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arXiv 1209.1637hep-thcond-mat.str-el
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2+1维共形场论的可压缩量子相位

Compressible quantum phases from conformal field theories in 2+1 dimensions

Subir Sachdev

摘要:

具有整体守恒U(1)电荷Q的共形场论(CFTs)可以通过化学势H -> H - μQ修改其哈密顿量H而变形为可压缩相。我们研究了2+1维CFTs上的显式S对偶映射可以执行。我们发现,这种结构自然会导致可压缩的相是超流体,固体,或非费米液体,更恰当地称为“玻色金属”在目前的情况下。玻色金属保持了所有的对称性,并且具有规范带电费米子的费米表面,即使在母CFT可以仅由玻色自由度表示的情况下。单极子算符被认为是固体的序参量,它们的磁荷与Q的乘积决定了晶胞的面积。我们讨论了全息理论的影响渐近AdS 4时空:S对偶性和π/双子场在这方面发挥了重要作用。

英文摘要:

Conformal field theories (CFTs) with a globally conserved U(1) charge Q can be deformed into compressible phases by modifying their Hamiltonian, H, by a chemical potential H -> H - μQ. We study 2+1 dimensional CFTs upon which an explicit S duality mapping can be performed. We find that this construction leads naturally to compressible phases which are superfluids, solids, or non-Fermi liquids which are more appropriately called `Bose metals' in the present context. The Bose metal preserves all symmetries and has Fermi surfaces of gauge-charged fermions, even in cases where the parent CFT can be expressed solely by bosonic degrees of freedom. Monopole operators are identified as order parameters of the solid, and the product of their magnetic charge and Q determines the area of the unit cell. We discuss implications for holographic theories on asymptotically AdS4 spacetimes: S duality and monopole/dyon fields play important roles in this connection.

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