Competing orders in the Dirac-like electronic structure and the non-linear sigma model with the topological terms

Abstract

The Dirac-like electronic structure can host a large number of competing orders in the form of mass terms. In particular, two different order parameters can be said to be dual to each other, when a static defect in one of them traps a quantum number (or "charge") of the other. We discuss that such complementary nature of the pair of the order parameters shows up in their correlation functions and dynamical properties when a quantum phase transition is driven by fluctuations of the one of the order parameters. Approaching the transition from the disordered (paramagnetic) side, the order parameter correlation function at the critical point is reduced, while such fluctuations enhance the correlation of the dual order parameter. Such complementary behaviors in the correlation function can be used to diagnose the nature of quantum fluctuations that is the driving force of the quantum phase transition.

10 pages, 5 figures

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• Dirac Fermions with Competing Orders: Non-Landau Transition with Emergent Symmetry
• Quantum phase transitions beyond Landau-Ginzburg theory in one-dimensional space revisited
• Disorder-induced metal-insulator transitions in three-dimensional topological insulators and superconductors
• Models of three-dimensional fractional topological insulators
• Quantum phase transitions in Dirac fermion systems
• Non-Abelian SU(2) gauge fields through density-wave order and strain in graphene
• Nematic order on the surface of a three-dimensional topological insulator
• Critical structure and emergent symmetry of Dirac fermion systems
• Fermi surface instabilities of symmetry-breaking and topological types on the surface of a three-dimensional topological insulator
• Obstructed Atomic Insulators and Superfluids of Fermions Coupled to ${\mathbb{Z}}_2$ Gauge Fields
• Critical behavior of QED${}_3$--Gross-Neveu-Yukawa Theory in an Arbitrary Gauge