Observation of spin-polarized bands and domain-dependent Fermi arcs in polar Weyl semimetal MoTe2

被引：29

作者：

Sakano, M. ^{[1
,2
,3
]}

Bahramy, M. S. ^{[1
,2
,4
]}

Tsuji, H. ^{[1
,2
]}

Araya, I. ^{[2
]}

Ikeura, K. ^{[1
,2
]}

Sakai, H. ^{[1
,2
,5
]}

Ishiwata, S. ^{[1
,2
,6
]}

Yaji, K. ^{[3
]}

Kuroda, K. ^{[3
]}

Harasawa, A. ^{[3
]}

Shin, S. ^{[3
]}

Ishizaka, K. ^{[1
,2
,4
]}

机构：

[1] Univ Tokyo, QPEC, Tokyo 1138656, Japan

[2] Univ Tokyo, Dept Appl Phys, Tokyo 1138656, Japan

[3] Univ Tokyo, Inst Solid State Phys, Kashiwa, Chiba 2778581, Japan

[4] RIKEN, Ctr Emergent Matter Sci, Wako, Saitama 3510198, Japan

[5] Osaka Univ, Dept Phys, Toyonaka, Osaka 5600043, Japan

[6] Japan Sci & Technol Agcy JST, PRESTO, Tokyo 1028666, Japan

来源：

PHYSICAL REVIEW B | 2017年 / 95卷 / 12期

关键词：

PHASE-TRANSITION; TAAS;

D O I：

10.1103/PhysRevB.95.121101

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We investigate the surface electronic structures of polar 1T'-MoTe2, the Weyl semimetal candidate realized through the nonpolar-polar structural phase transition, by utilizing the laser angle-resolved photoemission spectroscopy combined with first-principles calculations. Two kinds of domains with different surface band dispersions are observed from a single-crystalline sample. The spin-resolved measurements further reveal that the spin polarizations of the surface and the bulk-derived states show the different domain dependences, indicating the opposite bulk polarity. For both domains, some segmentlike band features resembling the Fermi arcs are clearly observed. The patterns of the arcs present the marked contrast between the two domains, respectively agreeing well with the slab calculation of (0 0 1) and (0 0-1) surfaces. The present result strongly suggests that the Fermi arc connects the identical pair of Weyl nodes on one side of the polar crystal surface, whereas it connects between the different pairs of Weyl nodes on the other side.

引用

页数：6