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SUMMARY:Spin-orbit coupling\, photoemission and light absorption from firs
 t-principles calculations - Cheol-Hwan Park (Seoul National University)
DTSTART:20161214T110000Z
DTEND:20161214T120000Z
UID:TALK69597@talks.cam.ac.uk
CONTACT:Joseph Nelson
DESCRIPTION:A theoretical prediction [1] that the spin polarization of\nph
 otoelectrons emitted from a topological insulator is highly tunable such t
 hat almost 100% polarization along any arbitrary direction can be achieved
  by tuning the polarization of light was followed by a number of independe
 nt experimental confirmations [2-5]. This photo-induced spin modulation ph
 enomenon involving topological insulators suggests a new kind of spin-pola
 rized electron sources [2]\; however\, there are some experimental results
  that cannot be explained by previous theoretical descriptions [1].\nIn th
 is presentation\, I will also discuss our recent theoretical investigation
  of the photoemission process from topological insulators [6] and interpre
 t the recent experimental observations [2\,4]. Last\, I will discuss how t
 he electronic structure\, photoemission and optical processes are affected
  by spin-orbit\ncoupling [7].\n\n[1] "C.-H. Park and S. G. Louie. Phys. Re
 v. Lett. *109*\, 097601 (2012).":https://doi.org/10.1103/PhysRevLett.109.0
 97601\n\n[2] "C. Jozwiak _et al_.\, Nat. Phys. *9*\, 293 (2013).":https://
 dx.doi.org/10.1038/nphys2572\n\n[3] "Z.-H. Zhu _et al_.\, Phys. Rev. Lett.
  *112*\, 076802 (2014).":https://doi.org/10.1103/PhysRevLett.112.076802\n\
 n[4] "Z. Xie _et al_.\, Nat. Commun. *5*\, 3382 (2014).":https://dx.doi.or
 g/10.1038/ncomms4382\n\n[5] "J. Sánchez-Barriga _et al_.\, Phys. Rev. X *
 4*\, 011046 (2014).":https://doi.org/10.1103/PhysRevX.4.011046\n\n[6] "Ji 
 Hoon Ryoo and C.-H. Park\, Phys. Rev. B *93*\, 085419 (2016).":https://doi
 .org/10.1103/PhysRevB.93.085419\n\n[7] Tae Yoon Kim and C.-H. Park\, unpub
 lished.
LOCATION:TCM Seminar Room\, Cavendish Laboratory
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