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000864698 1001_ $$0P:(DE-HGF)0$$aSchmoll, Philipp$$b0$$eCorresponding author
000864698 245__ $$aQuantum criticality on a chiral ladder: An SU(2) infinite density matrix renormalization group study
000864698 260__ $$aWoodbury, NY$$bAPS$$c2019
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000864698 520__ $$aIn this paper we study the ground-state properties of a ladder Hamiltonian with chiral SU(2)-invariant spin interactions, a possible first step toward the construction of truly two-dimensional nontrivial systems with chiral properties starting from quasi-one-dimensional ones. Our analysis uses a recent implementation by us of SU(2) symmetry in tensor network algorithms, specifically for infinite density matrix renormalization group. After a preliminary analysis with Kadanoff coarse graining and exact diagonalization for a small-size system, we discuss its bosonization and recap the continuum limit of the model to show that it corresponds to a conformal field theory, in agreement with our numerical findings. In particular, the scaling of the entanglement entropy as well as finite-entanglement scaling data show that the ground-state properties match those of the universality class of a c=1 conformal field theory (CFT) in (1+1) dimensions. We also study the algebraic decay of spin-spin and dimer-dimer correlation functions, as well as the algebraic convergence of the ground-state energy with the bond dimension, and the entanglement spectrum of half an infinite chain. Our results for the entanglement spectrum are remarkably similar to those of the spin-1/2 Heisenberg chain, which we take as a strong indication that both systems are described by the same CFT at low energies, i.e., an SU(2)_1 Wess-Zumino-Witten theory. Moreover, we explain in detail how to construct matrix product operators for SU(2)-invariant three-spin interactions, something that had not been addressed with sufficient depth in the literature.
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000864698 7001_ $$0P:(DE-HGF)0$$aHaller, Andreas$$b1
000864698 7001_ $$0P:(DE-Juel1)177780$$aRizzi, Matteo$$b2
000864698 7001_ $$0P:(DE-HGF)0$$aOrús, Román$$b3
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