Direct observation of Lévy flights of holes in bulk n-doped InP

نویسندگان

  • Serge Luryi
  • Oleg Semyonov
  • Arsen Subashiev
  • Zhichao Chen
چکیده

We study the photoluminescence spectra excited at an edge side of n-InP slabs and observed from the broadside. In a moderately doped sample the intensity drops off as a power-law function of the distance from the excitation—up to several millimeters—with no change in the spectral shape. The hole distribution is described by a stationary Lévy-flight process over more than two orders of magnitude in both the distance and hole concentration. For heavily doped samples, the power law is truncated by free-carrier absorption. Our experiments are nearly perfectly described by the Biberman-Holstein transport equation with parameters found from independent optical experiments.

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تاریخ انتشار 2012