Space group symmetries and low lying excitations of many-body systems at
integer fillings [PDF]
Rahul RoyWe show that many-body systems with conserved particle number which have the symmetries corresponding to a nonsymmorphic space group have low lying excitations for certain integer values of the particle number per unit cell. These results may be interpreted as a generalization of some band touching theorems to interacting systems.View original: http://arxiv.org/abs/1212.2944
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