4.5 Article

Magnetic correlations in single-layer NbSe2

Journal

JOURNAL OF PHYSICS-CONDENSED MATTER
Volume 33, Issue 29, Pages -

Publisher

IOP PUBLISHING LTD
DOI: 10.1088/1361-648X/ac00da

Keywords

density functional theory; transition metal dichalcogenide; magnetism; charge density wave; scanning tunneling microscopy; spectroscopy

Funding

  1. Spanish Ministry of Science and Innovation [PID2019-107338RB-C66, FIS2015-64886-C5-5-P, MAT2017-83553-P]
  2. Spanish MINECO [MAT2017-88377-C2-1-R]
  3. ERC Starting Grant LINKSPM [758558]
  4. Scientific and Technological Research Council of Turkey (TUBTAK) [1059B141801387]
  5. European Research Council (ERC) [758558] Funding Source: European Research Council (ERC)

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Using spin-resolved density functional theory calculations, the study reveals that the most stable ground state of single-layer NbSe2 is ferrimagnetic, which prevents the development of charge density wave order. The calculated density of states accurately reproduces the experimental electronic and magnetic structure, highlighting the importance of magnetism in understanding the formation mechanisms of 2D superconductivity and CDW order.
By means of spin-resolved density functional theory calculations using both atomic orbitals and plane-wave basis codes, we study the electronic and magnetic ground state of single-layer NbSe2. We find that, for all the functionals considered, the most stable solution in this two-dimensional (2D) superconductor is the ferrimagnetic ground state with a magnetic moment of 1.09 mu(B) at the Nb atoms and of 0.05 mu(B) at the Se atoms pointing in the opposite direction. Our calculations show that the ferrimagnetic state precludes the development of charge density wave (CDW) order and their coexistence in the single-layer limit, unless graphene is considered as a substrate. The spin-resolved calculated density of states (DOS), a key fingerprint of the electronic and magnetic structure of a material, unambiguously reproduces the experimental DOS measured by scanning tunneling spectroscopy in single-layer NbSe2. Our work sets magnetism into play in this prototypical correlated 2D material, which is crucial to understand the formation mechanisms of 2D superconductivity and CDW order.

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