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Shubnikov—de Haas oscillations, peaks and different temperature regimes of the diagonal conductivity in the integer quantum Hall conductor
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Shubnikov—de Haas oscillations, peaks and different temperature regimes of the diagonal conductivity in the integer quantum Hall conductor
Тема:
Письма pедактоpу
Інший ID:
PACS: 73.43.–f, 73.40.Gk, 75.47.–m
Посилання:
Shubnikov—de Haas oscillations, peaks and different
temperature regimes of the diagonal conductivity
in the integer quantum Hall conductor / V.M. Gvozdikov // Физика низких температур. — 2005. — Т. 31, № 7. — С. 826-831. — Бібліогр.: 19 назв. — англ.
Підтримка:
The work was supported by INTAS, project
INTAS-01-0791. The author is deeply gratitude to P.
Fulde, J. Wosnitza, M. Kartsovnik, W. Biberacher,
I.Ya. Polishchuk, I.V. Krive, A.M. Kosevich, A.A.
Slutskin and participants of the theoretical seminar at
FTINT in Kharkov for discussions and to S. Flach for
the hospitality at MPIPKS in Dresden.
Дата:
2005
Переглядів:
674
Завантажень:
494
Анотація:
A theory for the Shubnikov—de Haas oscillations in the diagonal conductivity σxx of a 2D conductor is developed for the case when electron states within the broaden Landau levels are localized except the narrow stripe in the center. The standard Shubnikov—de Haas oscillations take place only in the low-field region which at higher magnetic fields crosses over into peaks. In the limit Ωτ >> 1 peaks in the σxx became sharp and between them σxx → 0 (Ω is the cyclotron frequency, τ is the electron scattering time). The conductivity peaks display different temperature behavior with the decrease of temperature, T: a thermal activation regime, σxx exp(-Δ/T), which holds at higher temperatures, crosses over into the variable-range-hopping regime at lower temperatures with σxx 1/T exp(-√(Т₀/Т) (the prefactor 1/T is absent in the conductance).
