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[Fizinfo] Meghívó Dr. Martin Gmitra szemináriumára


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  • From: SIMON Ferenc <f.simon AT eik.bme.hu>
  • To: fizinfo AT lists.kfki.hu
  • Subject: [Fizinfo] Meghívó Dr. Martin Gmitra szemináriumára
  • Date: Tue, 29 Mar 2016 13:54:59 +0200 (CEST)

MEGHÍVÓ

A BME Fizika Tanszék szemináriumára:

Dr. Martin Gmitra
University of Regensburg, Germany

Spin-orbit coupling in graphene, few-layer graphene structures, graphite and role of functionalization

Időpont: 2016. április 12. (kedd) 10.00
Hely: BME, F. epulet, I. lépcsőhaz, 1. emelet, Schay terem
megközelítes: https://www.google.hu/maps/ AT 47.479918,19.0547192,19z

Minden érdeklődőt szeretettel várunk!
Üdvözlettel
Simon Ferenc

Absztrakt:

The spin-orbit interaction as a relativistic interaction destroys the ideal relativistic "touching cones" of electronic dispersion at the Dirac point in graphene. It opens a gap of tenths of micro eV. It turns out that this essentially sp material has its spin-orbit coupling derived almost exclusively from d-orbitals [1]. Few-layer graphene structures may be potentially useful for optical and transport applications, due to the possibility of electrical control of the band gaps. We show, by performing first-principles full potential linearized augmented plane waves calculations, that the spin-orbit physics in these structures and in graphite derives essentially from monolayer graphene. In particular, the spin splitting of the bands is due to the spin-orbit coupling of the d-orbitals. These give a splitting of the order of 24 microeV at the K point, as in graphene. Breaking the spatial inversion symmetry by a transverse electric field does not change this (intrinsic) picture, unlike what we know from graphene. Functionalization of graphene by adatoms or admolecules gives rise to an enhancement of spin splitting due to new principal linear spin-orbit band splittings driven by the breaking of the local pseudospin inversion symmetry and the emergence of spin flips on the same sublattice [2].

[1] M. Gmitra et al., Phys. Rev. B 80, 235431 (2009); S. Konschuh et al., Phys. Rev. B 82, 245412 (2010); S. Konschuh et al., Phys. Rev. B 85, 115423 (2012).
[2] M. Gmitra et al., Phys. Rev. Lett. 110, 246602 (2013); S. Irmer et al., Phys. Rev. B 91, 115141 (2015); K. Zollner et al., Phys. Rev. B 93, 045423 (2016).


----------------------------
Prof. Ferenc SIMON
BME Fizikai Intézet, Igazgatóhelyettes
TU-Budapest, Institute of Physics, deputy director
http://physics.bme.hu/kapcsolat
http://goliat.eik.bme.hu/~f.simon/
ph. lab.: (36-1) 463-1215
fax: (36-1) 463-4180
mob.: 36-30-452-4705


  • [Fizinfo] Meghívó Dr. Martin Gmitra szemináriumára, SIMON Ferenc, 03/29/2016

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