Discommensuration-enhanced superconductivity in the charge density wave phases of transition-metal dichalcogenides

Abstract

We introduce a McMillan-Ginzburg-Landau theory to describe the cooperative coexistence of charge-density and superconducting order in two-dimensional crystals. With a free-energy that explicitly accounts for the competition between commensurate and incommensurate ground states, we are able to map the transition between these phases and monitor the development of discommensurations in the near-commensurate regime. Attributing the enhancement of superconducting order to density-wave fluctuations, we propose a coupling scheme that yields a phase diagram in qualitative agreement with experiments in conducting transition metal dichalcogenides. The model predicts the development of non-uniform superconductivity similar to that arising from a pair-density wave, with a spatial texture driven by the underlying charge-density wave fluctuations.

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Cited by in corpus (17)

• Discovery of a Cooper-Pair Density Wave State in a Transition-Metal Dichalcogenide
• Enhanced charge density wave coherence in a light-quenched, high-temperature superconductor
• Emergent Honeycomb Network of Topological Excitations in Correlated Charge Density Wave
• Locally commensurate charge-density wave with three-unit-cell periodicity in YBCO
• Zoology of domain walls in quasi-2D correlated charge density wave of 1T-TaS2
• Multiple charge density waves and superconductivity nucleation at antiphase domain walls in the nematic pnictide Ba${}_{1-x}$Sr${}_x$Ni${}_2$As${}_2$
• Stable Flatbands, Topology, and Superconductivity of Magic Honeycomb Networks
• Anomalous quantum metal in a 2D crystalline superconductor with intrinsic electronic non-uniformity
• Phase Separation in the Vicinity of Fermi Surface Hot Spots
• Non-Fermi Liquids in Conducting 2D Networks
• Electron correlations rule the phonon-driven instability in single layer TiSe${}_2$
• Protected superconductivity at the boundaries of charge-density-wave domains
• Intertwined Orders and the Physics of High Temperature Superconductors
• Moiré Superstructures in Marginally-Twisted NbSe${}_2$ Bilayers
• Unconventional orbital-charge density wave mechanism in transition metal dichalcogenide 1T-TaS2
• Doping-induced nematic and stripe orders within the charge density wave state of TiSe${}_2$
• Metal-to-insulator transition in Pt-doped TiSe${}_2$ driven by emergent network of narrow transport channels