Semiconductor HeterostructuresNo Access

TERAHERTZ BLOCH OSCILLATOR WITH SUPPRESSED ELECTRIC DOMAINS: EFFECT OF ELASTIC SCATTERING

TIMO HYART

Department of Physical Sciences, P.O. Box 3000, University of Oulu FI-90014, Finland

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KIRILL N. ALEKSEEV

Department of Physics, Loughborough University, LE11 3TU, UK

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AHTI LEPPÄNEN

Department of Physical Sciences, P.O. Box 3000, University of Oulu FI-90014, Finland

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, and

ERKKI V. THUNEBERG

Department of Physical Sciences, P.O. Box 3000, University of Oulu FI-90014, Finland

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https://doi.org/10.1142/S0217979209063596Cited by:5 (Source: Crossref)

Abstract

We theoretically consider the amplification of THz radiation in a superlattice Bloch oscillator. The main dilemma in the realization of THz Bloch oscillator is finding operational conditions which allow simultaneously to achieve gain at THz frequencies and to avoid destructive space-charge instabilities. A possible solution to this dilemma is the extended Limited Space-Charge Accumulation scheme of Kroemer (H. Kroemer, cond-mat/0009311). Within the semiclassical miniband transport approach we extend its range of applicability by considering a difference in the relaxation times for electron velocity and electron energy. The kinetics of electrons and fields establishing a stationary signal in the oscillator is also discussed.

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