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Gapped spin liquid in the breathing kagome Heisenberg antiferromagnet
Mohsin Iqbal, Didier Poilblanc, Norbert Schuch
We investigate the spin-1/2 Heisenberg antiferromagnet on the kagome lattice with breathing anisotropy (i.e. with weak and strong triangular units), constructing an improved simple…
Fermionic tensor networks for higher order topological insulators from charge pumping
Anna Hackenbroich, B. Andrei Bernevig, Norbert Schuch +1
We apply the charge pumping argument to fermionic tensor network representations of d-dimensional topological insulators (TIs) to obtain tensor network states for (d+1)-dimensional…
Topological Spin Liquids: Robustness under perturbations
Mohsin Iqbal, Helena Casademunt, Norbert Schuch
We study the robustness of the paradigmatic kagome Resonating Valence Bond (RVB) spin liquid and its orthogonal version, the quantum dimer model. The non-orthogonality of singlets…
Quantum chaos in the Brownian SYK model with large finite : OTOCs and tripartite information
Christoph Sünderhauf, Lorenzo Piroli, Xiao-Liang Qi +2
We consider the Brownian SYK model of interacting Majorana fermions, with random couplings that are taken to vary independently at each time. We study the out-of-time-ordered c…
Matrix product state algorithms for Gaussian fermionic states
Norbert Schuch, Bela Bauer
While general quantum many-body systems require exponential resources to be simulated on a classical computer, systems of non-interacting fermions can be simulated exactly using po…
Detecting subsystem symmetry protected topological order via entanglement entropy
David T. Stephen, Henrik Dreyer, Mohsin Iqbal +1
Subsystem symmetry protected topological (SSPT) order is a type of quantum order that is protected by symmetries acting on lower-dimensional subsystems of the entire system. In thi…