Study of CP(N-1) theta-vacua by cluster simulation of SU(N) quantum spin ladders

Study of CP(N-1) theta-vacua by cluster simulation of SU(N) quantum spin ladders

D-theory provides an alternative lattice regularization of the 2D CP(N-1) quantum field theory in which continuous classical fields emerge from the dimensional reduction of discrete SU(N) quantum spins. Spin ladders consisting of n transversely coupled spin chains lead to a CP(N-1) model with a vacu...

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Veröffentlicht in:Physical review letters 2005-01, Vol.94 (1), p.010603-010603
Hauptverfasser: Beard, B B, Pepe, M, Riederer, S, Wiese, U-J
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container_title Physical review letters
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creator Beard, B B
Pepe, M
Riederer, S
Wiese, U-J
description D-theory provides an alternative lattice regularization of the 2D CP(N-1) quantum field theory in which continuous classical fields emerge from the dimensional reduction of discrete SU(N) quantum spins. Spin ladders consisting of n transversely coupled spin chains lead to a CP(N-1) model with a vacuum angle theta=npi. In D-theory no sign problem arises and an efficient cluster algorithm is used to investigate theta-vacuum effects. At theta=pi there is a first order phase transition with spontaneous breaking of charge conjugation symmetry for CP(N-1) models with N>2.
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title Study of CP(N-1) theta-vacua by cluster simulation of SU(N) quantum spin ladders
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