Two-dimensional semimetal in a wide HgTe quantum well: Magnetotransport and energy spectrum / Minkov G. M.,Germanenko A. V.,Rut O. E.,Sherstobitov A. A.,Dvoretski S. A.,Mikhailov N. N. // PHYSICAL REVIEW B. - 2013. - V. 88, l. 15.

ISSN/EISSN:

1098-0121 / 1550-235X

Type:

Article

Abstract:

The results of an experimental study of the magnetoresistivity and the Hall and Shubnikov-de Haas effects for a heterostructure with a HgTe quantum well of 20.2 nm width are reported. The measurements were performed on gated samples over a wide range of electron and hole densities including the vicinity of a charge neutrality point. Analyzing the data, we conclude that the electron and hole energy spectra are in qualitative agreement with those calculated within the framework of k P model. The electron and hole subbands are overlapped due to the nonmonotonic dispersion of the hole subband resulting in a semimetallic state. The main result of the paper, however, is the drastic quantitative difference in the experimental and calculated spectra of the hole subband. So, the hole effective mass found from the analysis of the Shubnikov-de Haas oscillations is positive and equal to approximately 0.2m(0) and practically independent of the quasimomentum (k) starting from k(2) similar or equal to 0.7 x 10(12) cm(-2), while the theory predicts negative (electronlike) effective mass up to k(2) similar or equal to 6 x 10(12) cm(-2). The experimental effective mass near k = 0, where the hole energy spectrum is electronlike, is close to -0.005m(0), whereas the theoretical value is about -0.1m(0).

Author keywords:

VALENCE-BAND; SEMICONDUCTORS; TRANSPORT; STATES

DOI:

10.1103/PhysRevB.88.155306

Web of Science ID:

ISI:000325501400002

Соавторы в МНС:

Другие поля

Поле	Значение
Month	OCT 9
Publisher	AMER PHYSICAL SOC
Address	ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA
Language	English
Article-Number	155306
EISSN	1550-235X
Keywords-Plus	VALENCE-BAND; SEMICONDUCTORS; TRANSPORT; STATES
Research-Areas	Physics
Web-of-Science-Categories	Physics, Condensed Matter
ResearcherID-Numbers	Sherstobitov, Andrey/K-3838-2013
ORCID-Numbers	Sherstobitov, Andrey/0000-0001-9267-4181
Funding-Acknowledgement	RFBR {[}11-02-12126, 12-02-00098, 13-02-00322]
Funding-Text	This work has been supported in part by the RFBR (Grant Nos. 11-02-12126, 12-02-00098, and 13-02-00322).
Number-of-Cited-References	32
Usage-Count-Since-2013	12
Journal-ISO	Phys. Rev. B
Doc-Delivery-Number	232NT