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

Research output: Contribution to journalArticle

55 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)4194-4199
Number of pages6
JournalNano Letters
Volume12
Issue number8
DOIs
Publication statusPublished - 2012 Aug 8
Externally publishedYes

Keywords

  • Ag Te
  • Aharanov-Bohm oscillation
  • Anisotropic topological insulator
  • Shubnikov-de Haas oscillation
  • nanoplate
  • nanowire

ASJC Scopus subject areas

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering

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