Kang M, Pinczuk A, Dennis BS, Eriksson MA, Pfeiffer LN, West KW
Departments of Physics and of Applied Physics, Columbia University, New York, New York 10027 and Bell Labs, Lucent Technologies, Murray Hill, New Jersey 07974, USA.
Phys Rev Lett. 2000 Jan 17;84(3):546-9. doi: 10.1103/PhysRevLett.84.546.
We report observations of collective gap excitations of the fractional quantum Hall (FQH) states at filling factors nu = p/(2p+1) ( p = integer), for 1/3</=nu</=2/3, by inelastic light scattering. The collective gap energies at nu = 1/3, 2/5, and 3/7 show a drastic decrease as the value nu = 1/2 is approached. These energies and the one at nu = 3/5 display the linear scaling with (e(2)/epsilonl(0))/|2p+1| that is characteristic of composite fermions in Chern-Simons gauge fields. In a narrow range of nu centered at 1/2, where the FQH gaps collapse, we observe a new excitation mode which exists only at temperatures below 150 mK.
我们报告了通过非弹性光散射对填充因子ν = p/(2p + 1)（p为整数）的分数量子霍尔（FQH）态的集体能隙激发的观测结果，其中1/3≤ν≤2/3。在ν = 1/3、2/5和3/7处的集体能隙能量随着接近ν = 1/2的值而急剧下降。这些能量以及ν = 3/5处的能量呈现出与(e²/ε₀)/|2p + 1|的线性标度关系，这是陈 - 西蒙斯规范场中复合费米子的特征。在以1/2为中心的狭窄ν范围内，FQH能隙崩塌，我们观测到一种仅在温度低于150 mK时存在的新激发模式。
