Emergence of spin-active channels at a quantum Hall interface

Amartya Saha, Suman Jyoti De, Sumathi Rao, Yuval Gefen, Ganpathy Murthy

Research output: Contribution to journalArticlepeer-review

7 Scopus citations


We study the ground state of a system with an interface between ν=4 and ν=3 in the quantum Hall regime. Far from the interface, for a range of interaction strengths, the ν=3 region is fully polarized but ν=4 region is unpolarized. Upon varying the strength of the interactions and the width of the interface, the system chooses one of two distinct edge/interface phases. In phase A, stabilized for wide interfaces, spin is a good quantum number, and there are no gapless long-wavelength spin fluctuations. In phase B, stabilized for narrow interfaces, spin symmetry is spontaneously broken at the Hartree-Fock level. Going beyond Hartree-Fock, we argue that phase B is distinguished by the emergence of gapless long-wavelength spin excitations bound to the interface, which can be detected by a measurement of the relaxation time T2 in nuclear magnetic resonance.

Original languageEnglish
Article numberL081401
JournalPhysical Review B
Issue number8
StatePublished - Feb 1 2021

Bibliographical note

Publisher Copyright:
© 2021 American Physical Society.

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics


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