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Characterization of collective ground states in single-layer NbSe2
Open accessAbstract
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 TCDW = 33 K and superconductivity sets in at Tc = 7.2 K. Below Tc 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. What happens to correlated electronic phases—superconductivity and charge density wave ordering—as a material is thinned? Experiments show that both can remain intact in just a single layer of niobium diselenide.
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Cites
Two-dimensional atomic crystals
Novoselov, K. S., Jiang, D., Schedin, F., Booth, T. J., Khotkevich, V. V., Morozov, S. V., & Geim, A. K. (2005) · Proceedings of the National Academy of Sciences · doi:10.1073/pnas.0502848102 · Cited by 11,788
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Tang, S., Zhang, C., Wong, D., Pedramrazi, Z., Tsai, H.-Z., Jia, C., Moritz, B., Claassen, M., Ryu, H., Kahn, S., et al. (2017) · Nature Physics · doi:10.1038/nphys4174 · Cited by 846
Self-citationHigh-quality monolayer superconductor NbSe2 grown by chemical vapour deposition
Wang, H., Huang, X., Lin, J., Cui, J., Chen, Y., Zhu, C., Liu, F., Zeng, Q., Zhou, J., Yu, P., et al. (2017) · Nature Communications · doi:10.1038/s41467-017-00427-5 · Cited by 425
Self-citationTopological superconductivity in a van der Waals heterostructure
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Synthesis, structure and applications of graphene-based 2D heterostructures
Solís-Fernández, P., Bissett, M., & Ago, H. (2017) · Chemical Society Reviews · doi:10.1039/c7cs00160f · Cited by 371
Metadata
- Authors
- Ugeda, M. M., Bradley, A. J., Zhang, Y., Onishi, S., Chen, Y., Ruan, W., Ojeda-Aristizabal, C., Ryu, H., Edmonds, M. T., Tsai, H.-Z., Riss, A., Mo, S.-K., Lee, D., Zettl, A., Hussain, Z., Shen, Z.-X., & Crommie, M. F.
- Venue
- Nature Physics
- Published
- 2015-11-02
- Volume
- 12
- Issue
- 1
- Pages
- 92-97
- ISSN
- 1745-2473 (ISSN-L)
- 1745-2481
- OpenAlex
- W2157432896
- Cited by
- 742
- References
- 1
- FWCI
- 19.45
- Type
- journal article
- Language
- en
- Open access
- green
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