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Thz Radiation under Tunneling in Asymmetric Double Quatum Wells

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Author(s): Menberu Mengesha | Svetlana Koshvaya | Vadim Mal’nev

Journal: Journal of Electromagnetic Analysis and Applications
ISSN 1942-0730

Volume: 03;
Issue: 07;
Start page: 271;
Date: 2011;
Original page

Keywords: Double Quantum Well | Energy Splitting | Tunneling | Quantum Transitions

ABSTRACT
The asymmetric parabolic double quantum wells (DQWs) with resonant levels (the ground state energy in one well co-incides with the first excited state energy in another well) is analyzed. The splitting of these levels and the tunneling times are calculated. If the typical life time of the excited state is much smaller than the tunneling time between wells, the charged particle can radiate as a result of the quantum transition from the excited state to the ground state. In the opposite case, the asymmetric DQWs can be treated as a metastable excited nanosystem regardless of that the dipole transition from the excited state to ground state is permitted. The lifetime of this metastable state can be considerably reduced by putting it into a resonant cavity. The possibility of coherent radiation of an ensemble of asymmetric DQWS is discussed.
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