Observation of chiral currents at the magnetic domain boundary of a topological insulator

Wang, Y. H.; Kirtley, J. R.; Katmis, F.; Jarillo-Herrero, P.; Moodera, J. S.; Moler, K. A.

doi:10.1126/science.aaa0508

Title: Observation of chiral currents at the magnetic domain boundary of a topological insulator

Journal Article · Fri Aug 28 00:00:00 EDT 2015 · Science

DOI:https://doi.org/10.1126/science.aaa0508· OSTI ID:1326858

Wang, Y. H. ^[1]; Kirtley, J. R. ^[2]; Katmis, F. ^[3]; Jarillo-Herrero, P. ^[3]; Moodera, J. S. ^[3]; Moler, K. A. ^[1]

Stanford Univ., Stanford, CA (United States); SLAC National Accelerator Lab., Menlo Park, CA (United States)
Stanford Univ., Stanford, CA (United States)
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)

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. Here, we used a scanning superconducting quantum interference device to show that current in a magnetized EuS/Bi₂Se₃ heterostructure flows at the edge when the Fermi level is gate-tuned to the surface band gap. We further induced micron-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. As a result, such magnetic structures, provide a platform for detecting topological magnetoelectric effects and may enable progress in quantum information processing and spintronics.

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Research Organization:: SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC02-76SF00515

OSTI ID:: 1326858

Report Number(s):: SLAC-PUB-16714

Journal Information:: Science, Vol. 349, Issue 6251; ISSN 0036-8075

Publisher:: AAASCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 14 works

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Electric coupling in scanning SQUID measurements Spanton, Eric M.; Rosenberg, Aaron J.; Wang, Yihua H. arXiv https://doi.org/10.48550/arxiv.1512.03373	text	January 2015

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