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Quantum-spin-chain realizations of conformal field theories

Physical Review B, ISSN: 0163-1829, Vol: 44, Issue: 6, Page: 2645-2651
1991
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We present a series of one-dimensional quantum Hamiltonians that, at certain critical points, realize the minimal series of conformal field theories with central charge less than one. The models consist of ferromagnetically coupled SU(2) spins in a transverse magnetic field. The infinite-spin (free-boson) limit is especially studied after performing the Holstein-Primakoff transformation. The analysis can be generalized to SU(3) quantum chains. These realize a different series of conformal field theories at criticality. © 1991 The American Physical Society.

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