RETRACTED:  Observation of chiral currents at the magnetic domain boundary of a topological insulator.
A magnetic domain boundary on the surface of a three-dimensional topological insulator is predicted to host a chiral edge state, but direct demonstration is challenging. We used a scanning superconducting quantum interference device to show that current in a magnetized topological insulator heterostructure (EuS/Bi2Se3) flows at the edge when the Fermi level is gate-tuned to the surface band gap. We further induced micrometer-scale magnetic structures on the heterostructure and detected a chiral edge current at the magnetic domain boundary. The chirality of the current was determined by magnetization of the surrounding domain, and its magnitude by the local chemical potential rather than the applied current. Such magnetic structures provide a platform for detecting topological magnetoelectric effects and may enable progress in quantum information processing and spintronics.
Department of Physics and Applied Physics, Stanford University, Stanford, CA 94305, USA. Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, Menlo Park, CA 94025, USA. wangyhv@stanford.edu kmoler@stanford.edu.
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YH
Wang
Department of Physics and Applied Physics, Stanford University, Stanford, CA 94305, USA.
J R
JR
Kirtley
Francis Bitter Magnet Laboratory and Plasma Science and Fusion Center, Massachusetts Institute of Technology, Cambridge, MA 02139, USA. Department of Physics, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.
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F
Katmis
Department of Physics, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.
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P
Jarillo-Herrero
Francis Bitter Magnet Laboratory and Plasma Science and Fusion Center, Massachusetts Institute of Technology, Cambridge, MA 02139, USA. Department of Physics, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.
J S
JS
Moodera
Department of Physics and Applied Physics, Stanford University, Stanford, CA 94305, USA. Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, Menlo Park, CA 94025, USA. wangyhv@stanford.edu kmoler@stanford.edu.
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KA
Moler