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Unconventional Superconductivity in Bilayer Transition Metal Dichalcogenides
1Department of Physics, The Pennsylvania State University, University Park, Pennsylvania 16802-6300, USA.
Physical Review Letters
|March 11, 2017
Summary
Bilayer transition metal dichalcogenides (TMDs) exhibit unique coupled spin-valley-layer properties. Their structure enables a rich phase diagram for unconventional superconductivity, including novel pairing states and magnetic field-induced phenomena.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Quantum Materials
Background:
- Bilayer transition metal dichalcogenides (TMDs) possess coupled spin-valley-layer degrees of freedom.
- These materials have a crystal structure that is globally centrosymmetric yet locally noncentrosymmetric.
Purpose of the Study:
- To investigate the unconventional superconductivity in bilayer TMDs.
- To explore the rich phase diagram arising from the unique properties of these materials.
Main Methods:
- Theoretical analysis of bilayer TMDs.
- Investigation of superconducting pairing states (intralayer singlet, interlayer singlet, interlayer triplet).
Main Results:
- Predicted a rich phase diagram for unconventional superconductivity in bilayer TMDs.
- Identified intralayer and interlayer singlet and triplet pairing possibilities.
- Predicted the existence of the inhomogeneous Fulde-Ferrell-Larkin-Ovchinnikov state under in-plane magnetic fields.
Conclusions:
- The combination of coupled spin-valley-layer degrees of freedom and local noncentrosymmetry in bilayer TMDs leads to diverse superconducting states.
- Bilayer TMDs offer a promising platform for exploring exotic superconductivity, including field-induced phenomena.
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