Séminaires Nanoélectronique Quantique

Retrouver tous les "Séminaires Nanoélectronique Quantique" passés et à venir dans cette rubrique.

Le prochain séminaire aura lieu le :
Mardi 28 mars 2017 à 14h
Salle Rémy Lemaire - Institut Néel
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Attention :
Veuillez noter que l’horaire du séminaire a changé. Il commencera à 14h au lieu de 15h.

Spin to charge conversion at room temperature using spin orbit coupling and recently discovered topological insulators de Laurent Vila (SPINTEC)

Novel operational scheme of devices can be envisioned if an efficient charge to spin current interconversion can be achieved in non-magnetic materials. In this presentation we will focus on experiments taking advantage of spin orbit coupling and realizing spin to charge conversion at the surface of topological insulators. We will also compare their efficiency, and interest, respect to more conventional Spin Hall and Rashba Edelstein effects.
The spin Hall Effect occurs in material’s bulk. We will show that incorporating impurities in a matrix [1] could allow the fine tuning of the resistivity, the spin diffusion length (lsf) and the spin Hall angle (SHA) of alloys. Moreover, by taking advantage of the side jump contribution, the SHA becomes dependent on the longitudinal resistivity, and very large SHA can be achieved at high impurity concentration, reaching 0.5 (or 50%) in our best case.
Interfaces can also be an efficient way to perform charge to spin conversion using the Rashba interaction. Following our first experimental observation on Ag/Bi bilayers [2], we studied the 2D electron system that exists at the interface between STO and LAO. We will show that the Rashba-Edelstein effect at low temperature is at least one order of magnitude larger in this system and can be tuned by an external gate, leading even to its sign reversal [3].
We will then discuss the case of Topological Insulators and on the importance of finding suitable heterostructures that preserve the topological states. We will present results on strained thin films of Sn and HgTe. These material has been recently predicted to be a Topological Insulator as confirmed by spectroscopy measurements. Interestingly we could achieved unprecedented conversion rates at room temperature in these systems [4].
Finally we will give some elements to draw an appropriate comparison between these different systems and physical mechanisms, in order to identify best candidates for future spintronics devices.

[1] P. Laczkowski et al. Appl. Phys. Lett. 104, 142403 (2014) ; Phys. Rev. Lett. under review
[2] J.C. Rojas Sanchez et al. Nat. Commun. 4:2944 doi : 10.1038/ncomms3944 (2013)
[3] E. Lesne et al, Nat. Mat. 15, 1261 (2016), DOI : 10.1038/NMAT4726
[4] J.C. Rojas Sanchez et al, Phys. Rev. Lett. 116, 096602 (2016)

Contact : Laurent Vila

A venir

11 avril 2017
Teun Klapwijk (TU Delft)

2 mai 2017
Tim Duty (University of New South Wales, Sydney)


21 mars 2017
Spin Dynamics in Out-of-Equilibrium Superconductors de Charis Quay (Laboratoires de Physique des Solides, Université Paris Sud)

14 mars 2017
From CMOS transistors to CMOS spin qubits de Marc Sanquer (INAC/PHELIQS/LATEQS CEA & UGA)

14 february 2017
Quantized circular photogalvanic effect in Weyl semimetals frAdolfo Grushin (Department of Physics, UC Berkeley et Institut Néel, CNRS & UGA)

7 février 2017
Confining the state of light to a quantum manifold by engineered two-photon loss de Zaki Leghtas (Laboratoire Pierre Aigrain - Ecole Normale Supérieure)

31 janvier 2017
Many-Body Localization Basics - Recent Highlights - Experimental possibilities de Nicolas Laflorencie (Laboratoire de Physique Théorique, Toulouse)

24 janvier 2017
Fluctuation theorems in engineered environments de Marcelo F. Santos (Universidade Federal do Rio de Janeiro, Brésil)

17 janvier 2017
THz Spectroscopy on Disordered Superconductors and the “Superconducting Dome” of Granular Aluminum de Marc Scheffler (Physikalisches Institut, University of Stuttgart, Germany)

10 janvier 2017
Mesoscopic Spectroscopy with Josephson Junctions de Caglar GIRIT (Collège de France, Paris)

13 décembre 2016
Ultrastrong light-matter with propagating photons de Juan José García Ripoll (Institute of Fundamental Physics, Spain)

10 novembre 2016
Exciton states mixing and second harmonics generation in transition metal dichalcogenide monolayers de Mikhail Glazov (Ioffe Institute, Russie)

11 octobre 2016
Quantum Phase Slips and Voltage Fluctuations de Andrei D. Zaikin (Karlsruhe Institute of Technology (KIT), Germany)

4 octobre 2016
2D solids : optical spectroscopies and nano-optomechanics de Antoine Reserbat-Plantey (ICFO Barcelone)



Date limite de candidature - Programme des doctorants 2017

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Auditions - Programme des doctorants 2017

jeudi 8 juin 2017 - 08h00 -

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PHOTOVOLTAÏQUE : Couches minces et concepts avancés

mercredi 31 mai 2017 - 08h30 - Salle de Conférences - Bât. A, 2ème ét, Campus CNRS, Polygone scientifique

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jeudi 13 avril 2017 - 09h00 - Amphithéâtre P-P015 - Phelma Polygone

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