Random translation-invariant Hamiltonians and their spectral gaps
Ian Jauslin, Marius Lemm
We consider random translation-invariant quantum spin Hamiltonians on $\mathbb Z^D$ in which the nearest-neighbor interaction in every direction is randomly sampled and then distributed across the lattice. Our main result is that, under a small rank constraint, there is a positive probability that the Hamiltonian is gapped. This extends previous results on 1D spin chains to all dimensions. The argument additionally controls the local gap. As an application, we obtain a 2D area law for a cut-dependent ground state via recent AGSP methods of Anshu-Arad-Gosset.
This paper is available on the arXiv at arXiv:2111.06433.