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2 Acta Physica Polonica A

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Coherent and Sequential Tunneling in High Magnetic Field

100%

Belyaev A. E. , Vitusevich S. A. , Maude D. , Portal J. C.

Acta Physica Polonica A

1997

tom 92

nr 4

704-708

In the resonant tunneling diode incorporating a wide one-sided spacer layer, an oscillation picture has been studied in both polarities of the applied voltage in high magnetic field. The results lead to the conclusion that the interference between the electron waves running in the forward direction and the ones reflected at some potential step can occur in both the emitter and collector regions. The characteristic lengths corresponding to the path of the ballistic motion of electrons were estimated. An exchange enhancement of the electronic g-factor in two-dimensional systems was observed.

Effect of Magnetic Field on Fine Structure of Tunnel Current in Double-Barrier Resonant-Tunneling Devices

88%

Belyaev A. E. , Vitusevich S. A. , Glavin B. A. , Mąkosa A. , Dobrowolski W.

Acta Physica Polonica A

1995

tom 88

nr 4

675-678

An effect of magnetic field on a fine oscillatory structure revealed in the resonant current flowing through double-barrier resonant-tunneling devices is examined. It is found that the observed variation of the fine structure in a magnetic field parallel to the current direction differs considerably from that appearing in tunnel current flowing through single-barrier structures. Experimental results are explained in terms of the quantum interference effect arising in structures having wide spacer layers.