Composite fermion states around the two-dimensional hole Landau level filling factor 3/2 in tilted magnetic fields
Composite fermion states around the two-dimensional hole Landau level filling factor 3/2 in tilted magnetic fields
复制标题
倾斜磁场中二维孔朗道能级填充因子 3/2 周围的复合费米子态
DOI：
10.1103/physrevb.95.155316
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发表时间：
2016
影响因子：
3.7
通讯作者：
K. West
中科院分区：
文献类型：
--
作者：
Po Zhang;Ruiyuan Liu;R. Du;L. Pfeiffer;K. West
对一系列C掺杂的（001）AlGaAs/GaAs/AlGaAs二维空穴样品进行了倾斜磁场下的输运测量。由于大的g因子，塞曼能量是大的并且与这些样品中的回旋能量相当。另一方面，发现面内分量g//很小，倾斜磁场的作用主要是增加空穴的有效质量。研究了复合费米子态在填充因子为3/2的朗道能级附近的自旋跃迁。我们发现{\nu} = 4/3态经历了部分到完全的自旋极化转变，符合与电子样品相同的模式。此外，在非常高的倾斜角下，在{\nu} = 3/2处出现高电阻相。我们解释这两种现象的结果，主要是由轨道效应驱动的LL交叉。我们将讨论自旋自由度在这些系统中{\nu} = 3/2附近的π H态中所起的作用。
Transport measurements under a tilted magnetic field were performed on a series of C-doped (001) AlGaAs/GaAs/AlGaAs two-dimensional hole samples. Due to a large g-factor, Zeeman energy is large and comparable to the cyclotron energy in these samples. On the other hand, it was found that the in-plane component g// is small, and the effect of tilted magnetic field is mainly to increase the effective mass of holes. We investigate the spin transition of composite fermion states around Landau level (LL) filling factor 3/2. We found that the {\nu} = 4/3 state encounters a partial to full spin polarization transition, conforming to the same pattern as that of electron samples. In addition, high-resistance phase emerges at {\nu} = 3/2 under very high tilt angles. We interpret both of these phenomena as a consequence of LL crossings that are mainly driven by the orbital effects. The roles that the spin degrees of freedom play in FQH states around {\nu} = 3/2 in these systems will be discussed.