Terahertz ballistic current oscillations for carriers with negative effective mass

Autor:	A. N. Korshak, Nizami Vagidov, Z. S. Gribnikov
Rok vydání:	1996
Předmět:	Physics Amplitude Effective mass (solid-state physics) Condensed matter physics Oscillation Terahertz radiation Dispersion relation General Physics and Astronomy Condensed Matter::Mesoscopic Systems and Quantum Hall Effect Current density Quantum well Diode
Zdroj:	Journal of Applied Physics. 80:5799-5808
ISSN:	1089-7550 0021-8979
DOI:	10.1063/1.363572
Popis:	It is shown that the stationary distribution of ballistic current carriers moving across a thin doped base is unstable if there exists a negative effective mass (NEM) part in the carrier dispersion law. Under such a condition, a regime with a quasistationary current oscillations is established for a wide range of voltages across ballistic diode. The oscillation frequency and amplitude depend on the base length, doping concentration, and applied voltage. The current oscillations take place in a short‐circuit regime (in absence of an external resonator). We consider asymmetric double quantum wells and/or composite ΓX quantum wells as possible structures allowing for the required dispersion relation with NEM part. Carrier dynamics in these structures are described quasiclassically and the validity of such a treatment is discussed.
Databáze:	OpenAIRE
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