Characterization of collective ground states in single-layer NbSe2

Ugeda, Miguel M.; Bradley, Aaron J.; Zhang, Yi; Onishi, Seita; Chen, Yi; Ruan, Wei; Ojeda-Aristizabal, Claudia; Ryu, Hyejin; Edmonds, Mark T.; Tsai, Hsin-Zon; Riss, Alexander; Mo, Sung-Kwan; Lee, Dunghai; Zettl, Alex; Hussain, Zahid; Shen, Zhi-Xun; Crommie, Michael F.

doi:10.1038/nphys3527

Title: Characterization of collective ground states in single-layer NbSe₂

Journal Article · Mon Nov 02 00:00:00 EST 2015 · Nature Physics

DOI:https://doi.org/10.1038/nphys3527· OSTI ID:1530224

Ugeda, Miguel M. ^[1]; Bradley, Aaron J. ^[2];

^[3]; Onishi, Seita ^[2]; Chen, Yi ^[2]; Ruan, Wei ^[4]; Ojeda-Aristizabal, Claudia ^[5]; Ryu, Hyejin ^[6]; Edmonds, Mark T. ^[7]; Tsai, Hsin-Zon ^[2]; Riss, Alexander ^[8];

^[6]; Lee, Dunghai ^[2]; Zettl, Alex ^[9]; Hussain, Zahid ^[6]; Shen, Zhi-Xun ^[10]; Crommie, Michael F. ^[9]

Univ. of California, Berkeley, CA (United States); CIC nanoGUNE, Donostia-San Sebastion (Spain); Basque Foundation for Science, Bilbao (Spain)
Univ. of California, Berkeley, CA (United States)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS); SLAC National Accelerator Lab., Menlo Park, CA (United States); Nanjing Univ. (China)
Univ. of California, Berkeley, CA (United States); Tsinghua Univ., Beijing (China)
Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); California State Univ. (CalState), Long Beach, CA (United States)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
Univ. of California, Berkeley, CA (United States); Monash Univ., Melbourne, VIC (Australia)
Univ. of California, Berkeley, CA (United States); Vienna Univ. of Technology (Austria). Inst. of Applied Physics
Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
SLAC National Accelerator Lab., Menlo Park, CA (United States); Stanford Univ., CA (United States)

Layered transition metal dichalcogenides are ideal systems for exploring the effects of dimensionality on correlated electronic phases such as charge density wave (CDW) order and superconductivity. In bulk NbSe₂ a CDW sets in at T CDW = 33 K and superconductivity sets in at T_c = 7.2 K. Below T_c these electronic states coexist but their microscopic formation mechanisms remain controversial. Here we present an electronic characterization study of a single two-dimensional (2D) layer of NbSe₂ by means of low-temperature scanning tunnelling microscopy/spectroscopy (STM/STS), angle-resolved photoemission spectroscopy (ARPES), and electrical transport measurements. We demonstrate that 3 × 3 CDW order in NbSe₂ remains intact in two dimensions. Superconductivity also still remains in the 2D limit, but its onset temperature is depressed to 1.9 K. Our STS measurements at 5 K reveal a CDW gap of Δ = 4 meV at the Fermi energy, which is accessible by means of STS owing to the removal of bands crossing the Fermi level for a single layer. Our observations are consistent with the simplified (compared to bulk) electronic structure of single-layer NbSe₂, thus providing insight into CDW formation and superconductivity in this model strongly correlated system.

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Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 1530224

Journal Information:: Nature Physics, Vol. 12, Issue 1; ISSN 1745-2473

Publisher:: Nature Publishing Group (NPG)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 430 works

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Morphology Control of Epitaxial Monolayer Transition Metal Dichalcogenides Rajan, Akhil; Underwood, Kaycee; Mazzola, Federico arXiv https://doi.org/10.48550/arxiv.1910.03307	text	January 2019
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