Ultrahigh mobility and giant magnetoresistance in the Dirac semimetal Cd3As2

被引：1271

作者：

Liang, Tian ^{[1
]}

Gibson, Quinn ^{[2
]}

Ali, Mazhar N. ^{[2
]}

Liu, Minhao ^{[1
]}

Cava, R. J. ^{[2
]}

Ong, N. P. ^{[1
]}

机构：

[1] Princeton Univ, Dept Phys, Princeton, NJ 08544 USA

[2] Princeton Univ, Dept Chem, Princeton, NJ 08544 USA

来源：

NATURE MATERIALS | 2015年 / 14卷 / 03期

基金：

美国国家科学基金会;

关键词：

QUANTUM; SCATTERING; SURFACE;

D O I：

10.1038/nmat4143

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Dirac and Weyl semimetals are 3D analogues of graphene in which crystalline symmetry protects the nodes against gap formation(1-3). Na3Bi and Cd3As2 were predicted to be Dirac semimetals(4,5), and recently confirmed to be so by photoemission experiments(6-8). Several novel transport properties in a magnetic field have been proposed for Dirac semimetals(2,9-11). Here, we report a property of Cd3As2 that was unpredicted, namely a remarkable protection mechanism that strongly suppresses backscattering in zero magnetic field. In single crystals, the protection results in ultrahigh mobility, 9 x 10(6) cm(2) V-1 s(-1) at 5 K. Suppression of backscattering results in a transport lifetime 10(4) times longer than the quantum lifetime. The lifting of this protection by the applied magnetic field leads to a very large magnetoresistance. We discuss how this may relate to changes to the Fermi surface induced by the applied magnetic field.

引用

页码：280 / 284

页数：5

共 31 条

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