Landau-level populations and slow energy relaxation of a two-dimensional electron gas probed by tunneling spectroscopy.
Landau-level populations and slow energy relaxation of a two-dimensional electron gas probed by tunneling spectroscopy.
复制标题
通过隧道光谱探测二维电子气的朗道能级布居和缓慢能量弛豫。
DOI：
10.1103/physrevb.52.4666
复制
发表时间：
1995
期刊：
影响因子：
--
通讯作者：
Henini
中科院分区：
文献类型：
--
作者：
Neves;Môri;Beton;Eaves;Wang;Henini
在接近共振隧穿阈值的电压范围内，研究了平行于电流方向的磁场对双势垒GaAsAlAs异质结器件的隧穿电流的影响。随着朗道量子数的变化，电流中的附加峰值对应于从发射极-累积层到量子阱的隧道跃迁。数据分析表明，发射极蓄积层最低的两个朗道能级的电子布居远离热平衡。在≥4T场，这些能级之间的朗道能级间跃迁时间估计超过100 ns。
The tunnel current in a double-barrier GaAs/AlAs heterostructure device is investigated in the voltage range close to the threshold for resonant tunneling and as a function of magnetic field applied parallel to the current direction. Additional peaks in the current are observed that correspond to tunneling transitions from the emitter-accumulation layer to the quantum well with a change of Landau quantum number. Analysis of the data indicates that the electron population in the two lowest Landau levels of the emitter-accumulation layer is far from thermal equilibrium. The inter-Landau-level transition time between these levels is estimated to be in excess of 100 ns at fields≥ 4 T.