Pertubation theory around nonnested fermi surfaces. I. Keeping the fermi surface fixed
نویسندگان
چکیده
منابع مشابه
Perturbation Theory around Non–Nested Fermi Surfaces II. Regularity of the Moving Fermi Surface: RPA Contributions
Regularity of the deformation of the Fermi surface under short-range interactions is established for all contributions to the RPA self–energy (it is proven in an accompanying paper that the RPA graphs are the least regular contributions to the self–energy). Roughly speaking, the graphs contributing to the RPA self– energy are those constructed by contracting two external legs of a four–legged g...
متن کاملEffective Field Theory and the Fermi Surface
This is an introduction to the method of effective field theory. As an application, I derive the effective field theory of low energy excita-tions in a conductor, the Landau theory of Fermi liquids, and explain why the high-T c superconductors must be described by a different effective field theory. Lectures presented at TASI 1992.
متن کاملStability of Fermi surfaces and K theory.
Nonrelativistic Fermi liquids in d+1 dimensions exhibit generalized Fermi surfaces: (d-p)-dimensional submanifolds in the (k,omega)-space supporting gapless excitations. We show that the universality classes of stable Fermi surfaces are classified by K theory, with the pattern of stability determined by Bott periodicity. The Atiyah-Bott-Shapiro construction implies that the low-energy modes nea...
متن کاملAn inversion theorem in Fermi surface theory
We prove a perturbative inversion theorem for the map between the interacting and the noninteracting Fermi surface for a class of many fermion systems with strictly convex Fermi surfaces and short-range interactions between the fermions. This theorem gives a physical meaning to the counterterm function K that we use in the renormalization of these models: K can be identified as that part of the...
متن کاملThe Lattice Fermi Surface
The Nambu – Jona-Lasinio model in 2+1 dimensions is simulated for non-zero baryon chemical potential with a diquark source term. No evidence for a BCS condensate or gap is seen at high density; rather, critical behaviour with novel exponents is observed, suggesting that 2d superfluidity as first described by Kosterlitz and Thouless is realised, but with the universality class determined by the ...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Journal of Statistical Physics
سال: 1996
ISSN: 0022-4715,1572-9613
DOI: 10.1007/bf02174132