Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
1998-04-04
Phys.Techn.Semicond.(in Russian) 32 (1998), 596-602
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
13 pages, 8 figures in EPS format; Physica Scripta (in print)
Scientific paper
10.1088/0031-8949/58/1/015
The transport relaxation time $\tau (P)$ and the mean free path of magnetoexcitons in single and coupled quantum wells are calculated ($P$ is the magnetic momentum of the magnetoexciton). We present the results for magnetoexciton scattering in a random field due to (i) quantum well width fluctuations, (ii) composite fluctuations and (iii) ionized impurities. The time $\tau(P)$ depends nonmonotonously on $P$ in the case (ii) and in the cases (i), (iii) for $D/l$ smaller than some critical value ($D$ is the interwell separation, $l=\sqrt{\hbar c/eH}$ is the magnetic length). For $D/l\gg 1$ the transport relaxation time increases monotonously with $P$. The magnetoexciton mean free path $\lambda (P)$ has a maximum at $P\ne 0$ in the cases (i), (iii). It decreases with increasing $D/l$. The mean free path calculated for the case (ii) may have two maxima. One of them disappears with the variation of the random fields parameters. The maximum of $\lambda (P)$ increases with $H$ for types (i,iii) of scattering processes and decreases in the case (ii).
Lozovik Yu. E.
Ruvinsky Anatoly M.
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