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Off-diagonal long-range order implies vanishing charge gap
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DOI：10.1103/PhysRevB.104.L180501.png)
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摘要
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For a large class of quantum many-body systems with U(1) symmetry, we prove a general inequality that relates the (off-diagonal) long-range order with the charge gap. For a system of bosons or fermions on a lattice or in the continuum, the inequality implies that a ground state with off-diagonal long-range order inevitably has a vanishing charge gap, and hence is characterized by nonzero charge susceptibility. For a quantum spin system, the inequality implies that a ground state within a magnetization plateau cannot have transverse long-range order.
Keyword:
SYMMETRY-BREAKING
QUANTUM
STATES
EXCITATIONS
SYSTEMS
THEOREM
期刊
IF:
3.7
论文数:
15.4W
被引数:
41.0W
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引用论文
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PREAI
分享收藏Multimagnon bound states in the frustrated ferromagnetic one-dimensional chain.png)
PHYSICAL REVIEW B
OAAI
PHYSICAL REVIEW BIF3.7
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