First-order topological quantum phase transition in a strongly correlated ladder

  title={First-order topological quantum phase transition in a strongly correlated ladder},
  author={Simone Barbarino and Giorgio Sangiovanni and Jan Carl Budich},
  journal={Physical Review B},
We report on the discovery of a quantum tri-critical point (QTP) separating a line of first-order topological quantum phase transitions from a continuous transition regime in a strongly correlated one-dimensional lattice system. Specifically, we study a fermionic four-leg ladder supporting a symmetry-protected topological phase in the presence of on-site interaction, which is driven towards a trivial gapped phase by a nearest-neighbor interaction. Based on DMRG simulations, we show that, as a… 

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