Quantum Hall states can be characterized by their chiral edge modes. Upon softening the edge potential, the edge has long been known to undergo spontaneous reconstruction driven by charging effects. In this Letter we demonstrate a qualitatively distinct phenomenon driven by exchange effects, in which the ordering of the edge modes at ν = 3 switches abruptly as the edge potential is made softer, while the ordering in the bulk remains intact. We demonstrate that this phenomenon is robust, and has many verifiable experimental signatures in transport.
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G. M. thanks Sid Parameswaran for illuminating discussions, and he acknowledges the Aspen Center for Physics (NSF Grant No. 1066293) for its hospitality, the U.S.-Israel BSF (Grants No. 2012120 and No. 2016130), and NSF-DMR 1306897 for support. Y. G. thanks Dmitry G. Polyakov for useful discussions, and he acknowledges ISF (Grant No. 1349/14), the DFG (Grants No. RO 2247/8-1, No. CRC 183), the IMOS Israel-Russia program, and the Joint Italy-Israel Lab (MIUR-QUANTRA) for support. The research of U. K. was supported in part by the INFOSYS scholarship for senior students.
Khanna, Udit; Murthy, Ganpathy; Rao, Sumathi; and Gefen, Yuval, "Spin Mode Switching at the Edge of a Quantum Hall System" (2017). Physics and Astronomy Faculty Publications. 517.