...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Solid-State Electronics >Excitons, spin-waves and Skyrmions in the optical spectra of a two dimensional electron gas
【24h】

Excitons, spin-waves and Skyrmions in the optical spectra of a two dimensional electron gas

机译：

获取原文
获取原文并翻译 | 示例
   

获取外文期刊封面封底 >>

       
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

We present a comprehensive study of photoluminescence (PL) mechanisms in high-quality GaAs/AlGaAs two dimensional electron gases (2DEGs) close to the integer quantum Hall state, v = 1. At this filling factor the lowest-energy spin-split electronLandau level (e↑) is fully occupied and the higher spin-state (e↓) empty. We demonstrate the Coulomb interaction between the 2DEG electrons and valence band (vb) hole has a crucial influence on the PL. This is elucidated by PL experiments on twodifferent types of sample where we can vary the electron-hole separation. In single quantum well (QW) structures with front and back depleting gates we are able to apply an electric field normal to the well, in order to polarise the hole wavefunctiontoward the opposite face of the well from the 2DEG. In double QWs, we study even larger separations where the 2DEG and hole are confined in neighbouring wells. Our results prove the existence of excitons formed between the hole and the charge excitationsof the 2DEG, i.e. quasi-particles or Skyrmions. For small electron-hole separations the Coulomb interaction is sufficiently strong to cause the spin reversal of a single 2DEG electron for V 1 ground state consisting of a Skyrmion bound tothe hole. The spectra also show shake-up structure due to the formation of spin-waves after recombination of an electron in the full spin-state.

著录项

相似文献

  • 外文文献
  • 中文文献
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号