Exchange-coupling-induced symmetry breaking in topological insulators

Peng Wei*, Ferhat Katmis, Badih A. Assaf, Hadar Steinberg, Pablo Jarillo-Herrero, Donald Heiman, Jagadeesh S. Moodera

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

278 Scopus citations


An exchange gap in the Dirac surface states of a topological insulator (TI) is necessary for observing the predicted unique features such as the topological magnetoelectric effect as well as to confine Majorana fermions. We experimentally demonstrate proximity-induced ferromagnetism in a TI, combining a ferromagnetic insulator EuS layer with Bi2Se3, without introducing defects. By magnetic and magnetotransport studies, including anomalous Hall effect and magnetoresistance measurements, we show the emergence of a ferromagnetic phase in TI, a step forward in unveiling their exotic properties.

Original languageAmerican English
Article number186807
JournalPhysical Review Letters
Issue number18
StatePublished - 30 Apr 2013
Externally publishedYes


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