Catégorie : Collaborations

Abstract : Many recent experiments addressed manifestations of electronic crystals, particularly the charge density waves, in nano-junctions, under electric field effect, at high magnetic fields, together with real space visualizations by STM and micro X-ray diffraction. This activity returns the interest to stationary or transient states with static and dynamic topologically nontrivial configurations: electronic vortices as dislocations, instantons as phase slip centers, and ensembles of microscopic solitons. Describing and modeling these states and processes calls for an efficient phenomenological theory which should take into account the degenerate order parameter, various kinds of normal carriers and the electric field. Here we notice that the commonly employed time-depend Ginzburg–Landau approach suffers with violation of the charge conservation law resulting in unphysical generation of particles which is particularly strong for nucleating or moving electronic vortices. We present a consistent theory which exploits the chiral transformations taking into account the principle contribution of the fermionic chiral anomaly to the effective action. The resulting equations clarify partitions of charges, currents and rigidity among subsystems of the condensate and normal carriers. On this basis we perform the numerical modeling of a spontaneously generated coherent sequence of phase slips – the spacetime vortices – serving for the conversion among the injected normal current and the collective one.

S. Brazovskii 1 N. Kirova 2
1 LPTMS – Laboratoire de Physique Théorique et Modèles Statistiques
2 LPS – Laboratoire de Physique des Solides

Ahmed Ghalgaoui 1 Ridha Horchani 2 Jijin Wang 1 Aimeric Ouvrard 1 Serge Carrez Bernard Bourguignon 1
1 ISMO – Institut des Sciences Moléculaires d’Orsay
2 LAC – Laboratoire Aimé Cotton

Adrien Devolder 1 Eliane Luc-Koenig 1 Osman Atabek 2 Michèle Desouter-Lecomte 3 Olivier Dulieu 1
1 LAC – Laboratoire Aimé Cotton
2 ISMO – Institut des Sciences Moléculaires d’Orsay
3 LCP – Laboratoire de Chimie-Physique

Marie-Christine Mathieu 1 Suzette Delaloge 2 Corinne Balleyguier 3 Charlotte Benoit 4 Christophe Tourasse 5 Martine Boisserie-Lacroix 6 Alexis Toullec 7 Marie-Pierre Fontaine-Aupart 8 René Farcy 9
1 IGR – Institut Gustave Roussy
2 Pathologie mammaire
Département de médecine oncologique [Gustave Roussy]
3 Service de Radiologie Adultes
4 Nodea Medical
5 Hôpital privé Jean Mermoz
6 Centre Régional de Lutte Contre le Cancer Bergognié
7 Nodea Medical
8 ISMO – Institut des Sciences Moléculaires d’Orsay
9 LAC – Laboratoire Aimé Cotton

Marie-Christine Mathieu 1 Alexis Toullec 2 Charlotte Benoit 3 Richard Berry Pierre Validire 4 Pauline Beaumel Yves Vincent Pierre Maroun 5 Philippe Vielh 6 Lama Alchab René Farcy 7 Helene Moniz-Koum 2 Marie-Pierre Fontaine-Aupart 8 Suzette Delaloge 9 Corinne Balleyguier 10, 11
1 Pathologie morphologique
Département de biologie et pathologie médicales [Gustave Roussy]
2 Nodea Medical
3 Nodea Medical
4 Dpt pathologie
5 Département de radiothérapie [Gustave Roussy]
6 Laboratoire de recherche translationnelle
Direction de la recherche [Gustave Roussy]
7 LAC – Laboratoire Aimé Cotton
8 ISMO – Institut des Sciences Moléculaires d’Orsay
9 Département de médecine oncologique [Gustave Roussy]
10 BFSNC – IFR54 – Bases fondamentales et stratégies nouvelles en cancérologie
11 Imagerie diagnostique (radiologie / échographie)
Département d’imagerie médicale [Gustave Roussy]

Kelly Woog 1 Richard Legras 2
1 LAC – Laboratoire Aimé Cotton
2 LuMIn – Laboratoire Lumière, Matière et Interfaces

Richard Legras 1 Alain Gaudric 2 Kelly Woog 3
1 LuMIn – Laboratoire Lumière, Matière et Interfaces
2 Hôpital Lariboisière-Fernand-Widal [APHP]
3 LAC – Laboratoire Aimé Cotton

Yunbin Hu Peng Xie 1 Marzio de Corato Alice Ruini Shen Zhao 2 Felix Meggendorfer Lasse Arnt Straasø Loïc Rondin 3, 4 Patrick Simon 5 Juan Li 6 Jonathan Finley 7 Michael Ryan Hansen Jean‐sébastien Lauret 2, 4 Elisa Molinari Xinliang Feng 8 Johannes Barth Carlos-Andres Palma Deborah Prezzi Klaus Müllen 8 Akimitsu Narita 8
1 Chongqing Medical University
2 LAC – Laboratoire Aimé Cotton
3 LPQM – Laboratoire de Photonique Quantique et Moléculaire
4 NOOS – Nano Optique et Spectroscopy
LuMIn – Laboratoire Lumière, Matière et Interfaces
5 Musée d’Anthropologie Préhistorique
6 Physik Department [Garching]
7 TUM – Technische Universität Munchen – Université Technique de Munich [Munich, Allemagne]
8 MPI-P – Max-Planck-Institut für Polymerforschung

Loïc Toraille 1 Koceila Aizel 2 Elie Balloul 3 Chiara Vicario 3 Cornelia Monzel 3 Mathieu Coppey 3 Emilie Secret 4 Jean-Michel Siaugue 5 Joao Sampaio 6 Stanislas Rohart 6 Nicolas Vernier 7 Louise Bonnemay 8 Thierry Debuisschert 9 Loïc Rondin 1, 10 Jean-François Roch 1 Maxime Dahan 11
1 LuMIn – Laboratoire Lumière, Matière et Interfaces
2 CEA-LETI – Commissariat à l’énergie atomique et aux énergies alternatives – Laboratoire d’Electronique et de Technologie de l’Information
3 PCC – Laboratoire Physico-Chimie Curie [Institut Curie]
4 PHENIX – PHysicochimie des Electrolytes et Nanosystèmes InterfaciauX
5 PHENIX – PHysicochimie des Electrolytes et Nanosystèmes InterfaciauX
6 LPS – Laboratoire de Physique des Solides
7 IEF – Institut d’électronique fondamentale
8 PCC – Physico-Chimie-Curie
9 Thales Research and Technology [Palaiseau]
10 NOOS – Nano Optique et Spectroscopy
LuMIn – Laboratoire Lumière, Matière et Interfaces
11 LKB (Lhomond) – Laboratoire Kastler Brossel

Abstract : We study the non-linear conductance G∼∂2I/∂V2|V=0G∼∂2I/∂V2|V=0 in coherent quasi-1D weakly disordered metallic wires. The analysis is based on the calculation of two fundamental correlators (correlations of conductance’s functional derivatives and correlations of injectivities), which are obtained explicitly by using diagrammatic techniques. In a coherent wire of length LL, we obtain G∼0.006E−1ThG∼0.006ETh−1 (and ⟨G⟩=0⟨G⟩=0), where ETh=D/L2ETh=D/L2 is the Thouless energy and DD the diffusion constant; the small dimensionless factor results from screening, i.e. cannot be obtained within a simple theory for non-interacting electrons. Electronic interactions are also responsible for an asymmetry under magnetic field reversal: the antisymmetric part of the non-linear conductance (at high magnetic field) being much smaller than the symmetric one, Ga∼0.001(gETh)−1Ga∼0.001(gETh)−1, where g≫1g≫1 is the dimensionless (linear) conductance of the wire. Weakly coherent regimes are also studied: for Lφ≪LLφ≪L, where LφLφ is the phase coherence length, we get G∼(Lφ/L)7/2E−1ThG∼(Lφ/L)7/2ETh−1, and Ga∼(Lφ/L)11/2(gETh)−1≪GGa∼(Lφ/L)11/2(gETh)−1≪G (at high magnetic field). When thermal fluctuations are important, LT≪Lφ≪LLT≪Lφ≪L where LT=D/T−−−−√LT=D/T, we obtain G∼(LT/L)(Lφ/L)7/2E−1ThG∼(LT/L)(Lφ/L)7/2ETh−1 (the result is dominated by the effect of screening) and Ga∼(LT/L)2(Lφ/L)7/2(gETh)−1Ga∼(LT/L)2(Lφ/L)7/2(gETh)−1. All the precise dimensionless prefactors are obtained. Crossovers towards the zero magnetic field regime are also analysed.

Christophe Texier 1, 2 Johannes Mitscherling 1, 3
1 LPTMS – Laboratoire de Physique Théorique et Modèles Statistiques
2 LPS – Laboratoire de Physique des Solides
3 Max Planck Institute for Solid State Research