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Mechanism of resonant enhancement of electron drift in nanometer semiconductor superlattices subjected to electric and inclined magnetic fields
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Soskin, Stanislav M., Khovanov, Igor A. and McClintock, Peter V. E. (2019) Mechanism of resonant enhancement of electron drift in nanometer semiconductor superlattices subjected to electric and inclined magnetic fields. Physical Review B (Condensed Matter and Materials Physics), 100 (23). 235203. doi:10.1103/PhysRevB.100.235203 ISSN 1098-0121.
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Official URL: http://dx.doi.org/10.1103/PhysRevB.100.235203
Abstract
We address the increase of electron drift velocity that arises in semiconductor superlattices (SLs) subjected to constant electric and magnetic fields. It occurs if the magnetic field possesses nonzero components both along and perpendicular to the SL axis and the Bloch oscillations along the SL axis become resonant with cyclotron rotation in the transverse plane. It is a phenomenon of considerable interest, so that it is important to understand the underlying mechanism. In an earlier paper [Phys. Rev. Lett. 114, 166802 (2015)], we showed that, contrary to a general belief that drift enhancement occurs through chaotic diffusion along a stochastic web (SW) within semiclassical collisionless dynamics, the phenomenon actually arises through a nonchaotic mechanism. In fact, any chaos that occurs tends to reduce the drift. We now provide fuller details, elucidating the mechanism in physical terms, and extending the investigation. In particular, we (i) demonstrate that pronounced drift enhancement can still occur even in the complete absence of an SW; (ii) show that, where an SW does exist and its characteristic slow dynamics comes into play, it suppresses the drift enhancement even before strong chaos is manifested; (iii) generalize our theory for nonsmall temperature, showing that heating does not affect the enhancement mechanism and accounting for some earlier numerical observations; (iv) demonstrate that certain analytic results reported previously are incorrect; (v) provide an extended critical review of the subject and closely related issues; and (vi) discuss some challenging problems for the future.
Item Type: | Journal Article | |||||||||||||||
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Subjects: | Q Science > QC Physics T Technology > T Technology (General) T Technology > TK Electrical engineering. Electronics Nuclear engineering |
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Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | |||||||||||||||
Library of Congress Subject Headings (LCSH): | Superlattices as materials, Electron transport , Nanoelectronics, Superlattices as materials -- Electric properties , Superlattices as materials -- Magnetic properties, Semiconductors | |||||||||||||||
Journal or Publication Title: | Physical Review B (Condensed Matter and Materials Physics) | |||||||||||||||
Publisher: | American Physical Society | |||||||||||||||
ISSN: | 1098-0121 | |||||||||||||||
Official Date: | 23 December 2019 | |||||||||||||||
Dates: |
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Volume: | 100 | |||||||||||||||
Number: | 23 | |||||||||||||||
Article Number: | 235203 | |||||||||||||||
DOI: | 10.1103/PhysRevB.100.235203 | |||||||||||||||
Status: | Peer Reviewed | |||||||||||||||
Publication Status: | Published | |||||||||||||||
Access rights to Published version: | Open Access (Creative Commons) | |||||||||||||||
Date of first compliant deposit: | 8 January 2020 | |||||||||||||||
Date of first compliant Open Access: | 16 January 2020 | |||||||||||||||
RIOXX Funder/Project Grant: |
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