Novel Order Parameter to Characterize Valence-Bond-Solid States
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概要
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We propose an order parameter to characterize valence-bond-solid (VBS) states in quantum spin systems, given by the ground-state expectation value of a unitary operator appearing in the Lieb-Schultz-Mattis argument. We show that the order parameter changes the sign according to the configuration of the valence bonds. This allows us to determine the phase transition point in between different VBS states accurately. We demonstrate this theory in the bond-alternating Heisenberg chain and in the frustrated spin ladder.
- 理論物理学刊行会の論文
- 2002-06-28
著者
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Todo Synge
Theoretische Physik Eidgenossische Technische Hochschule:institute For Solid State Physics Universit
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Todo Synge
Theoretische Physik Eidgenossische Technische Hochschule:institute For Solid State Physics Universit
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Nakamura Masaaki
Department Of Applied Physics Faculty Of Science Tokyo University Of Science
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NAKAMURA Masaaki
Department of Applied Physics, Faculty of Science, Tokyo University of Science
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