EVIDENCE FOR A PHASE-TRANSITION IN THE FRACTIONAL QUANTUM HALL-EFFECT
EVIDENCE FOR A PHASE-TRANSITION IN THE FRACTIONAL QUANTUM HALL-EFFECT
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DOI：
10.1103/physrevlett.62.1540
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发表时间：
1989-03-27
影响因子：
8.6
通讯作者：
WEST, KW
中科院分区：
文献类型：
--
作者：
EISENSTEIN, JP;STORMER, HL;WEST, KW
我们观察到了具有相同填充分数ν=(8/5)的不同分数量子霍尔态之间的一种新的跃迁。这种跃迁是通过使二维电子-气体样品相对于外部磁场倾斜来驱动的，表现为测量的激活能随倾斜角的急剧变化。在最初的下降之后，当倾角超过约30时，激活能突然开始增加。这些结果的一个看似合理的模型意味着从小角度的自旋非极化量子流体到高角度的极化量子流体的转变。
We observe a novel transition between distinct fractional quantum Hall states sharing the same filling fraction ν=(8/5. The transition is driven by tilting the two-dimensional electron-gas sample relative to the external magnetic field and is manifested by a sharp change in the dependence of the measured activation energy on tilt angle. After an initial decline, the activation energy abruptly begins to increase as the tilt angle exceeds about 30. A plausible model for these results implies a transition from a spin-unpolarized quantum fluid at small angles to a polarized one at higher angles.