Charge density wave transition in single-layer titanium diselenide

P Chen, Y. -H. Chan, X. -Y. Fang, Y Zhang, M Y Chou (), S. -K. Mo, Z Hussain, A. -V. Fedorov and T. -C. Chiang ()
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P Chen: University of Illinois at Urbana-Champaign
Y. -H. Chan: Institute of Atomic and Molecular Sciences
X. -Y. Fang: University of Illinois at Urbana-Champaign
Y Zhang: Advanced Light Source, Lawrence Berkeley National Laboratory
M Y Chou: Institute of Atomic and Molecular Sciences
S. -K. Mo: Advanced Light Source, Lawrence Berkeley National Laboratory
Z Hussain: Advanced Light Source, Lawrence Berkeley National Laboratory
A. -V. Fedorov: Advanced Light Source, Lawrence Berkeley National Laboratory
T. -C. Chiang: University of Illinois at Urbana-Champaign

Nature Communications, 2015, vol. 6, issue 1, 1-5

Abstract: Abstract A single molecular layer of titanium diselenide (TiSe2) is a promising material for advanced electronics beyond graphene—a strong focus of current research. Such molecular layers are at the quantum limit of device miniaturization and can show enhanced electronic effects not realizable in thick films. We show that single-layer TiSe2 exhibits a charge density wave (CDW) transition at critical temperature TC=232±5 K, which is higher than the bulk TC=200±5 K. Angle-resolved photoemission spectroscopy measurements reveal a small absolute bandgap at room temperature, which grows wider with decreasing temperature T below TC in conjunction with the emergence of (2 × 2) ordering. The results are rationalized in terms of first-principles calculations, symmetry breaking and phonon entropy effects. The observed Bardeen-Cooper-Schrieffer (BCS) behaviour of the gap implies a mean-field CDW order in the single layer and an anisotropic CDW order in the bulk.

Date: 2015
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DOI: 10.1038/ncomms9943

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