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Postmodern Fermi Liquids by Umang Mehta

Postmodern Fermi Liquids

by Umang Mehta
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Book cover type: Hardcover
  • ISBN13: 9783031724022
  • Binding: Hardcover
  • Subject: N/A
  • Publisher: Springer
  • Publisher Imprint: Springer
  • Publication Date:
  • Pages: 102
  • Original Price: EUR 139.99
  • Language: English
  • Edition: 2024
  • Item Weight: 332 grams
  • BISAC Subject(s): Physics / Quantum Theory, Mechanics / Thermodynamics, and Group Theory

From the Back Cover

This thesis develops a new approach to Fermi liquids based on the mathematical formalism of coadjoint orbits, allowing Landau's Fermi liquid theory to be recast in a simple and elegant way as a field theory. The theory of Fermi liquids is a cornerstone of condensed matter physics with many applications, but efforts to cast Landau's Fermi liquid theory in the modern language of effective field theory suffer from technical and conceptual difficulties: the Fermi surface seems to defy a simple effective field theory description. This thesis reviews the recently-developed formalism for Fermi liquids that exploits an underlying structure described by the group of canonical transformations of a single particle phase space. This infinite-dimensional group governs the space of states of zero temperature Fermi liquids and allows one to write down a nonlinear, bosonized action that reproduces Landau's kinetic theory in the classical limit. The thesis then describes how that Fermi liquid theory can essentially be thought of as a non-trivial representation of the Lie group of canonical transformations, bringing it within the fold of effective theories in many-body physics whose structure is determined by symmetries. After analyzing the benefits and limitations of this geometric formalism, pathways to extensions of the formalism to include superconducting and magnetic phases, as well as applications to the problem of non-Fermi liquids, are discussed. The thesis begins with a pedagogical review of Fermi liquid theory and concludes with a discussion on possible future directions for Fermi surface physics, and more broadly, the usefulness of diffeomorphism groups in condensed matter physics.

Umang Mehta obtained his B.Tech. degree at the Indian Institute of Technology Bombay in 2017, an M.S. degree at the University of Chicago in 2018, and a Ph.D. at the University of Chicago in 2023. He was awarded the DAAD WISE Scholarship awarded by the German Federal Ministry of Education and Research for undergraduate research in Germany, won the Gregor Wentzel Research Prize given by the Department of Physics of the University of Chicago for outstanding research in theoretical physics, and was a Graduate Fellow at the Kavli Institute for Theoretical Physics for the winter semester in 2022.

Umang is currently a postdoctoral researcher at the University of Colorado, Boulder and affiliated with the Simons Foundation's Ultra Quantum Matter collaboration. His research primarily focuses on the theory of many-body systems ranging from unconventional conductors and superconductors, topological phases of matter, to active dynamical systems.

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