Large- theory of critical Fermi surfaces. II. Conductivity
A Fermi surface coupled to a scalar field can be described in a 1/N expansion by choosing
the fermion-scalar Yukawa coupling to be random in the N-dimensional flavor space, but …
the fermion-scalar Yukawa coupling to be random in the N-dimensional flavor space, but …
Large- theory of critical Fermi surfaces
We describe the large-N saddle point, and the structure of fluctuations about the saddle
point, of a theory containing a sharp, critical Fermi surface in two spatial dimensions. The …
point, of a theory containing a sharp, critical Fermi surface in two spatial dimensions. The …
Superconductivity near a quantum-critical point: The special role of the first matsubara frequency
Near a quantum-critical point in a metal strong fermion-fermion interaction mediated by a
soft collective boson gives rise to incoherent, non-Fermi liquid behavior. It also often gives …
soft collective boson gives rise to incoherent, non-Fermi liquid behavior. It also often gives …
Field-theoretic functional renormalization group formalism for non-Fermi liquids and its application to the antiferromagnetic quantum critical metal in two dimensions
To capture the universal low-energy physics of metals within effective field theories, one has
to generalize the usual notion of scale invariance and renormalizable field theory due to the …
to generalize the usual notion of scale invariance and renormalizable field theory due to the …
Quantum interference of hydrodynamic modes in a dirty marginal Fermi liquid
We study the electrical transport of a two-dimensional non-Fermi-liquid with disorder, and
we determine the first quantum correction to the semiclassical dc conductivity due to …
we determine the first quantum correction to the semiclassical dc conductivity due to …
Fluctuation spectrum of 2+ 1d critical fermi surface and its application to optical conductivity and hydrodynamics
H Guo - arXiv preprint arXiv:2311.03458, 2023 - arxiv.org
We extend the kinetic operator formalism developed in the companion paper [H. Guo, XXX]
to study the general eigenvalues of the fluctuation normal modes. We apply the formalism to …
to study the general eigenvalues of the fluctuation normal modes. We apply the formalism to …
Fluctuation spectrum of critical Fermi surfaces
H Guo - Physical Review B, 2024 - APS
We investigate the low-energy effective theory of a Fermi surface (FS) coupled to an Ising-
nematic quantum critical point in (2+ 1) spacetime dimensions with translation symmetry. We …
nematic quantum critical point in (2+ 1) spacetime dimensions with translation symmetry. We …
Fermi liquids beyond the forward-scattering limit: The role of nonforward scattering for scale invariance and instabilities
H Ma, SS Lee - Physical Review B, 2024 - APS
Landau Fermi liquid theory is a fixed-point theory of metals that includes the forward-
scattering amplitudes as exact marginal couplings. However, the fixed-point theory that only …
scattering amplitudes as exact marginal couplings. However, the fixed-point theory that only …
Generalized Hertz action and quantum criticality of two-dimensional Fermi systems
We reassess the structure of the effective action and quantum critical singularities of two-
dimensional Fermi systems characterized by the ordering wave vector Q ⃗= 0 ⃗. By …
dimensional Fermi systems characterized by the ordering wave vector Q ⃗= 0 ⃗. By …
Is the migdal-eliashberg theory for 2+ 1d critical fermi surface stable?
H Guo - arXiv preprint arXiv:2311.03455, 2023 - arxiv.org
We diagnose the stability of the Migdal-Eliashberg theory for a Fermi surface coupled to a
gapless boson in 2+ 1 dimensions. We provide a scheme for diagonalizing the Bethe …
gapless boson in 2+ 1 dimensions. We provide a scheme for diagonalizing the Bethe …