@article{TEXTUAL,
      recid = {11067},
      author = {Yeats, Andrew L. and Pan, Yu and Richardella, Anthony and  Mintun, Peter J. and Samarth, Nitin and Awschalom, David  D.},
      title = {Persistent optical gating of a topological insulator},
      journal = {Science Advances},
      address = {2015-10-09},
      number = {TEXTUAL},
      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.},
      url = {http://knowledge.uchicago.edu/record/11067},
}