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TZID:Europe/Paris
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BEGIN:VEVENT
UID:1-412@lptms.universite-paris-saclay.fr
DTSTART:20160412T110000Z
DTEND:20160412T120000Z
DTSTAMP:20160325T115748Z
URL:http://www.lptms.universite-paris-saclay.fr/seminars/seminaire-du-lptm
 s-jean-noel-fuchs/
SUMMARY:Séminaire du LPTMS: Jean-Noël Fuchs - LPTMS\, salle 201\, 2ème 
 étage\, Bât 100\, Campus d'Orsay - 12 Avr 16 11:00
DESCRIPTION:Magnetic field properties of itinerant electrons in a quasicrys
 tal\nJean-Noël Fuch (LPS\, Univeristé Paris-Sud &amp\; LPTMC\, Universit
 é Paris 6)\nQuasicrystals are solids with long range order but without pe
 riodicity. Here we study the properties of electrons moving in a 2D quasic
 rystal in the presence of a perpendicular magnetic field. The motion of el
 ectrons on a two-dimensional isometric Rauzy tiling is described by a tigh
 t-binding model. A magnetic field perpendicular to the plane is applied\, 
 which couples to the orbital motion of electrons via a Peierls phase in th
 e hopping amplitudes and to the spin via a Zeeman coupling. For several ap
 proximants to the quasicrystal\, the energy spectrum in a magnetic field i
 s computed numerically with open or periodic boundary conditions. The resu
 lting Hofstadter butterfly is studied in detail (Landau levels\, labeling 
 of gaps\, etc). The grand potential is then obtained at a given temperatur
 e and chemical potential and its derivatives allow us to study the orbital
  magnetic susceptibility as well as the spin susceptibility of the Rauzy t
 iling. The spin susceptibility is a temperature-smoothed version of the ze
 ro-field density of states. The orbital susceptibility has a complicated s
 tructure - it changes sign several times - as a function of the chemical p
 otential except near the band edges where it is approximatively described 
 by an effective mass tensor.
CATEGORIES:seminars
LOCATION:LPTMS\, salle 201\, 2ème étage\, Bât 100\, Campus d'Orsay\, 15 
 Rue Georges Clemenceau\, Orsay\, 91405\, France
GEO:48.698185;2.181768
X-APPLE-STRUCTURED-LOCATION;VALUE=URI;X-ADDRESS=15 Rue Georges Clemenceau\,
  Orsay\, 91405\, France;X-APPLE-RADIUS=100;X-TITLE=LPTMS\, salle 201\, 2è
 me étage\, Bât 100\, Campus d'Orsay:geo:48.698185,2.181768
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