Screening corrections on the critical temperature and gap parameter throughout the BCS-BEC crossover

P. Pieri, Giancarlo Strinati Calvanese, L. Pisani

Published Jan 1, 2018• 0 citations

OpenAlex

Related papers

Effects of the GMB correction on the critical temperature and gap parameter throughout the BCS-BEC crossover

P. Pieri, Giancarlo Strinati Calvanese, Andrea Perali +1 more

Jan 1, 20180 citations

BCS-BEC Crossover: Critical Temperature Curve and Thermodynamics

Evgeny Kozik, Barbara Capogrosso-Sansone, Nikolay V. Prokof'ev +1 more

Bulletin of the American Physical SocietyJun 7, 20070 citations

Modified Fermi sphere, pairing gap, and critical temperature for the BCS-BEC crossover

Stefan Floerchinger, Michael M. Scherer, CHRISTOF WETTERICH

arXiv:0912.4050Physical Review AJun 14, 201038 citations

TACKLING FLUCTUATION CORRECTIONS IN THE BEC/BCS CROSSOVER AT NONZERO TEMPERATURES

Jacques Tempere, Serghei N. Klimin, J. T. Devreese

International Conference on Path IntegralsNov 1, 20080 citations

Strong-Coupling Effects on Specific Heat in the BCS–BEC Crossover

Daisuke Inotani, Pieter van Wyk, Yoji Ohashi

arXiv:1904.09920Journal of Low Temperature PhysicsMay 7, 20190 citations

Screening of pair fluctuations in superconductors with coupled shallow and deep bands: A route to higher-temperature superconductivity

Luca Salasnich, Arkady A Shanenko, Alexei Vagov +2 more

arXiv:1810.03321Physical review. B./Physical review. BAug 12, 201952 citations

Screening corrections on the critical temperature and gap parameter throughout the BCS-BEC crossover

P. Pieri, Giancarlo Strinati Calvanese, L. Pisani

Published Jan 1, 2018• 0 citations

OpenAlex

Related papers

Effects of the GMB correction on the critical temperature and gap parameter throughout the BCS-BEC crossover

P. Pieri, Giancarlo Strinati Calvanese, Andrea Perali +1 more

Jan 1, 20180 citations

BCS-BEC Crossover: Critical Temperature Curve and Thermodynamics

Evgeny Kozik, Barbara Capogrosso-Sansone, Nikolay V. Prokof'ev +1 more

Bulletin of the American Physical SocietyJun 7, 20070 citations

Modified Fermi sphere, pairing gap, and critical temperature for the BCS-BEC crossover

Stefan Floerchinger, Michael M. Scherer, CHRISTOF WETTERICH

We investigate the phase diagram of two-component fermions in the BCS-BEC (Bose-Einstein condensate) crossover. Using functional renormalization-group equations we calculate the effect of quantum fluctuations on the fermionic self-energy parametrized by a wave-function renormalization, an effective Fermi radius, and the gap. This allows us to follow the modifications of the Fermi surface and the dispersion relation for fermionic excitations throughout the whole crossover region. We also determine the critical temperature of the second-order phase transition to superfluidity. Our results are in agreement with BCS theory including Gorkov's correction for a small negative scattering length $a$ and with an interacting Bose gas for a small positive $a$ . At the unitarity point the result for the gap at zero temperature agrees well with quantum Monte Carlo simulations, while the critical temperature differs.We investigate the phase diagram of two-component fermions in the BCS-BEC (Bose-Einstein condensate) crossover. Using functional renormalization-group equations we calculate the effect of quantum fluctuations on the fermionic self-energy parametrized by a wave-function renormalization, an effective Fermi radius, and the gap. This allows us to follow the modifications of the Fermi surface and the dispersion relation for fermionic excitations throughout the whole crossover region. We also determine the critical temperature of the second-order phase transition to superfluidity. Our results are in agreement with BCS theory including Gorkov's correction for a small negative scattering length $a$ and with an interacting Bose gas for a small positive $a$. At the unitarity point the result for the gap at zero temperature agrees well with quantum Monte Carlo simulations, while the critical temperature differs.

arXiv:0912.4050Physical Review AJun 14, 201038 citations

TACKLING FLUCTUATION CORRECTIONS IN THE BEC/BCS CROSSOVER AT NONZERO TEMPERATURES

Jacques Tempere, Serghei N. Klimin, J. T. Devreese

International Conference on Path IntegralsNov 1, 20080 citations

Strong-Coupling Effects on Specific Heat in the BCS–BEC Crossover

Daisuke Inotani, Pieter van Wyk, Yoji Ohashi

arXiv:1904.09920Journal of Low Temperature PhysicsMay 7, 20190 citations

Screening of pair fluctuations in superconductors with coupled shallow and deep bands: A route to higher-temperature superconductivity

Luca Salasnich, Arkady A Shanenko, Alexei Vagov +2 more

A combination of strong Cooper pairing and weak superconducting fluctuations is crucial to achieve and stabilize high- ${T}_{c}$ superconductivity. We demonstrate that a coexistence of a shallow carrier band with strong pairing and a deep band with weak pairing, together with the Josephson-like pair transfer between the bands to couple the two condensates, realizes an optimal multicomponent superconductivity regime: it preserves strong pairing to generate large gaps and a very high critical temperature but screens the detrimental superconducting fluctuations, thereby suppressing the pseudogap state. Surprisingly, we find that the screening is very efficient even when the interband coupling is very small. Thus, a multiband superconductor with a coherent mixture of condensates in the BCS regime (deep band) and in the BCS-BEC crossover regime (shallow band) offers a promising route to higher critical temperatures.A combination of strong Cooper pairing and weak superconducting fluctuations is crucial to achieve and stabilize high-${T}_{c}$ superconductivity. We demonstrate that a coexistence of a shallow carrier band with strong pairing and a deep band with weak pairing, together with the Josephson-like pair transfer between the bands to couple the two condensates, realizes an optimal multicomponent superconductivity regime: it preserves strong pairing to generate large gaps and a very high critical temperature but screens the detrimental superconducting fluctuations, thereby suppressing the pseudogap state. Surprisingly, we find that the screening is very efficient even when the interband coupling is very small. Thus, a multiband superconductor with a coherent mixture of condensates in the BCS regime (deep band) and in the BCS-BEC crossover regime (shallow band) offers a promising route to higher critical temperatures.

arXiv:1810.03321Physical review. B./Physical review. BAug 12, 201952 citations

a

and with an interacting Bose gas for a small positive

a

. At the unitarity point the result for the gap at zero temperature agrees well with quantum Monte Carlo simulations, while the critical temperature differs.

A combination of strong Cooper pairing and weak superconducting fluctuations is crucial to achieve and stabilize high-

{T}_{c}

superconductivity. We demonstrate that a coexistence of a shallow carrier band with strong pairing and a deep band with weak pairing, together with the Josephson-like pair transfer between the bands to couple the two condensates, realizes an optimal multicomponent superconductivity regime: it preserves strong pairing to generate large gaps and a very high critical temperature but screens the detrimental superconducting fluctuations, thereby suppressing the pseudogap state. Surprisingly, we find that the screening is very efficient even when the interband coupling is very small. Thus, a multiband superconductor with a coherent mixture of condensates in the BCS regime (deep band) and in the BCS-BEC crossover regime (shallow band) offers a promising route to higher critical temperatures.