Strong correlations and orbital texture in single-layer 1T-TaSe2

Chen, Yi; Ruan, Wei; Wu, Meng; Tang, Shujie; Ryu, Hyejin; Tsai, Hsin-Zon; Lee, Ryan; Kahn, Salman; Liou, Franklin; Jia, Caihong; Albertini, Oliver R; Xiong, Hongyu; Jia, Tao; Liu, Zhi; Sobota, Jonathan A; Liu, Amy Y; Moore, Joel E; Shen, Zhi-Xun; Louie, Steven G; Mo, Sung-Kwan; Crommie, Michael F

doi:10.1038/s41567-019-0744-9

Title: Strong correlations and orbital texture in single-layer 1T-TaSe2

Journal Article · 01 February 2020 · NATURE PHYSICS

DOI: https://doi.org/10.1038/s41567-019-0744-9 · OSTI ID:1604730

Chen, Yi; Ruan, Wei; Wu, Meng; Tang, Shujie; Ryu, Hyejin; Tsai, Hsin-Zon; Lee, Ryan; Kahn, Salman; Liou, Franklin; Jia, Caihong; Albertini, Oliver R; Xiong, Hongyu; Jia, Tao; Liu, Zhi; Sobota, Jonathan A; Liu, Amy Y; Moore, Joel E; Shen, Zhi-Xun; Louie, Steven G; Mo, Sung-Kwan more »

© 2020, The Author(s), under exclusive licence to Springer Nature Limited. Strong electron correlation can induce Mott insulating behaviour and produce intriguing states of matter such as unconventional superconductivity and quantum spin liquids. Recent advances in van der Waals material synthesis enable the exploration of Mott systems in the two-dimensional limit. Here we report characterization of the local electronic properties of single- and few-layer 1T-TaSe2 via spatial- and momentum-resolved spectroscopy involving scanning tunnelling microscopy and angle-resolved photoemission. Our results indicate that electron correlation induces a robust Mott insulator state in single-layer 1T-TaSe2 that is accompanied by unusual orbital texture. Interlayer coupling weakens the insulating phase, as shown by reduction of the energy gap and quenching of the correlation-driven orbital texture in bilayer and trilayer 1T-TaSe2. This establishes single-layer 1T-TaSe2 as a useful platform for investigating strong correlation physics in two dimensions.

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Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)

Sponsoring Organization:: Max Planc Korea; National Natural Science Foundation of China (NNSFC); National Research Foundation (NRF), Korea; National Science Foundation (NSF); Shenzhen Peacock Plan; USDOE Office of Science (SC); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division

Grant/Contract Number:: AC02-05CH11231; AC02-76SF00515

OSTI ID:: 1604730

Journal Information:: NATURE PHYSICS, Journal Name: NATURE PHYSICS Journal Issue: 2 Vol. 16

Country of Publication:: United States

Language:: English

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