Scattering of magnons at graphene quantum-Hall-magnet junctions
ORAL
Abstract
Motivated by recent non-local transport studies of quantum-Hall-magnet (QHM) states formed in monolayer graphene’s N = 0 Landau level (Wei et.al Science 362, 229-233; Zhou et.al Nature Physics 16, 154–158(2020)), we study the scattering of QHM magnons by gate-controlled junctions between states with different integer filling factors \nu. For the \nu = 1| − 1|1 geometry we find magnons are weakly scattered by electric potential variation in the junction region, and that the scattering is chiral when the junction lacks a mirror symmetry. For the \nu = 1|0|1 geometry, we find that kinematic constraints completely block magnon transmission if the incident angle exceeds a critical value. Our results explain the suppressed non-local-voltage signals observed in the \nu = 1|0|1 case.
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Presenters
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Nemin Wei
University of Texas at Austin
Authors
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Nemin Wei
University of Texas at Austin
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Chunli Huang
University of Texas at Austin
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Allan MacDonald
Physics, University of Texas at Austin, Physics Department, University of Texas at Austin, University of Texas at Austin, Department of physics, University of Texas at Austin, Department of Physics, University of Texas at Austin, University of Texas, Austin