论文标题
SB掺杂的BI2SE3拓扑绝缘子纳米管中的可调节量子干扰振荡
Adjustable quantum interference oscillations in Sb-doped Bi2Se3 topological insulator nanoribbons
论文作者
论文摘要
拓扑绝缘子（TI）纳米纤维（NRS）提供了一个独特的平台，用于研究量子干扰振荡与拓扑表面状态相结合的。沿TI NR周长形成的一维子带可以通过轴向磁场调节，该轴向磁场表现出Aharonov-Bohm（AB）和AltShuler-Aronov-Spivak（AAS）磁磁性（MC）的振荡。使用SB掺杂的BI2SE3 TI NRS，我们发现两个量子振荡的相对幅度可以通过改变通道长度来调节，从而表现出从准核管到扩散传输方案的交叉。即使对于70千分尺的通道，AB和AAS振荡也可以辨别，而对于短通道，仅观察到AB振荡。基于集合平均MC曲线的快速傅立叶变换的分析揭示了AB和AAS振荡的指数依赖性，从中获得了圆周相相位的长度和热长度。我们的观察结果表明，TINR中的通道长度可以是用于定制量子干扰振荡的有用控制旋钮，尤其是用于开发拓扑杂交量子设备。
Topological insulator (TI) nanoribbons (NRs) provide a unique platform for investigating quantum interference oscillations combined with topological surface states. One-dimensional subbands formed along the perimeter of a TI NR can be modulated by an axial magnetic field, exhibiting Aharonov-Bohm (AB) and Altshuler-Aronov-Spivak (AAS) oscillations of magnetoconductance (MC). Using Sb-doped Bi2Se3 TI NRs, we found that the relative amplitudes of the two quantum oscillations can be tuned by varying the channel length, exhibiting crossover from quasi-ballistic to diffusive transport regimes. The AB and AAS oscillations were discernible even for a 70 micrometer long channel, while only the AB oscillations were observed for a short channel. Analyses based on ensemble-averaged fast Fourier transform of MC curves revealed exponential temperature dependences of the AB and AAS oscillations, from which the circumferential phase-coherence length and thermal length were obtained. Our observations indicate that the channel length in a TI NR can be a useful control knob for tailored quantum interference oscillations, especially for developing topological hybrid quantum devices.
