Quadratic dispersion relations in gapless frustration-free systems
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DOI: 10.1103/physrevb.110.195140
Abstract: Recent case-by-case studies revealed that the dispersion of low energy excitations in gapless frustration-free Hamiltonians is often quadratic or softer. In this work, we argue that this is actually a general property of such systems.… read more here.
Keywords: free hamiltonians; frustration free; quadratic dispersion; gapless frustration ... See more keywords