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Floating topological phases
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DOI：10.1103/PhysRevB.102.125136.png)
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Abstract
En 中文
While quasi-two-dimensional (layered) materials can be highly anisotropic, their asymptotic long-distance behavior generally reflects the properties of a fully three-dimensional phase of matter. However, certain topologically ordered quantum phases with an emergent (2 + 1)-dimensional gauge symmetry can be asymptotically impervious to interplane couplings. We discuss the stability of such floating topological phases, as well as their diagnosis by means of a nonlocal order parameter. Such a phase can produce a divergent ratio rho(perpendicular to)/rho(parallel to) of the interlayer to intralayer resistivity as T -> 0, even in an insulator where both rho(perpendicular to) and rho(parallel to) individually diverge. Experimental observation of such a divergence would constitute proof of the existence of a topological (e.g., spin-liquid) phase.
Keywords:
MULTIPLE-QUANTUM-WELL
LATTICE GAUGE-THEORY
VALENCE BOND STATE
HALL STATES
FIELD
SUPERCONDUCTORS
FLUCTUATIONS
CONFINEMENT
TRANSITIONS
TRANSPORT
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