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    Hall-on-Toric State: Descendant Laughlin State in the Chiral Zp Toric Code

    Robin Schäfer1,2,3, Claudio Chamon4,5, and Chris R. Laumann1,6

    • 1Department of Physics, Boston University, Boston, Massachusetts 02215, USA
    • 2Helmholtz-Zentrum Berlin für Materialien und Energie, Hahn-Meitner-Platz 1, 14109 Berlin, Germany
    • 3Dahlem Center for Complex Quantum Systems and Fachbereich Physik, Freie Universität Berlin, Arnimallee 14, 14195 Berlin, Germany
    • 4Department of Physics and Astronomy, Purdue University, West Lafayette, Indiana, 47907
    • 5Purdue Quantum Science and Engineering Institute, Purdue University, West Lafayette, Indiana, 47907
    • 6Max-Planck-Institut für Physik komplexer Systeme, 01187 Dresden, Germany

    Phys. Rev. Lett. 136, 166603 – Published 22 April, 2026

    DOI: https://doi.org/10.1103/f63q-vqz3

    Abstract

    We demonstrate that the chiral Zp toric code—the quintessential model of topological order—hosts additional, emergent topological phases when perturbed: descendant fractional quantum Hall-like states, which we term Hall-on-Toric. These hierarchical states feature fractionalized Zp charges and increased topological ground-state degeneracy. The Hall-on-Toric phases appear in the vicinity of the transitions between deconfined Zp phases with different background charge per unit cell, in a fixed nontrivial flux background. We confirm their existence through extensive infinite density matrix renormalization group (iDMRG) simulations, analyzing the topological entanglement entropy, entanglement spectra, and a generalized Hall conductance. Remarkably, the Hall-on-Toric states remain robust even in the absence of U(1) symmetry. Our findings reinforce the foundational interpretation of star and plaquette defects as magnetic and electric excitations, and reveal that this perspective extends to a much deeper level.

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