P. Y. Solane

Publications (4)0 Total impact

• Article: Ultra-high magnetic field study of the layer split bands in Graphite

  R. J. Nicholas, P. Y. Solane, O. Portugall
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  ABSTRACT: We report studies of the magnetospectroscopy of graphite into a new regime of high energies and ultra-high magnetic fields which allows us to perform the first spectroscopic studies of the interlayer split off bands, $E_{1}$ and $E_{2}$. These bands can be well described by an asymmetric bilayer model and have only a small interlayer band gap asymmetry. We show that all of the properties of the electrons and holes can be described by a simple relativistic behaviour determined by $\gamma_{0}$ and $\gamma_{1}$.
  05/2013;
• Article: Origin of electron-hole asymmetry in graphite and graphene

  P. Plochocka, P. Y. Solane, R. J. Nicholas, J. M. Schneider, B. A. Piot, D. K. Maude, O. Portugall, G. L. J. A. Rikken
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  ABSTRACT: The electron-hole asymmetry has been measured in highly oriented pyrolitic graphite using magneto-optical absorption measurements. A splitting is observed for transitions at both the K point and the H point of the Brillouin zone of graphite where the effect of trigonal warping vanishes. This result is fully consistent with the Slonczewski, Weiss, and McClure Hamiltonian, providing the free-electron kinetic energy terms are included. Importantly, the free-electron terms enter via the Hamiltonian for an isolated carbon atom and provide a previously unsuspected source of electron-hole asymmetry in graphene.
  Phys. Rev. B. 06/2012; 85(24).
• Article: High Field magnetospectroscopy to probe the 1.4eV Ni color center in diamond

  P. Plochocka, O. Portugall, P. Y. Solane, E. Gheeraert, L. Ranno, E. Bustarret, N. Bruyant, I. Breslavetz, D. K. Maude, H. Kanda, G. L. J. A. Rikken
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  ABSTRACT: A magneto-optical study of the 1.4 eV Ni color center in boron-free synthetic diamond, grown at high pressure and high temperature, has been performed in magnetic fields up to 56 T. The data is interpreted using the effective spin Hamiltonian of Nazar\'e, Nevers and Davies [Phys. Rev. B 43, 14196 (1991)] for interstitial Ni$^{+}$ with the electronic configuration $3d^{9}$ and effective spin $S=1/2$. Our results unequivocally demonstrate the trigonal symmetry of the defect which preferentially aligns along the [111] growth direction on the (111) face, but reveal the shortcomings of the crystal field model for this particular defect.
  03/2012;
• Source

  Available from: B. A. Piot

  Article: The origin of electron-hole asymmetry in graphite

  P. Plochocka, P. Y. Solane, R. J. Nicholas, J. M. Schneider, B. A. Piot, D. K. Maude, O. Portugall, G. L. J. A. Rikken
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  ABSTRACT: The electron hole asymmetry has been measured in natural graphite using magneto-optical absorption measurements. A splitting is observed for the transitions at both the $K$-point and the $H$-point of the Brillouin zone of graphite where the effect of trigonal warping vanishes. This result is fully consistent with the SWM Hamiltonian providing the free electron kinetic energy terms are taken into account. An identical electron-hole asymmetry should be present in graphene.
  11/2011;