12 citations · 22 across the 9 of their papers we have counts for
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math-ph2018
A Schrödinger Operator Approach to Higher Spin XXZ Systems on General Graphs
Christoph Fischbacher
We consider the spin- XXZ-Hamiltonian on general graphs and show its equivalence to a direct sum of discrete many-particle Schrödinger type operators on what we ca…
math.FA2018
The Closed Extensions of a Closed Operator
Christoph Fischbacher
Given a densely defined and closed operator acting on a complex Hilbert space , we establish a one-to-one correspondence between its closed extensions and subspace…
math-ph2018★ 12 cited
Droplet states in quantum XXZ spin systems on general graphs
Christoph Fischbacher, Günter Stolz
We study XXZ spin systems on general graphs. In particular, we describe the formation of droplet states near the bottom of the spectrum in the Ising phase of the model, where the Z…