Magnetic-field-controlled electron dynamics in quantum cavities
Magnetic-field-controlled electron dynamics in quantum cavities
复制标题
量子腔中磁场控制的电子动力学
DOI：
10.1103/physrevb.62.10255
复制
发表时间：
2000
影响因子：
3.7
通讯作者：
Y. Ochiai
中科院分区：
文献类型：
--
作者：
Y. Takagaki;M. Elhassan;A. Shailos;C. Prasad;J. Bird;D. Ferry;K. Ploog;L.;N. Aoki;Y. Ochiai
尽管电子在弹道腔中的软约束产生了经典概率分布的幂律，但如果势不是基本上平滑的，则行为仅限于变量的狭窄范围。垂直于腔体的磁场的存在通过生成分层相空间结构来扩展幂律范围。通过分析由高迁移率异质结上的静电门定义的量子腔中的电导波动，实验证实了磁场引起的动力学变化。当回旋加速器半径与腔尺寸相当时，作为零磁场下栅极偏置函数的非分形电导波动将转换为分形。
Although soft confinement of electrons in ballistic cavities gives rise to a power law of classical probability distributions, the behavior is limited to a narrow range of the variable if the potential is not substantially smooth. The presence of a magnetic field normal to the cavity extends the power-law regime by generating a hierarchical phase space structure. The change in dynamics induced by the magnetic field is confirmed experimentally through analysis of conductance fluctuations in quantum cavities defined by electrostatic gates on a high-mobility heterojunction. Nonfractal conductance fluctuations as a function of the gate bias at zero magnetic field are transformed to be fractal when the cyclotron radius is comparable to the cavity size.