THE ELECTRIC SUB-BAND STRUCTURE OF ELECTRON ACCUMULATION LAYERS IN INSE FROM SHUBINKOV-DEHAAS OSCILLATIONS AND INTER-SUB-BAND RESONANCE
THE ELECTRIC SUB-BAND STRUCTURE OF ELECTRON ACCUMULATION LAYERS IN INSE FROM SHUBINKOV-DEHAAS OSCILLATIONS AND INTER-SUB-BAND RESONANCE
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DOI：
10.1088/0022-3719/16/21/027
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发表时间：
1983-01-01
期刊：
影响因子：
--
通讯作者：
CHEVY, A
中科院分区：
文献类型：
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作者：
KRESSROGERS, E;HOPPER, GF;CHEVY, A
在通过Bridgman法生长的体InSe晶体中，在堆垛层错附近形成电子累积层，其中带电杂质吸附到缺陷面。Shubnikov-de哈斯实验表明，在低温下观察到的InSe中的2D电子气具有10 - 12 cm-2的密度，并且几个介电子带被占据。g因子通过电子-电子相互作用而增强。研究了在垂直和倾斜磁场中3-20 meV频率范围内的光吸收，磁场强度可达8 T。对于平行极化和倾斜极化，均观察到E res= h（交叉）欧米茄c处的回旋共振、E res = E 01处的子带间共振以及E res= E 01+ h（交叉）欧米茄c处的组合共振，其中E 01等于从Shubnikov-de哈斯周期推导出的子带间隔。随着磁场的增加，激子和去极化位移共振E01接近真正的子带分裂E01，同时在幅度上减小。还观察到由于体1 s-2 p跃迁在孤立的浅施主的吸收。在30- 100 K的温度下，2 p能级显示了具有弱异常质量各向异性的三维塞曼分裂（h（交叉）ω c）3D，如在体载流子的回旋共振测量中所观察到的。有效电子里德伯态与激子谱的结果一致。
In bulk InSe crystals grown by the Bridgman method, electron accumulation layers are formed in the vicinity of stacking faults with charged impurities adsorbed to the defect plane. Shubnikov-de Haas experiments show that the 2D electron gas in InSe observed at low temperatures has a density of 10 12 cm-2 and that several dielectric sub-bands are occupied. The g-factor is enhanced by electron-electron interactions. The optical absorption was studied in the frequency range 3-20 meV in perpendicular and tilted magnetic fields up to 8T. The cyclotron resonance at E res= h (cross) omega c, the intersubband resonance at E res= E 01 and the combined resonance at E res= E 01+ h (cross) omega c, are all observed for both parallel and tilted polarisation, where E 01 is equal to the sub-band separation as deducted from the Shubnikov-de Haas periodicities. With increasing magnetic fields the exciton-and depolarisation-shifted resonance E 01 approaches the true sub-band splitting E 01, and is the same time reduced in amplitude. Absorption due to bulk 1s-2p transitions in isolated shallow donors is also observed. The 2p level shows a three-dimensional Zeeman splitting (h (cross) omega c) 3D with a weak anomalous mass anisotropy as observed in cyclotron resonance measurements of bulk carriers at temperatures of 30-100K. The effective electronic Rydberg is in agreement with results of exciton spectra.