Intersubband Elementary Excitations of Quasi-Two-Dimensional Electron Systems in Quantum-Well

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概要

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• Theoretical study is made for the dispersion relation and for the spectra of intersubband elementary excitations in the quasi-two dimensional electron gas of GaAs/Al-GaAs quantum well. Density-density correlation functions appearing in expressions for transition probabilities are calculated by means of the perturbation expansion with respect to the Coulomb interactions between electrons in the conduction sub-bands. From the calculated results, at long-wavelength limit the effects of the attractive Coulomb interactions between electrons and holes on the energy shift of the collective excitations from the single-particle excitations are shown to be comparable to the depolarization effects. The peak positions of the collective charge- and spin-density excitations in spectra are in qualitative agreement with the recent experimental findings.

• 社団法人日本物理学会の論文
• 1994-01-15

著者

• Okiji Ayao

  Department Of Aplied Physics Faculty Of Engineering Osaka University

• Suga Seiichiro

  Department of Applied Physics, Osaka University

• Kumada Seiya

  Department Of Applied Physics Osaka University

• Suga Seiichiro

  Department Of Applied Physics Osaka University

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