Bilocal quantum criticality
| Autor: | Mathias S. Scheurer, Subir Sachdev, Harley D. Scammell |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Physics
Coupling High Energy Physics - Theory Strongly Correlated Electrons (cond-mat.str-el) FOS: Physical sciences Fermi surface Fixed point Condensed Matter - Strongly Correlated Electrons Criticality High Energy Physics - Theory (hep-th) Critical point (thermodynamics) Quantum mechanics Critical exponent Quantum Boson |
| Popis: | We consider 2+1 dimensional conformal gauge theories coupled to additional degrees of freedom which induce a spatially local but long-range in time $1/(\tau-\tau')^2$ interaction between gauge-neutral local operators. Such theories have been argued to describe the hole-doped cuprates near optimal doping. We focus on a SU(2) gauge theory with $N_h$ flavors of adjoint Higgs fields undergoing a quantum transition between Higgs and confining phases: the $1/(\tau-\tau')^2$ interaction arises from a spectator large Fermi surface of electrons. The large $N_h$ expansion leads to an effective action containing fields which are bilocal in time but local in space. We find a strongly-coupled fixed point at order $1/N_h$, with dynamic critical exponent $z > 1$. We show that the entropy preserves hyperscaling, but nevertheless leads to a linear in temperature specific heat with a co-efficient which has a finite enhancement near the quantum critical point. Comment: 30 pages, 4 figures |
| Databáze: | OpenAIRE |
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