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DTSTART:20160404T113000
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URL:https://murmitoyen.com/events/vanille/udem/detail/683137-spin-exciton-s
 cattering-and-resonant-structure-in-the-surface-density-of-states-in-smb6-
 a-possible-topologic-insulatorn-peter-s-riseborough-temple
LOCATION:Université de Montréal - Pavillon J.-Armand-Bombardier\, 5155\, 
 chemin de la rampe \, Montréal\, QC\, Canada\, H3T 2B2
SUMMARY:Spin Exciton Scattering and Resonant Structure in the Surface Densi
 ty of States in SmB6 a possible topologic Insulator– Peter S. Riseboroug
 h\, Temple
DESCRIPTION:Peter Riseborough\, Professor of Physics\, Temple University\,
  1925 N. 12th Street\, Philadelphia\, PA 19122\, USA.
\nThe compound SmB6
  is a Kondo Insulator\, where the lowest-energy bulk electronic excitation
 s are spin excitons. A spin exciton is an excitation of an enhanced Pauli 
 paramagnetic material which has an excitation energy smaller than the semi
 conducting gap. The spin exciton energy is very sharp since the excitation
  cannot decay into electron hole pairs. SmB6 also has surface states that 
 are subjected to strong spin-orbit coupling. It has also been suggested th
 at SmB6 is a topological insulator. Here we show that\, despite the absenc
 e of time-reversal symmetry breaking and the presence of strong spin-orbit
  coupling\, the chiral spin texture of the Weyl cone is not completely pro
 tected. In particular\, we show that the spin-exciton mediated scattering 
 produces features in the surface electronic spectrum at energies separated
  from the surface Fermi-energy by the spin-exciton energy. Despite the fea
 tures being far removed from the surface Fermi-energy\, they are extremely
  temperature dependent. The temperature variation occurs over a characteri
 stic scale determined by the dispersion of the spin exciton. The structure
 s have been observed by electron spectroscopy at low temperatures and by i
 nelastic planer tunneling.
\nSite web du groupe de Pr Riseborough
\n 
\n
 Cette conférence est présentée par le RQMP Versant Nord du Départemen
 t de physique de l'Université de Montréal et le Département de génie
  physique de Polytechnique Montréal.
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