418 citations · 2.2k across the 78 of their papers we have counts for
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math-ph2013★ 29 cited
On gapped phases with a continuous symmetry and boundary operators
Sven Bachmann, Bruno Nachtergaele
We discuss the role of compact symmetry groups, G, in the classification of gapped ground state phases of quantum spin systems. We consider two representations of G on infinite sub…
math-ph2013★ 15 cited
An Area Law for the Bipartite Entanglement of Disordered Oscillator Systems
Bruno Nachtergaele, Robert Sims, Gunter Stolz
We prove an upper bound proportional to the surface area for the bipartite entanglement of the ground state and thermal states of harmonic oscillator systems with disorder, as meas…