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Ultraviolet-Infrared Mixing in Marginal Fermi Liquids.
Ye, Weicheng; Lee, Sung-Sik; Zou, Liujun.
Afiliación
  • Ye W; Perimeter Institute for Theoretical Physics, Waterloo, Ontario N2L 2Y5, Canada.
  • Lee SS; Department of Physics and Astronomy, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada.
  • Zou L; Perimeter Institute for Theoretical Physics, Waterloo, Ontario N2L 2Y5, Canada.
Phys Rev Lett ; 128(10): 106402, 2022 Mar 11.
Article en En | MEDLINE | ID: mdl-35333078
When Fermi surfaces (FSs) are subject to long-range interactions that are marginal in the renormalization-group sense, Landau Fermi liquids are destroyed, but only barely. With the interaction further screened by particle-hole excitations through one-loop quantum corrections, it has been believed that these marginal Fermi liquids (MFLs) are described by weakly coupled field theories at low energies. In this Letter, we point out a possibility in which higher-loop processes qualitatively change the picture through UV-IR mixing, in which the size of the FS enters as a relevant scale. The UV-IR mixing effect enhances the coupling at low energies, such that the basin of attraction for the weakly coupled fixed point of a (2+1)-dimensional MFL shrinks to a measure-zero set in the low-energy limit. This UV-IR mixing is caused by gapless virtual Cooper pairs that spread over the entire FS through marginal long-range interactions. Our finding signals a possible breakdown of the patch description for the MFL and questions the validity of using the MFL as the base theory in a controlled scheme for non-Fermi liquids that arise from relevant long-range interactions.

Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Phys Rev Lett Año: 2022 Tipo del documento: Article País de afiliación: Canadá Pais de publicación: Estados Unidos

Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Phys Rev Lett Año: 2022 Tipo del documento: Article País de afiliación: Canadá Pais de publicación: Estados Unidos