Large reduction of the Gunn-effect threshold field in a strong magnetic field
Andronov A. A., Valov V. A., Kozlov V. A. , Mazov L. S.
The results of numerical experiments to investigate the intervalley transport of hot electrons in η -GaAs in a strong magnetic field are presented. A strong magnetic field (В ~ 50 kG) reduces the threshold field of the decreasing portion of the volt-ampere (V-A) characteristic and the Gunn effect in long, pure samples by more than a factor of 2 at a temperature Τ — 77 К. It is established that this is a consequence of the "runaway" electron energy in a strong magnetic field, which is caused by the strong Hall field in the sample.
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![](/ps/1434/article_21815_800_head.png "The results of numerical experiments to investigate the intervalley transport of hot electrons in <b><i>η </i></b>-GaAs in a strong magnetic field are presented. A strong magnetic field <b><i>(В ~ </i></b>50 kG) reduces the threshold field of the decreasing portion of the volt-ampere (V-A) characteristic and the Gunn effect in long, pure samples by more than a factor of 2 at a temperature <b><i>Τ — </i></b>77 К. It is established that this is a consequence of the "runaway" electron energy in a strong magnetic field, which is caused by the strong Hall field in the sample.")