Local optical control of ferromagnetism and chemical potential in a topological insulator

Yeats, Andrew L.; Mintun, Peter J.; Pan, Yu; Richardella, Anthony; Buckley, Bob B.; Samarth, Nitin; Awschalom, David D.

doi:10.1073/pnas.1713458114

Title: Local optical control of ferromagnetism and chemical potential in a topological insulator

Journal Article · Tue Sep 12 00:00:00 EDT 2017 · Proceedings of the National Academy of Sciences of the United States of America

DOI:https://doi.org/10.1073/pnas.1713458114· OSTI ID:1405317

Yeats, Andrew L. ^[1]; Mintun, Peter J. ^[2]; Pan, Yu ^[3]; Richardella, Anthony ^[3]; Buckley, Bob B. ^[2]; Samarth, Nitin ^[3]; Awschalom, David D. ^[1]

Univ. of Chicago, Chicago, IL (United States); Argonne National Lab. (ANL), Argonne, IL (United States)
Univ. of Chicago, Chicago, IL (United States)
The Pennsylvania State Univ., University Park, PA (United States)

Many proposed experiments involving topological insulators (TIs) require spatial control over time-reversal symmetry and chemical potential. We demonstrate reconfigurable micron-scale optical control of both magnetization (which breaks time-reversal symmetry) and chemical potential in ferromagnetic thin films of Cr-(Bi,Sb)₂Te₃ grown on SrTiO₃. By optically modulating the coercivity of the films, we write and erase arbitrary patterns in their remanent magnetization, which we then image with Kerr microscopy. Additionally, by optically manipulating a space charge layer in the underlying SrTiO₃ substrates, we control the local chemical potential of the films. This optical gating effect allows us to write and erase p-n junctions in the films, which we study with photocurrent microscopy. Both effects are persistent and may be patterned and imaged independently on a few-micron scale. As a result, dynamic optical control over both magnetization and chemical potential of a TI may be useful in efforts to understand and control the edge states predicted at magnetic domain walls in quantum anomalous Hall insulators.

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Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States)

Sponsoring Organization:: Air Force Research Laboratory (AFRL), Air Force Office of Scientific Research (AFOSR); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22), Materials Sciences and Engineering Division; US Department of the Navy, Office of Naval Research (ONR); National Science Foundation (NSF); Argonne National Laboratory, Laboratory Directed Research and Development (LDRD)

Grant/Contract Number:: AC02-06CH11357

OSTI ID:: 1405317

Journal Information:: Proceedings of the National Academy of Sciences of the United States of America, Vol. 114, Issue 39; ISSN 0027-8424

Publisher:: National Academy of Sciences, Washington, DC (United States)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 15 works

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Title: Local optical control of ferromagnetism and chemical potential in a topological insulator

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