In‐plane effective masses and quantum scattering times of electrons in narrow modulation‐doped InGaAs/InP quantum wells

Autor:	U. Wiesner, A. Mesquida Kusters, A. Kohl, J. Pillath, S. Brittner, K. Heime, Wolfgang Bauhofer
Rok vydání:	1994
Předmět:	Electron mobility Effective mass (solid-state physics) Physics and Astronomy (miscellaneous) Condensed matter physics Chemistry Doping Scattering theory Electron Condensed Matter::Mesoscopic Systems and Quantum Hall Effect Quantum Shubnikov–de Haas effect Quantum well
Zdroj:	Applied Physics Letters. 64:2520-2522
ISSN:	1077-3118 0003-6951
DOI:	10.1063/1.111560
Popis:	In‐plane effective masses m*∥ and quantum scattering times are derived from temperature‐dependent Shubnikov–de Haas oscillations measured on a series of modulation‐doped InxGa1−xAs/InP quantum wells with x=0.53 and 0.75, and for well widths ranging from 3 to 7 nm. The values for m*∥ are consistently higher by 30%–70% than the respective bulk data. This result is in good agreement with recent theoretical calculations which predict an increase of m*∥ with decreasing well width. The scatter of the mass values for nominally identical quantum wells is assumed to reflect corresponding variations of the well widths. The ratio of quantum to classical scattering times and the carrier density dependence of the electron mobilities indicate that Coulomb scattering is important even in extremely narrow quantum wells.
Databáze:	OpenAIRE
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