Persistent optical gating of a topological insulator

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

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

The spin-polarized surface states of topological insulators (TIs) are attractive for applications in spintronics and quantum computing. A central challenge with these materials is to reliably tune the chemical potential of their electrons with respect to the Dirac point and the bulk bands. We demonstrate persistent, bidirectional optical control of the chemical potential of (Bi,Sb)2Te3 thin films grown on SrTiO3. By optically modulating a space-charge layer in the SrTiO3 substrates, we induce a persistent field effect in the TI films comparable to electrostatic gating techniques but without additional materials or processing. This enables us to optically pattern arbitrarily shaped p-and n-type regions in a TI, which we subsequently image with scanning photocurrent microscopy. The ability to optically write and erase mesoscopic electronic structures in a TI may aid in the investigation of the unique properties of the topological insulating phase. The gating effect also generalizes to other thin-film materials, suggesting that these phenomena could provide optical control of chemical potential in a wide range of ultrathin electronic systems.

Original languageEnglish (US)
Article number1500640
JournalScience Advances
Volume1
Issue number9
DOIs
StatePublished - Oct 2015

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insulators
optical control
quantum computation
thin films
photocurrents
space charge
electrostatics
electronic structure
microscopy
scanning
electronics
electrons

All Science Journal Classification (ASJC) codes

  • General

Cite this

Yeats, Andrew L. ; Pan, Yu ; Richardella, Anthony ; Mintun, Peter J. ; Samarth, Nitin ; Awschalom, David D. / Persistent optical gating of a topological insulator. In: Science Advances. 2015 ; Vol. 1, No. 9.
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Persistent optical gating of a topological insulator. / Yeats, Andrew L.; Pan, Yu; Richardella, Anthony; Mintun, Peter J.; Samarth, Nitin; Awschalom, David D.

In: Science Advances, Vol. 1, No. 9, 1500640, 10.2015.

Research output: Contribution to journalArticle

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AB - The spin-polarized surface states of topological insulators (TIs) are attractive for applications in spintronics and quantum computing. A central challenge with these materials is to reliably tune the chemical potential of their electrons with respect to the Dirac point and the bulk bands. We demonstrate persistent, bidirectional optical control of the chemical potential of (Bi,Sb)2Te3 thin films grown on SrTiO3. By optically modulating a space-charge layer in the SrTiO3 substrates, we induce a persistent field effect in the TI films comparable to electrostatic gating techniques but without additional materials or processing. This enables us to optically pattern arbitrarily shaped p-and n-type regions in a TI, which we subsequently image with scanning photocurrent microscopy. The ability to optically write and erase mesoscopic electronic structures in a TI may aid in the investigation of the unique properties of the topological insulating phase. The gating effect also generalizes to other thin-film materials, suggesting that these phenomena could provide optical control of chemical potential in a wide range of ultrathin electronic systems.

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