Quantum criticality of U(1) gauge theories with fermionic and bosonic matter in two spatial dimensions

Details Quantum criticality of U(1) gauge theories with fermionic and bosonic matter in two spatial dimensions Quantum criticality of U(1) gauge theories with fermionic and bosonic matter in two spatial dimensions

2008-01-04

arxiv.org/abs/0801.0723v2

Phys. Rev. B 77, 155105 (2008)

Physics

Condensed Matter

Strongly Correlated Electrons

30 pages, 8 figures

Scientific paper

10.1103/PhysRevB.77.155105

We consider relativistic U(1) gauge theories in 2+1 dimensions, with N_b species of complex bosons and N_f species of Dirac fermions at finite temperature. The quantum phase transition between the Higgs and Coulomb phases is described by a conformal field theory (CFT). At large N_b and N_f, but for arbitrary values of the ratio N_b/N_f, we present computations of various critical exponents and universal amplitudes for these CFTs. We make contact with the different spin-liquids, charge-liquids and deconfined critical points of quantum magnets that these field theories describe. We compute physical observables that may be measured in experiments or numerical simulations of insulating and doped quantum magnets.

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