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Non-reciprocal Coulomb drag between Chern insulators.

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  • 1International Center for Quantum Materials, School of Physics, Peking University, Beijing, 100871, China.

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We observed non-reciprocal Coulomb drag in ferromagnetic topological insulators, violating Onsager

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Area of Science:

  • Condensed Matter Physics
  • Topological Materials
  • Quantum Phenomena

Background:

  • Coulomb drag, the induction of voltage in one conductor by current in another, is typically reciprocal.
  • This effect is well-understood in nonmagnetic systems, adhering to Onsager's reciprocity.
  • Previous studies focused on nonmagnetic, strongly interacting systems.

Purpose of the Study:

  • To investigate Coulomb drag in magnetic topological insulators.
  • To explore the possibility of non-reciprocal Coulomb drag.
  • To understand the underlying mechanisms in these novel systems.

Main Methods:

  • Experimental measurements of Coulomb drag between two ferromagnetic Chern insulators.
  • Utilized current and circuit reversals to detect non-reciprocity.
  • Analyzed nonlinear current-voltage characteristics and temperature dependence.

Main Results:

  • Observed strong non-reciprocal Coulomb drag signals in both longitudinal and transverse directions.
  • These signals violate Onsager's reciprocity and appear in the multidomain state of Chern insulators.
  • Drag is linked to rectification of mesoscopic fluctuations, quantum shot noise, and magnetic dynamics.

Conclusions:

  • Demonstrated non-reciprocal Coulomb drag in magnetic topological systems for the first time.
  • Highlights the crucial role of magnetic dynamics and multidomain states.
  • Expands the study of Coulomb drag into the domain of topological magnetism.