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Ultraquantum magnetoresistance in single-crystalline $\beta $-Ag$_2$Se by Zhang, Chenglong; Li, Haiwen; Chang, Tay-Rong; Xu, Su-Yang; Hua, Wei; Jiang, Hua; Yuan, Zhujun; Sun, Junliang; Jeng, Horng-Tay; Hasan, M. Zahid; Xie, X. C.; Jia, Shuang is a scholarly article available to read on EtoBox.

What is Ultraquantum magnetoresistance in single-crystalline $\beta $-Ag$_2$Se about?

In the history of condensed matter physics, reinvestigation of a well-studied material with enhanced quality sometimes led to important scientific discoveries. A well-known example is the discovery of fractional quantum Hall effect in high quality GaAs/AlGaAs heterojunctions. Here we report the first single crystal growth and magnetoresistance (MR) measurements of the silver chalcogenide $\beta $-Ag$_2$Se (Naumannite), a compound has been known for the unusual, linear-field-dependent MR in its polycrystalline form for over a decade. With the quantum limit (QL) as low as 3 Tesla, a moderate field produced by a superconductor magnet available in many laboratories can easily drive the electrons in Ag$_2$Se to an unprecedented state. We observed significant negative longitudinal MR beyond the QL, which was understood as a `charge-pumping' effect between the novel fermions with opposite chiralities. Characterization of the single-crystalline Ag$_2$Se and the fabrication of electric devices working above the QL, will represent a new direction for the study of these exotic electrons.

Author

Zhang, Chenglong; Li, Haiwen; Chang, Tay-Rong; Xu, Su-Yang; Hua, Wei; Jiang, Hua; Yuan, Zhujun; Sun, Junliang; Jeng, Horng-Tay; Hasan, M. Zahid; Xie, X. C.; Jia, Shuang

Published

2015

Language

EN