arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1707.05024cond-mat.mes-hall
收藏

准弹道狄拉克半金属纳米线表面态的门控Aharonov-Bohm干涉

Gate-tuned Aharonov-Bohm interference of surface states in a quasi-ballistic Dirac semimetal nanowire

Ben-Chuan Lin, Shuo Wang, Li-Xian Wang, Cai-Zhen Li, Jin-Guang Li, Dapeng Yu, Zhi-Min Liao

摘要:

本文报道了在准弹道Cd_3As_2纳米线中观察到的表面载流子的拓扑保护输运,该纳米线足够薄,使得自旋织构的表面载流子形成一维子带,即使没有磁场,也表现出电导随栅极电压的振荡.通过连续调节栅压,可以使Aharonov-Bohm振荡的π相移周期性地出现或消失。这种由Berry相位引起的π相移证明了表面态的拓扑性质,四端非局域测量进一步揭示了表面态的拓扑保护输运.

英文摘要:

We report an observation of a topologically protected transport of surface carriers in a quasi-ballistic Cd3As2 nanowire.The nanowire is thin enough for the spin-textured surface carriers to form 1D subbands, demonstrating conductance oscillations with gate voltage even without magnetic field. The π phase-shift of Aharonov-Bohm oscillations can periodically appear or disappear by tuning gate voltage continuously. Such a π phase shift stemming from the Berry's phase demonstrates the topological nature of surface states.The topologically protected transport of the surface states is further revealed by four-terminal nonlocal measurements.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑