Capacitive detection of magnetic field induced quantum phase transitions in an imbalanced bilayer electron system
Capacitive detection of magnetic field induced quantum phase transitions in an imbalanced bilayer electron system
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不平衡双层电子系统中磁场引起的量子相变的电容检测
DOI：
10.1103/physrevb.102.235307
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发表时间：
2020
影响因子：
3.7
通讯作者：
J. Smet
中科院分区：
文献类型：
--
作者：
S. I. Dorozhkin;A. Kapustin;I. Fedorov;V. Umansky;J. Smet
使用磁电容技术探索由双门宽 GaAs 量子阱托管的不平衡双层电子系统中的量子磁场中出现的基态，该技术能够单独检测每层的可压缩性、电荷分布的表征以及单层或双层类行为的区别。对于总填充物 1 和 2，在可压缩双层基态和单层不可压缩相之间观察到磁场诱导的重入量子相变。这种转变伴随着整个阱的电荷重新分布。我们的观察表明，这两种不可压缩状态都以易平面赝自旋铁磁性为起源。
Ground states that appear in a quantizing magnetic field in an imbalanced bilayer electron system hosted by a dual-gated, wide GaAs quantum well are explored with a magnetocapacitance technique that enables detection of the compressibility of each layer separately, the characterization of the charge distribution, as well as the distinction of single- or double-layer-like behavior. Magnetic field induced reentrant quantum phase transitions are observed between a compressible double-layer ground state and a single-layer-like incompressible phase for both total fillings 1 and 2. The transitions are accompanied by a charge redistribution across the well. Our observations indicate for both incompressible states easy-plane pseudospin ferromagnetism as the origin.