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Title: Effect of temperature on resonant electron transport through stochastic conduction channels in superlattices
Authors: Sel'skii, Anton O.
Koronovskii, Alexey A.
Hramov, Alexander E.
Moskalenko, Olga I.
Alekseev, Kirill N.
Greenaway, M.T.
Wang, F.
Fromhold, T.M.
Shorokhov, Aleksei V.
Khvastunov, Nikolai N.
Balanov, Alexander G.
Issue Date: 2011
Publisher: © American Physical Society
Citation: SEL'SKII, A.O., 2011. Effect of temperature on resonant electron transport through stochastic conduction channels in superlattices. Physical Review B - Condensed Matter and Materials Physics, 84 (23), 235311.
Abstract: We show that resonant electron transport in semiconductor superlattices with an applied electric and tilted magnetic field can, surprisingly, become more pronounced as the lattice and conduction electron temperature increases from 4.2 K to room temperature and beyond. It has previously been demonstrated that at certain critical field parameters, the semiclassical trajectories of electrons in the lowest miniband of the superlattice change abruptly from fully localized to completely unbounded. The unbounded electron orbits propagate through intricate web patterns, known as stochastic webs, in phase space, which act as conduction channels for the electrons and produce a series of resonant peaks in the electron drift velocity versus electric-field curves. Here, we show that increasing the lattice temperature strengthens these resonant peaks due to a subtle interplay between the thermal population of the conduction channels and transport along them. This enhances both the electron drift velocity and the influence of the stochastic webs on the current-voltage characteristics, which we calculate by making self-consistent solutions of the coupled electron transport and Poisson equations throughout the superlattice. These solutions reveal that increasing the temperature also transforms the collective electron dynamics by changing both the threshold voltage required for the onset of self-sustained current oscillations, produced by propagating charge domains, and the oscillation frequency.
Description: This paper was accepted for publication in the journal Physical Review B - Condensed Matter and Materials Physics and the definitive published version is available at http://dx.doi.org/10.1103/PhysRevB.84.235311.
Sponsor: The work was supported by the Federal special purpose programme “Scientific and educational personnel of innovation Russia (2009 - 2013)”, the UK Engineering and Physical Sciences Research Council and the “Dynasty” Foundation.
Version: Accepted for publication
DOI: 10.1103/PhysRevB.84.235311
URI: https://dspace.lboro.ac.uk/2134/26040
Publisher Link: http://dx.doi.org/10.1103/PhysRevB.84.235311
ISSN: 1098-0121
Appears in Collections:Published Articles (Physics)

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