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Spin susceptibility in bilayered cuprates: resonant magnetic excitations
Ilya Eremin, Dirk K. Morr, Andrey V. Chubukov +1
We study the momentum and frequency dependence of the dynamical spin susceptibility in the superconducting state of bilayer cuprate superconductors. We show that there exists a res…
Phenomenological theory of the underdoped phase of a high-T superconductor
A. M. Tsvelik, A. V. Chubukov
We model the Fermi surface of the cuprates by one-dimensional nested parts near and and unnested parts near the zone diagonals. Fermions in the nested regions form…
Nonanalytic Magnetic Response of Fermi- and non-Fermi Liquids
Dmitrii L. Maslov, Andrey V. Chubukov, Ronojoy Saha
We study the nonanalytic behavior of the static spin susceptibility of 2D fermions as a function of temperature and magnetic field. For a generic Fermi liquid, χ_s (T, H)= const+c_…
Momentum-dependent light scattering in a 2D Heisenberg antiferromagnet
A. Donkov, A. V. Chubukov
Motivated by the achievements of the -ray scattering technique, we analyzed the profile of the light scattering intensity at a finite in a 2D Heisenberg antiferrom…
Flat spin wave dispersion in a triangular antiferromagnet
Oleg A. Starykh, Andrey V. Chubukov, Alexander G. Abanov
The excitation spectrum of a S=1/2 2D triangular quantum antiferromagnet is studied using 1/S expansion. Due to the non-collinearity of the classical ground state significant and n…
Quantum critical behavior in itinerant electron systems -- Eliashberg theory and instability of a ferromagnetic quantum-critical point
J. Rech, C. Pepin, A. V. Chubukov
We consider the problem of fermions interacting with gapless long-wavelength collective bosonic modes. The theory describes, among other cases, a ferromagnetic quantum-critical poi…