@article{7f3c622c1f7c47f28714f38b6d084d44,
title = "Tuning a Schottky barrier in a photoexcited topological insulator with transient Dirac cone electron-hole asymmetry",
abstract = "The advent of Dirac materials has made it possible to realize two-dimensional gases of relativistic fermions with unprecedented transport properties in condensed matter. Their photoconductive control with ultrafast light pulses is opening new perspectives for the transmission of current and information. Here we show that the interplay of surface and bulk transient carrier dynamics in a photoexcited topological insulator can control an essential parameter for photoconductivity - the balance between excess electrons and holes in the Dirac cone. This can result in a strongly out of equilibrium gas of hot relativistic fermions, characterized by a surprisingly long lifetime of more than 50 ps, and a simultaneous transient shift of chemical potential by as much as 100 meV. The unique properties of this transient Dirac cone make it possible to tune with ultrafast light pulses a relativistic nanoscale Schottky barrier, in a way that is impossible with conventional optoelectronic materials.",
author = "M. Hajlaoui and E. Papalazarou and J. Mauchain and L. Perfetti and A. Taleb-Ibrahimi and F. Navarin and M. Monteverde and P. Auban-Senzier and Pasquier, {C. R.} and N. Moisan and D. Boschetto and M. Neupane and Hasan, {M. Z.} and T. Durakiewicz and Z. Jiang and Y. Xu and I. Miotkowski and Chen, {Y. P.} and S. Jia and Ji, {H. W.} and Cava, {R. J.} and M. Marsi",
note = "Funding Information: We thank M.O. Goerbig, J.-N. Fuchs and G. Montambaux for very interesting discussions. Material synthesis at Purdue is supported by the DARPA MESO program (Grant N66001-11-1-4107). Z.J. thank support from the DOE (DE-FG02-07ER46451). T.D. was funded by LDRD and BES programs at LANL, under the auspices of the DOE for Los Alamos National Security LLC and by Office of Basic Energy Sciences, Division of Material Sciences. M.N. and M.Z.H. are supported by NSF-DMR-1006492. Crystal growth and electronic characterization in Princeton were supported by US DARPA grant N6601-11-1-4110. The FemtoARPES activities were funded by the RTRA Triangle de la Physique, the Ecole Polytechnique, the EU/FP7 under the contract Go Fast (Grant No. 280555), the ANR (Grant ANR-08-CEXCEC8-011-01) and the Labex PALM. Publisher Copyright: {\textcopyright} 2014 Macmillan Publishers Limited. All rights reserved.",
year = "2014",
month = jan,
day = "6",
doi = "10.1038/ncomms4003",
language = "English (US)",
volume = "5",
journal = "Nature Communications",
issn = "2041-1723",
publisher = "Nature Publishing Group",
}