Single crystalline β-Ag 2Te nanowire as a new topological insulator

Sunghun Lee, Juneho In, Youngdong Yoo, Younghun Jo, Yun Chang Park, Hyung Jun Kim, Hyun Cheol Koo, Jinhee Kim, Bongsoo Kim, Kang L. Wang

研究成果: Article同行評審

61 引文 斯高帕斯(Scopus)

摘要

A recent theoretical study suggested that Ag 2Te is a topological insulator with a highly anisotropic Dirac cone. Novel physics in the topological insulators with an anisotropic Dirac cone is anticipated due to the violation of rotational invariance. From magnetoresistance (MR) measurements of Ag 2Te nanowires (NWs), we have observed Aharanov-Bohm (AB) oscillation, which is attributed to the quantum interference of electron phase around the perimeter of the NW. Angle and temperature dependences of the AB oscillation indicate the existence of conducting surface states in the NWs, confirming that Ag 2Te is a topological insulator. For Ag 2Te nanoplates (NPLs), we have observed high carrier mobility exceeding 22 000 cm 2/(V s) and pronounced Shubnikov-de Haas (SdH) oscillation. From the SdH oscillation, we have obtained Fermi state parameters of the Ag 2Te NPLs, which can provide valuable information on Ag 2Te. Understanding the basic physics of the topological insulator with an anisotropic Dirac cone could lead to new applications in nanoelectronics and spintronics.

原文English
頁(從 - 到)4194-4199
頁數6
期刊Nano letters
12
發行號8
DOIs
出版狀態Published - 2012 八月 8

All Science Journal Classification (ASJC) codes

  • 生物工程
  • 化學 (全部)
  • 材料科學(全部)
  • 凝聚態物理學
  • 機械工業

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