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Abstract
Transition metal dichalcogenides (TMDC) are a rich family of two-dimensional materials displaying a multitude of different quantum ground states. In particular, d3 TMDCs are paradigmatic materials hosting a variety of symmetry broken states, including charge density waves, superconductivity, and magnetism. Among this family, NbSe2 is one of the best-studied superconducting materials down to the monolayer limit. Despite its superconducting nature, a variety of results point toward strong electronic repulsions in NbSe2. Here, we control the strength of the interactions experimentally via quantum confinement and use low-temperature scanning tunneling microscopy (STM) and spectroscopy (STS) to demonstrate that NbSe2 is in close proximity to a correlated insulating state. This reveals the coexistence of competing interactions in NbSe2, creating a transition from a superconducting to an insulating quantum correlated state by confinement-controlled interactions. Our results demonstrate the dramatic role of interactions in NbSe2, establishing NbSe2 as a correlated superconductor with competing interactions.
Original language | English |
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Pages (from-to) | 1845-1850 |
Number of pages | 6 |
Journal | Nano Letters |
Volume | 22 |
Issue number | 5 |
Early online date | 15 Feb 2022 |
DOIs | |
Publication status | Published - 9 Mar 2022 |
MoE publication type | A1 Journal article-refereed |
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LadoJoseATkulut: Lado Jose AT-kulut
Lado, J., Hyart, T., Kumar, P. & Koch, R.
01/09/2020 → 31/08/2023
Project: Academy of Finland: Other research funding
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LadoJoseATpalkka: Lado Jose AT-palkka
01/09/2020 → 31/08/2025
Project: Academy of Finland: Other research funding
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ADaM: Artificial designer materials
Liljeroth, P., Aapro, M., Amini, M., Gonzalez Herrero, H., Khosravian, M., Drost, R., Karjasilta, A., Kipnis, A., Otero Fumega, A. & Arslan, B.
01/01/2019 → 31/12/2023
Project: Academy of Finland: Other research funding