Tue .
"Signatures of an annular Fermi sea". United States. https://doi.org/10.1103/physrevb.95.035103. https://www.osti.gov/servlets/purl/1535825.
@article{osti_1535825,
title = {Signatures of an annular Fermi sea},
author = {Jo, Insun and Liu, Yang and Pfeiffer, L. N. and West, K. W. and Baldwin, K. W. and Shayegan, M. and Winkler, R.},
abstractNote = {The concept of a Fermi surface, the constant-energy surface containing all the occupied electron states in momentum, or wave-vector (k), space plays a key role in determining electronic properties of conductors. In two-dimensional (2D) carrier systems, the Fermi surface becomes a contour which, in the simplest case, encircles the occupied states. In this case, the area enclosed by the contour, which we refer to as the Fermi sea (FS), is a simple disk. In this work, we report the observation of an FS with a new topology, namely, an FS in the shape of an annulus. Such an FS is expected in a variety of 2D systems where the energy band dispersion supports a ring of extrema at finite k, but its experimental observation has been elusive. Our study provides (1) theoretical evidence for the presence of an annular FS in 2D hole systems confined to wide GaAs quantum wells and (2) experimental signatures of the onset of its occupation as an abrupt rise in the sample resistance, accompanied by a sudden appearance of Shubnikov–de Haas oscillations at an unexpectedly high frequency whose value does not simply correspond to the (negligible) density of holes contained within the annular FS.},
doi = {10.1103/physrevb.95.035103},
journal = {Physical Review. B},
number = 3,
volume = 95,
place = {United States},
year = {Tue Jan 03 00:00:00 EST 2017},
month = {Tue Jan 03 00:00:00 EST 2017}
}
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