Occupation Modulation of Higher Subbands in a Three-Barrier Tunnelling Structure with a Magnetic Field

• 来源期刊: 中国物理快报（英文版）
• 学科: 物理学
• 年，卷（期）: 2002,（10）
• 页码范围: 1509-1512
• 页数: 4页
• 分类号: O4
• 语种: 英文

摘要

We verify that the magnetic suppression of intersubband LO or LA phonon scattering can give rise to a noticeablenonthermal occupation in higher-lying subbands. This is clearly determined by the relative intensity ratio of theinterband photoluminescence spectra for the E2 - HH1 and E1 - HH1 transitions. The observed phenomenonmay provide an effective method to control the intersubband scattering rate, which is a key factor of the so-calledquantum cascade lasers. This is helpful for the population inversion between both the subbands in quantumwells.