Confinement-Engineered Superconductor to Correlated-Insulator Transition in a van der Waals Monolayer. Ganguli, S. C., Vaňo, V., Kezilebieke, S., Lado, J. L., & Liljeroth, P. Nano Letters, 22(5):1845–1850, American Chemical Society, March, 2022. ![Confinement-Engineered Superconductor to Correlated-Insulator Transition in a van der Waals Monolayer [link]](https://bibbase.org/img/filetypes/link.svg "link")
Paper doi abstract bibtex 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.
@article{ganguli_confinement-engineered_2022,
title = {Confinement-{Engineered} {Superconductor} to {Correlated}-{Insulator} {Transition} in a van der {Waals} {Monolayer}},
volume = {22},
issn = {1530-6984},
url = {https://doi.org/10.1021/acs.nanolett.1c03491},
doi = {10.1021/acs.nanolett.1c03491},
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.},
number = {5},
urldate = {2022-05-12},
journal = {Nano Letters},
publisher = {American Chemical Society},
author = {Ganguli, Somesh Chandra and Vaňo, Viliam and Kezilebieke, Shawulienu and Lado, Jose L. and Liljeroth, Peter},
month = mar,
year = {2022},
pages = {1845--1850},
}
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