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arXiv 0910.3846cond-mat.mes-hallcond-mat.supr-con
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CdBxF2-x - p-CdF2-CdBxF2-x三明治纳米结构中的自旋晶体管和量子自旋霍尔效应

Spin Transistor and Quantum Spin Hall Effects in CdBxF2-x - p-CdF2 - CdBxF2-x Sandwich Nanostructures

N. T. Bagraev, O. N. Guimbitskaya, L. E. Klyachkin, A. A. Kudryavtsev, A. M. Malyarenko, V. V. Romanov, A. I. Ryskin, I. A. Shelykh, A. S. Shcheulin

摘要:

研究了在n型CdF_2晶体表面制备的CdB_xF_2-x -p-CdF_2-CdB_xF_2-x三明治结构的自旋晶体管和量子自旋霍尔效应。超浅p+-n结的电流-电压特性验证了CdF 2的带隙为7.8 eV,以及由CdBxF 2-x δ势垒限制的p型CdF 2量子阱中的2D空穴的量子子带。电阻、比热和磁化率的温度和磁场依赖性表明CdBxF 2-x δ势垒具有高温超导体特性。用隧道能谱方法测得的超导体能隙值为102.06 meV,与二维空穴子带处超导态零电阻超导电流与正常态电导之间的关系符合得很好.所获得的结果是多个Andreev反射的重要作用的证据在创建的高自旋极化的2D孔在三明治装置的边缘通道。边缘沟道中的高自旋空穴极化被示出以识别自旋晶体管的机制和通过改变顶栅电压引起的量子自旋霍尔效应,这是由霍尔量子电导阶梯的首次观察所揭示的。

英文摘要:

Planar CdBxF2-x - p-CdF2 - CdBxF2-x sandwich nanostructures prepared on the surface of the n-type CdF2 bulk crystal are studied to register the spin transistor and quantum spin Hall effects. The current-voltage characteristics of the ultra-shallow p+-n junctions verify the CdF2 gap, 7.8 eV, and the quantum subbands of the 2D holes in the p-type CdF2 quantum well confined by the CdBxF2-x delta-barriers. The temperature and magnetic field dependencies of the resistance, specific heat and magnetic susceptibility demonstrate the high temperature superconductor properties for the CdBxF2-x delta-barriers. The value of the superconductor energy gap, 102.06 meV, determined by the tunneling spectroscopy method appears to be in a good agreement with the relationship between the zero-resistance supercurrent in superconductor state and the conductance in normal state at the energies of the 2D hole subbands. The results obtained are evidence of the important role of the multiple Andreev reflections in the creation of the high spin polarization of the 2D holes in the edged channels of the sandwich device. The high spin hole polarization in the edged channels is shown to identify the mechanism of the spin transistor and quantum spin Hall effects induced by varying the top gate voltage, which is revealed by the first observation of the Hall quantum conductance staircase.

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