Streaming motion and population inversion of hot electrons in silver halides at crossed electric and magnetic fields
- 15 December 1979
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 20 (12), 5192-5216
- https://doi.org/10.1103/physrevb.20.5192
Abstract
Galvanomagnetic measurements on photocarriers in pure AgCl and AgBr have been extended to an intense electric field ( kV/cm) and high magnetic field ( kOe) at 4.2 K by using a fast-pulse technique. improved arrangements of blocking electrodes were adopted in order to detect simultaneously the three components of the transient photocurrent, , , and . Substantial roles of the LO-phonon emission in hot-electron kinetics have been revealed and clear pictures of the hot-electron phenomena in silver halides were obtained, for the first time, by a quantitative analysis of the results: (1) At , the momentum distribution of electrons (or holes) forms a line connecting the two points and , where , and the electrons are ideally streaming on the trajectory repeatingly emitting LO phonons. Hence, the electron drift velocity at high at is saturated to . (2) An anomalous distribution of hot electrons involving population inversion predicted by Maeda and Kurosawa, is realized by applying a moderately high such that , where . The distribution consists of two groups of electrons; the first group of electrons are streaming and the second group are accumulated within a high-energy area in momentum space. Depending on the electron accumulation in the area , the tangent of the Hall angle, and also increase abruptly with . (3) It was found that the electron trapping lifetime varies with and
Keywords
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