High-
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 Berezinskii-Kosterlitz-Thouless transition in two-dimensional superconducting systems with coupled deep and quasiflat electronic bands with Van Hove singularities

Paramasivam, Sathish Kumar; Gangadharan, Shakhil Ponnarassery; Milošević, Milorad V.; Perali, Andrea

doi:10.1103/physrevb.110.024507

Phys. Rev. B

2024

DOI: 10.1103/physrevb.110.024507

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High- Tc Berezinskii-Kosterlitz-Thouless transition in two-dimensional superconducting systems with coupled deep and quasiflat electronic bands with Van Hove singularities

Sathish Kumar Paramasivam,

Shakhil Ponnarassery Gangadharan,

Milorad V. Milošević

et al.

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Cited by 4 publications

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Bypassing the lattice BCS–BEC crossover in strongly correlated superconductors through multiorbital physics

Witt,

Nomura,

Brener

et al. 2024

npj Quantum Mater.

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Superconductivity emerges from the spatial coherence of a macroscopic condensate of Cooper pairs. Increasingly strong binding and localization of electrons into these pairs compromises the condensate’s phase stiffness, thereby limiting critical temperatures – a phenomenon known as the BCS–BEC crossover in lattice systems. In this study, we demonstrate enhanced superconductivity in a multiorbital model of alkali-doped fullerides (A3C60) that goes beyond the limits of the lattice BCS–BEC crossover. We identify that the interplay of strong correlations and multiorbital effects results in a localized superconducting state characterized by a short coherence length but robust stiffness and a domeless rise in critical temperature with increasing pairing interaction. To derive these insights, we introduce a new theoretical framework allowing us to calculate the fundamental length scales of superconductors, namely the coherence length (ξ0) and the London penetration depth (λL), even in presence of strong electron correlations.

show abstract

Bypassing the lattice BCS–BEC crossover in strongly correlated superconductors through multiorbital physics

Witt,

Nomura,

Brener

et al. 2024

npj Quantum Mater.

View full text Add to dashboard Cite

show abstract

Amplitude, phase, and topological fluctuations shaping the complex phase diagram of two-dimensional superconductors

Furutani,

Midei,

Perali

et al. 2024

Phys. Rev. B

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Predictive power of the Berezinskii-Kosterlitz-Thouless theory based on renormalization group throughout the BCS-BEC crossover in two-dimensional superconductors

Midei,

Furutani,

Salasnich

et al. 2024

Phys. Rev. B

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High- Tc Berezinskii-Kosterlitz-Thouless transition in two-dimensional superconducting systems with coupled deep and quasiflat electronic bands with Van Hove singularities

Cited by 4 publications

References 63 publications

Bypassing the lattice BCS–BEC crossover in strongly correlated superconductors through multiorbital physics

Bypassing the lattice BCS–BEC crossover in strongly correlated superconductors through multiorbital physics

Amplitude, phase, and topological fluctuations shaping the complex phase diagram of two-dimensional superconductors

Predictive power of the Berezinskii-Kosterlitz-Thouless theory based on renormalization group throughout the BCS-BEC crossover in two-dimensional superconductors

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