...
首页> 外文期刊>Physical review >Dimensional crossover of the dephasing time in disordered mesoscopic rings
【24h】

Dimensional crossover of the dephasing time in disordered mesoscopic rings

机译:无序介观环中相移时间的维度交叉

获取原文
获取原文并翻译 | 示例
           

摘要

We study dephasing by electron interactions in a small disordered quasi-one-dimensional (1D) ring weakly coupled to leads. We use an influence functional for quantum Nyquist noise to describe the crossover for the dephasing time τ_φ(T) from diffusive or ergodic 1D (τ_φ~(-1)∝T~(2/3),T~1) to zero-dimensional (0D) behavior (τ_φ~(-1)∝ T~2) as T drops below the Thouless energy. The crossover to 0D, predicted earlier for two-dimensional and three-dimensional systems, has so far eluded experimental observation. The ring geometry holds promise of meeting this long-standing challenge, since the crossover manifests itself not only in the smooth part of the magnetoconductivity but also in the amplitude of Altshuler-Aronov-Spivak oscillations. This allows signatures of dephasing in the ring to be cleanly extracted by filtering out those of the leads.
机译:我们研究弱耦合到引线的小型无序准一维(1D)环中电子相互作用引起的相移。我们使用影响量子奈奎斯特噪声的影响函数来描述相移时间τ_φ(T)从扩散或遍历一维(τ_φ〜(-1)∝T〜(2/3),T〜1)到零维的交叉(0D)行为(τ_φ〜(-1)∝ T〜2),当T降至Thouless能量以下时。迄今为止,对二维和三维系统的0D转换进行了预测,目前尚无法进行实验观察。环的几何形状有望解决这一长期挑战,因为分频不仅表现在磁导率的平滑部分,而且表现在Altshuler-Aronov-Spivak振荡的幅度上。这样就可以通过滤掉引线中的相移来干净地提取出环中移相的标志。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
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