Hoerhold, Sebastian and Graf, Juliane and Marganska, Magdalena and Grifoni, Milena (2023) Two-bands Ising superconductivity from Coulomb interactions in monolayer NbSe₂. 2D MATERIALS, 10 (2): 025008. ISSN 2053-1583
Full text not available from this repository. (Request a copy)Abstract
The nature of superconductivity in monolayer transition metal dichalcogenides is still under debate. It has already been argued that repulsive Coulomb interactions, combined with the disjoint Fermi surfaces around the K, K ' valleys and at the gamma point, can lead to superconducting instabilities in monolayer NbSe2. Here, we demonstrate the two-bands nature of superconductivity in NbSe2. It arises from the competition of repulsive long range intravalley and short range intervalley interactions together with Ising spin-orbit coupling. The two distinct superconducting gaps, one for each spin-orbit split band, consist of a mixture of s-wave and f-wave components. Their different amplitudes are due to the difference between the normal densities of states of the two bands at the Fermi level. Using a microscopic multiband BCS approach, we derive and self-consistently solve the gap equation, demonstrating the stability of nontrivial solutions in a realistic parameter range. We find a universal behavior of the temperature dependence of the gaps and of the critical in-plane field which is consistent with various sets of existing experimental data.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | unconventional superconductivity; TMDC; microscopic multiband BCS; Coulomb interaction |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Theroretical Physics > Chair Professor Grifoni > Group Milena Grifoni |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 27 Feb 2024 09:55 |
| Last Modified: | 27 Feb 2024 09:55 |
| URI: | https://pred.uni-regensburg.de/id/eprint/59090 |
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