Commensurability, excitation gap and topology in quantum many-particle systems on a periodic lattice

Details Commensurability, excitation gap and topology in quantum many-particle systems on a periodic lattice Commensurability, excitation gap and topology in quantum many-particle systems on a periodic lattice

1999-11-10

arxiv.org/abs/cond-mat/9911137v1

Phys. Rev. Lett. 84, 1535 (2000).

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages in REVTEX

Scientific paper

10.1103/PhysRevLett.84.1535

Combined with Laughlin's argument on the quantized Hall conductivity, Lieb-Schultz-Mattis argument is extended to quantum many-particle systems (including quantum spin systems) with a conserved particle number, on a periodic lattice in arbitrary dimensions. Regardless of dimensionality, interaction strength and particle statistics (bose/fermi), a finite excitation gap is possible only when the particle number per unit cell of the groundstate is an integer.

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