Aharonov-Bohm interference and colossal magnetoresistance in anisotropic topological insulator Beta-Ag2Te

Details Aharonov-Bohm interference and colossal magnetoresistance in anisotropic topological insulator Beta-Ag2Te Aharonov-Bohm interference and colossal magnetoresistance in anisotropic topological insulator Beta-Ag2Te

2012-04-17

arxiv.org/abs/1204.3816v4

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

20 pages, 4 figures

Scientific paper

We present experimental evidence of topological surface states in beta-Ag2Te through periodic quantum interference effect. Coexistence of pronounced Aharonov-Bohm oscillations and weak Altshuler-Aronov-Spivak oscillations clearly demonstrates coherent electron transport around the perimeter of beta-Ag2Te nanoplate and therefore existence of metallic surface states. The existence of surface states is further supported by the temperature dependence of resistivity for beta-Ag2Te nanoplates with different cross section areas. Moreover, by comparing the temperature dependent magnetoresistance of two single crystalline beta-Ag2Te nanoplates with different cross section areas and the results of polycrystalline samples in literatures, we propose that the linear colossal magnetoresistance of beta-Ag2Te may mainly come from the bulk. Angular dependent magnetoresistance of beta-Ag2Te also indicates that linear magnetoresistance and two-dimensional magnetoresistance behavior may not secure a surface state. Coexistence of colossal magnetoresistance and topological surface suggests that beta-Ag2Te is a topological insulator, and also a promising material for fundamental study and future spintronic devices.

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