Single Crystalline 尾-Ag2Te Nanowire as a New Topological Insulator

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• 作者：Sunghun Lee ; Juneho In ; Youngdong Yoo ; Younghun Jo ; Yun Chang Park ; Hyung-jun Kim ; Hyun Cheol Koo ; Jinhee Kim ; Bongsoo Kim ; Kang L. Wang
• 刊名：Nano Letters
• 出版年：2012
• 出版时间：August 8, 2012
• 年：2012
• 卷：12
• 期：8
• 页码：4194-4199
• 全文大小：419K
• 年卷期：v.12,no.8(August 8, 2012)
• ISSN：1530-6992

文摘

A recent theoretical study suggested that Ag₂Te 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 Ag₂Te nanowires (NWs), we have observed Aharanov鈥揃ohm (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 Ag₂Te is a topological insulator. For Ag₂Te nanoplates (NPLs), we have observed high carrier mobility exceeding 22鈥?00 cm²/(V s) and pronounced Shubnikov鈥揹e Haas (SdH) oscillation. From the SdH oscillation, we have obtained Fermi state parameters of the Ag₂Te NPLs, which can provide valuable information on Ag₂Te. Understanding the basic physics of the topological insulator with an anisotropic Dirac cone could lead to new applications in nanoelectronics and spintronics.

Keywords:

Anisotropic topological insulator; Ag₂Te; nanowire; nanoplate; Aharanov鈭払ohm oscillation; Shubnikov鈭抎e Haas oscillation