Study of CP(N-1) theta-vacua by cluster simulation of SU(N) quantum spin ladders |
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| Authors: | Beard B B Pepe M Riederer S Wiese U-J |
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| Institution: | Departments of Physics and Mechanical Engineering, Christian Brothers University, Memphis, TN 38104, USA. |
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| Abstract: | 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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