Bulletin of the American Physical Society
APS March Meeting 2019
Volume 64, Number 2
Monday–Friday, March 4–8, 2019; Boston, Massachusetts
Session A14: 2D Materials (Metals, Superconductors, and Correlated Materials) -- CDWs
8:00 AM–10:36 AM,
Monday, March 4, 2019
BCEC
Room: 153C
Sponsoring
Units:
DMP DCOMP
Chair: Daniel Rhodes, Columbia Univ
Abstract: A14.00004 : Unique gap structure and symmetry of the charge density wave in single-layer VSe2
8:36 AM–8:48 AM
Presenter:
Peng Chen
(Physics, University of Illinois Urbana-Champaign)
Authors:
Peng Chen
(Physics, University of Illinois Urbana-Champaign)
Woei Wu Pai
(National Taiwan University)
Yang-hao Chan
(Academia Sinica)
Vidya Madhavan
(Physics, University of Illinois Urbana-Champaign)
Mei-Yin Chou
(National Taiwan University)
Sung-Kwan Mo
(Lawrence Berkeley National Laboratory)
Alexei V Fedorov
(Lawrence Berkeley National Laboratory)
Tai-Chang Chiang
(Physics, University of Illinois Urbana-Champaign)
Single layers of transition metal dichalcogenides (TMDCs) are excellent candidates for electronic applications beyond the graphene platform; many of them exhibit novel properties including charge density waves (CDWs) and magnetic ordering. CDWs in these single layers are generally a planar projection of the corresponding bulk CDWs because of the quasi-two-dimensional nature of TMDCs; a different CDW symmetry is unexpected. We report herein the successful creation of pristine single-layer VSe2, which shows a (sqrt(7) x sqrt(3)) CDW in contrast to the (4 x 4) CDW for the layers in bulk VSe2. Angle-resolved photoemission spectroscopy (ARPES) from the single layer shows a sizable (sqrt(7) x sqrt(3)) CDW gap of ~100 meV at the zone boundary, a 220 K CDW transition temperature twice the bulk value, and no ferromagnetic exchange splitting as predicated by theory. This robust CDW with an exotic broken symmetry as the ground state is explained via a first-principles analysis. The results illustrate a unique CDW phenomenon in the two-dimensional limit.
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