Bernard Plaçais

   

 CNRS research director at the Physics department of the Ecole Normale Supérieure 
Head of the Mesoscopic Physics group  of the  Laboratoire Pierre Aigrain   
Director of the french Mesoscopic Physics Network  CNRS-GDR Physique Quantique Mesoscopique (2010-17)
Partner of Graphene Flagship, Electronic devices (WP7).
Editorial board member :  J. Phys. Materials


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Address: Laboratoire Pierre Aigrain, Département de Physique de l'ENS, 24, rue Lhomond, 75005 Paris, France
Office: L294
Lab: L175
Phone: +33 1 44 32 3456
Fax: +33 1 44 32 3840

High frequency quantum transport in quantum Hall conductors  

               Quantificattion of the chrage relaxation resisitance                       AC current quantification                quantum noise of a single electron emitter                  admittance of a chiral inductor    
   Quantization of the charge relaxation resistance           AC currrent Quantization          Noise of a single electron emitter        Admittance of a quantum chiral inductor

Electron quantum optics in quantum Hall edge channels

   single electron source     electronic Hong Ou Mandel experiment     Pauli correlation dip    electronic Hong Ou Mandel experiment
      Single electron emitter               Hong-Ou-Mandel experiment        Fermionic Hong Ou Mandel dip           Electron fractionalization
                   

Graphene field-effect transistors

  graphene nano-transistor    80 GHz graphene on sapphire transistor     Kgated-constact transistor       current saturation of a Zener-Klein transistor 

               Nano G-FET                          80 GHz G-FET on saphire                      Gated contact G-FET                     Zener-Klein G-FET on hBN
    

Noise thermometry in graphene

  hot electrons in graphene electron-phonon-impurity superccollisisons in graphene   Hperbolic-phonon cooling       QHE-breakdon velocity and noise

             AC phonon cooling                Supercollision cooling             Hyperbolic phonon cooling                    QHE-breakdown velocity and noise        

Dirac Fermion Optics and Plasmonics in graphene

           Klein tunneling transistor                    Dirac Fermion Reflector measurement and simulation                     Graphene plasma resonance capacitor

       Klein tunneling reflector (principle)            Dirac Fermion Reflector / measurement  / simulation        40 GHz Plasma Resonance Capacitor / Admittance spectrum

Capacitance/scattering spectroscopy of Dirac and Volkov-Pankratov states in HgTe/CdHgTe Topological Heterojunctions 

Capacitance and scattering spectroscopy of Volokv-Pankrtov states               HgTE/CdHgTe-oxide-metal capacitor                 
Volkov-Pankratov-states                  high field phase diagramme                   Evanescent-wave admittance spectrum          Scattering spectroscopy of VP states         HgTe/CdHgTe capacitor 

Single carbon nanotube devices

       on demand single electron injection                 on demand single electron injection             trasnconductance cnt-FET
  Shot-noise in the Kondo regime      GHz carbon nanotube transitor     Transconductance at the quantum limit      

Vortices in rotating superfuids:  He-4 (2 Kelvin) and fermionic He-3 (2 milli-Kelvin)

            superfluid vortices in a tilted box              superfluid vortices in a tilted box                          NMR detection of vortex nucleation under neutron irradiation                 universal  nucleation rate under neutron irradiation             milli-Kelvin rotating cryostat
Healing length of vortices         Second-sound anisotropy (He-4)       Neutron vortex nuclation (He-3)             Kibble-Zurek quench (He-3)         Aalto's ROTA-2 cryostat (He-3)
            

Vortices in superconductors (basics) : DC transport, AC susceptibilité, flux-flow noise

            High-frequency spectrum of the efffective penetration depth in the vortex state (PbIn).  Low frequency corrsponds to the inductive response and the high-frequency tail to the viscous flux flow regime. Thee crossover is best described by the two-mode electrodynamics.       High-frequency spectrum of the efffective penetration depth in the vortex state (PbIn).  Low frequency corrsponds to the inductive response and the high-frequency tail to the viscous flux flow regime. Thee crossover is best described by the two-mode electrodynamics.          Peak effect in the surface pinning slippage strength        The flux-flow noise spectrum in increasing vortex velocity     The flux-flow noise spectrum in increasing vortex velocity  
                      Crticital currents (PbIn)              2-mode susceptibility (PnIn)            Collective pinning (Nb)                  Voltage noise  (PbIn)             Magnetic field noise (PbIn)

Vortices in superconductors (advanced)

       anisotropic flux-flow resistivity of UPt3              Soft and hard vortex cores of UPt3 vortices                         High-frequency spectrum of the efffective penetration depth in the vortex state og YBCO             Crticil currents in anisotropic NbSe2
          Topological  f-wave UPt3          Hard and soft vortex cores in UPt3 (credit : J. Sauls)           Anisotropic d-wave YBCO                        Layered 2H-NbSe2     

Interlude : bird watching

juvenile seagull (Le Croisic, Aug. 28, 2017)         juvenile night-heron (Brière, Aug. 24, 2017)

                Juvenile seagull                   Juvenile night-heron

Conferences and schools :

Rencontres du Vietnam 2017 :
Nanophysics, from fundamental to applications reloaded, Quy-Nhon august 2017

Rencontres du Vietnam 2013 :
Nanophysics, from fundamental to applications the return, Quy-Nhon  4-10 august 2013

Ecole de physique quantique mésoscopique 2012
Transport quantique électronique :  cohérence, interactions et symétries, Cargèse

Discussions Lavoisier 2011
Prospective workshop series on graphene physics and technology.
Orsay meeting on graphene eelctronics and spintronics.

Sessions du GDR de Physique Quantique mésoscopique  2009-2017
Mesoscopic Physcis network annual meetings in Aussois

Tremblay Summer School 2007-2010 :
"Nanoscience Ile de France" series, domaine du Tremblay

Rencontres de Moriond 2008 :
Quantum transport and Nanophysics, La Thuile 8-15 march 2008

Rencontres du Vietnam 2006 :
Nanophysics, from fundamental to applications, Hanoi  6-12 august 2006

International collaborations

GRAPHENE FLAGSHIP, WP7 : electronic devices  (2013-20)
logo flagship

ULTI  : Transnational Acces to Ultra Low Temperature Infrastructures, ESPOO-Finland (2000-08) 
    
CARDEQ FP6-EU-STREP  : Carbon Nanotube Devices at the Quantum Limit (2006-09)
CARDEQ

Lectures :

Ecole Cargèse du GDR Graphene and Co, April  2018
Electronic transport in graphene

Graphene Study,  Flagship Residential School, Kaprun, March 2015
Noise and Ballistics in graphene (parts 1 and 2)

Aalto University, April 2014
Electron Quantum Optics with Edge States, part 1
Electron Quantum Optics with Edge States, part 2

Tremblay Summer School, June 2012
Microwave graphene electronnics

Ecole Cargèse du GDR de Physique Mésoscopique, Oct. 2008
Transport dynamique dans les conducteurs mésoscopiques : aspects expérimentaux, part 1
Transport dynamique dans les conducteurs mésoscopiques : aspects expérimentaux, part 2      

Bibliography

Focus, Review and Outreach

Ancrage des vortex dans les supracondcuteurs, EDP Sciences, 2000     Special Issue Hot carriers in Graphene       cack-cover       Reflets_physique   JPMATTER