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Kohn-Luttinger correction to T_c in a phonon superconductor

机译:声子超导体中对T_c的Kohn-Luttinger校正

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摘要

Weak coupling theory predicts the critical temperature of a phonon superconductor to be T_c= 1.13e~(3/2) ω_(D~e~(1/λ)), where ω_D is the Debye frequency, X is the dimensionless electron-phonon coupling constant, and the factor e~(-3/2) comes from fermionic self-energy and frequency dependence of the interaction. Other corrections are small either in ω~D/E_F, by Migdal's theorem, or in λ. However, this formula assumes that w_D ≪ E_F, where E_F is the Fermi energy. We obtain T_c in the dilute regime, when the Fermi energy is smaller than cup. We argue that in this situation Migdal's theorem is no longer valid, and Kohn-Luttinger-type corrections to the pairing interaction must be included to obtain the correct prefactor for Tc.
机译:弱耦合理论预测声子超导体的临界温度为T_c = 1.13e〜(3/2)ω_(D〜e〜(1 /λ)),其中ω_D为德拜频率,X为无量纲电子声子耦合常数,因子e〜(-3/2)来自铁离子自能和相互作用的频率依赖性。根据Migdal定理,其他修正在ω〜D / E_F中很小,或者在λ中很小。但是,该公式假定w_D≪ E_F,其中E_F是费米能量。当费米能量小于杯子时,我们在稀薄状态下获得T_c。我们认为,在这种情况下,Migdal定理不再有效,并且必须包括对配对相互作用的Kohn-Luttinger型校正,以获得Tc的正确前置因子。

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  • 来源
    《Physical review》 |2020年第2期|024503.1-024503.14|共14页
  • 作者

    Dan Phan; Andrey V. Chubukov;

  • 作者单位

    School of Physics and Astronomy University of Minnesota Minneapolis Minnesota 55455 USA;

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  • 正文语种 eng
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