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PreprintCC BY 4.0arXiv

Spinless Charged Excitation at the Interface between a Conventional Topological Insulator and a Topological Mott Insulator

  • Cesar A. Gallegos
  • Andrew J. Millis
  • Steven R. White
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Abstract

We investigate the interface separating two topologically distinct insulating phases of matter using extensive density-matrix renormalization group calculations to study the triangular-lattice Hofstadter-Hubbard model with a spatially varying interaction strength, chosen to realize both integer quantum Hall and chiral spin liquid states in different spatial regions. We find that the integer quantum Hall-chiral spin liquid interface hosts a spinless charged excitation that is bound to the interface. This mode at the interface is identified through charge and spin pumping, and by direct calculations of low-lying excited states. We also characterize bulk excitations in both phases, finding evidence for fractionalization in the chiral spin liquid and for spin-triplet exciton formation in the integer quantum Hall phase.

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Cite

BibTeXRIS
BibTeX
@misc{gallegos2026spinless,
  title = {{Spinless Charged Excitation at the Interface between a Conventional Topological Insulator and a Topological Mott Insulator}},
  author = {Cesar A. Gallegos and Andrew J. Millis and Steven R. White},
  howpublished = {arXiv},
  year = {2026},
  month = nov,
  doi = {10.48550/arxiv.2607.14221},
  eprint = {2607.14221},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2607.14221},
  note = {CC BY 4.0},
}
RIS
TY  - UNPB
TI  - Spinless Charged Excitation at the Interface between a Conventional Topological Insulator and a Topological Mott Insulator
AU  - Cesar A. Gallegos
AU  - Andrew J. Millis
AU  - Steven R. White
PY  - 2026
DA  - 2026/11/02
PB  - arXiv
DO  - 10.48550/arxiv.2607.14221
UR  - https://arxiv.org/abs/2607.14221
AB  - We investigate the interface separating two topologically distinct insulating phases of matter using extensive density-matrix renormalization group calculations to study the triangular-lattice Hofstadter-Hubbard model with a spatially varying interaction strength, chosen to realize both integer quantum Hall and chiral spin liquid states in different spatial regions. We find that the integer quantum Hall-chiral spin liquid interface hosts a spinless charged excitation that is bound to the interface. This mode at the interface is identified through charge and spin pumping, and by direct calculations of low-lying excited states. We also characterize bulk excitations in both phases, finding evidence for fractionalization in the chiral spin liquid and for spin-triplet exciton formation in the integer quantum Hall phase.
ER  -