Indra Moumita, Mondal Sandip
Department of Electrical Engineering, Indian Institute of Technology (IIT) Bombay, Mumbai 400076, India.
J Phys Condens Matter. 2024 Feb 23;36(21). doi: 10.1088/1361-648X/ad2885.
We investigated the excitation spectra for the rotating Bose system in the fractional quantum Hall effect regime considering short-ranged Po¨schl-Teller and long-ranged Coulomb type interaction. We found the anomalous negative dispersion in the excited spectra for Jain's second and third series, whereas conventional spin-wave positive dispersion is observed in the case of Jain's first series. The higher order Jain series display negative curvature with roton minima at lower momenta and exhibit spin-wave excitation similar to conventional ferromagnets at higher momenta. This anomalous spin-flip excitonic state of particle-hole pairs arises due to the merging of two types of spin-reversed modes i.e. spin-wave with no change in Landau level (LL) index and spin-flip with decreasing LL index.
我们研究了分数量子霍尔效应区域中旋转玻色系统的激发光谱，考虑了短程的波施尔-泰勒相互作用和长程的库仑型相互作用。我们发现，在贾因第二和第三系列的激发光谱中存在反常的负色散，而在贾因第一系列的情况下观察到传统的自旋波正色散。高阶贾因系列在较低动量处具有负曲率且有旋子极小值，在较高动量处表现出类似于传统铁磁体的自旋波激发。这种粒子-空穴对的反常自旋翻转激子态是由于两种类型的自旋反转模式的合并而产生的，即朗道能级（LL）指数不变的自旋波和LL指数减小的自旋翻转。
