Weak antilocalization in HgTe quantum wells with inverted energy spectra / Minkov G. M.,Germanenko A. V.,Rut O. E.,Sherstobitov A. A.,Dvoretski S. A.,Mikhailov N. N. // PHYSICAL REVIEW B. - 2012. - V. 85, l. 23.

ISSN/EISSN:

1098-0121 / нет данных

Type:

Article

Abstract:

The results of an experimental study of the magnetoconductivity of two-dimensional (2D) electron gas caused by suppression of the interference quantum correction in a HgTe single quantum well heterostructure with an inverted energy spectrum are presented. It is shown that only the antilocalization magnetoconductivity is observed at relatively high conductivity, sigma > (20-30) G(0), where G(0) = e(2)/2 pi(2)(h) over bar. The antilocalization correction demonstrates a crossover from 0.5 ln(tau(phi)/tau) to 1.0 ln(tau(phi)/tau) behavior with increasing conductivity (here tau(phi) and tau are the phase relaxation and transport relaxation times, respectively). It is interpreted as a result of crossover to the regime when the two chiral branches of the electron energy spectrum independently contribute to the weak antilocalization. At lower conductivity, sigma < (20-30) G(0), the magnetoconductivity behaves similarly to that in usual 2D systems with fast spin relaxation: It is negative in low magnetic fields and positive in higher ones. We have found that the temperature dependences of the fitting parameter tau(phi) corresponding to the phase relaxation time demonstrate reasonable behavior, close to 1/T, over the whole conductivity range from 5 G(0) up to 130 G(0). However, the tau(phi) value remains practically independent of conductivity, in contrast to conventional 2D systems with simple energy spectra, in which tau(phi) is enhanced with conductivity.

Author keywords:

SPIN-ORBIT INTERACTION; ELECTRONIC SYSTEMS; INTERFACE STATES; TRANSITION; PHASE; MAGNETORESISTANCE; SEMICONDUCTOR; HG1-XCDXTE; GRAPHENE; BAND

DOI:

10.1103/PhysRevB.85.235312

Web of Science ID:

ISI:000305251900008

Соавторы в МНС:

Другие поля

Поле	Значение
Month	JUN 14
Publisher	AMER PHYSICAL SOC
Address	ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA
Language	English
Article-Number	235312
Keywords-Plus	SPIN-ORBIT INTERACTION; ELECTRONIC SYSTEMS; INTERFACE STATES; TRANSITION; PHASE; MAGNETORESISTANCE; SEMICONDUCTOR; HG1-XCDXTE; GRAPHENE; BAND
Research-Areas	Physics
Web-of-Science-Categories	Physics, Condensed Matter
ResearcherID-Numbers	Sherstobitov, Andrey/K-3838-2013 Minkov, Grigory/K-3855-2013
ORCID-Numbers	Sherstobitov, Andrey/0000-0001-9267-4181 Minkov, Grigory/0000-0001-8090-5309
Funding-Acknowledgement	RFBR {[}10-02-91336, 10-02-00481, 12-02-00098]
Funding-Text	We thank I. V. Gornyi and I. S. Burmistrov for illuminating discussions. This work has been supported in part by the RFBR (Grants No. 10-02-91336, No. 10-02-00481, and No. 12-02-00098).
Number-of-Cited-References	44
Usage-Count-Last-180-days	2
Usage-Count-Since-2013	19
Journal-ISO	Phys. Rev. B
Doc-Delivery-Number	958PG