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Signatures of an annular Fermi sea

Author(s): Jo, Insun; Liu, Yang; Pfeiffer, LN; West, KW; Baldwin, KW; et al

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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. Here 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.
Publication Date: Jan-2017
Electronic Publication Date: 3-Jan-2017
Citation: Jo, Insun, Liu, Yang, Pfeiffer, LN, West, KW, Baldwin, KW, Shayegan, M, Winkler, R. (2017). Signatures of an annular Fermi sea. Physical Review B, 95 (3), 10.1103/PhysRevB.95.035103
DOI: doi:10.1103/PhysRevB.95.035103
ISSN: 2469-9950
EISSN: 2469-9969
Type of Material: Journal Article
Journal/Proceeding Title: Physical Review B
Version: Author's manuscript

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