"Unveiling excitonic properties of magnons in a quantum Hall ferromagnet."

The next virtual meeting of the GDR HOWDI will be given by Preden Rouleau (CEA) next Tuesday (July 20) at 11h.

"Unveiling excitonic properties of magnons in a quantum Hall ferromagnet."

Zoom connection informations are attached below.

Abstract of the talk :

Magnons enable transferring a magnetic moment or spin over macroscopic distance. In quantum Hall ferromagnets, it has been predicted in the early 90s [1] that spin and charge are entangled, meaning that any change of the spin texture modifies the charge distribution. As a direct consequence of this entanglement, magnons carry an electric dipole moment. Here we report the first evidence of the existence of this electric dipole moment in a graphene quantum Hall ferromagnet [2,3] using a Mach-Zehnder interferometer as a quantum sensor. As magnons propagate towards the interferometer across the insulating bulk, their electric dipole moment modifies the Aharonov-Bohm flux through the interferometer, affecting both the phase and visibility of the interferences. In particular, we relate the phase shift to the sign of this electric dipole moment, the exponential loss of visibility to the flux of emitted magnons, and we show that the magnon emission is a Poissonian process. Finally, we probe the emission energy threshold of the magnons close to filling factor ν=1. For transient states, between ν=0 and ν=1, we observe that the emission energy threshold diminishes towards zero, which might be linked to the emergence of gapless mode predicted in the canted-antiferromagnetic (CAF) phase at ν=0 [4-5]. Being able to couple the spin degree of freedom to an electrostatic potential is a remarkable property of quantum Hall ferromagnets that could be very promising for spintronics.

[1] Sondhi, S. L., Karlhede, A., Kivelson, S. A. & Rezayi, E. H. Skyrmions and the crossover from the integer to fractional quantum Hall effect at small Zeeman energies. Phys. Rev. B 47, 16419–16426 (1993).

[2] Yang, K., Das Sarma, S. & MacDonald, A. H. Collective modes and skyrmion excitations in graphene SU (4) quantum Hall ferromagnets. Phys. Rev. B 74, (2006).

[3] Wei, N., Huang, C. & MacDonald, A. H. Scattering of magnons at graphene quantum-Hall-magnet junctions. Phys. Rev. Lett. 126, 117203 (2021)

[4] Brey, L., Fertig, H. A., Côté, R. & MacDonald, A. H. Skyrme Crystal in a Two-Dimensional Electron Gas. Phys. Rev. Lett. 75, 2562–2565 (1995).

[5] Jolicoeur, T. & Pandey, B. Quantum Hall skyrmions at ν=0,±1 in monolayer graphene. Phys. Rev. B 100, (2019).

Sujet : Séminaire GDR HOWDI - Preden ROULLEAU 20/07 11am

Heure : 20 juil. 2021 11:00 AM Paris

https://zoom.us/j/96918566063?pwd=bmRFNmpkWUl1bVdiUTRUejNQTzg1dz09

Monday, June 17, 2021 (14h) :
Spin and valley properties in transition metal dichalcogenide: from monolayers to hybrid structures
See détails here

Starting May 2021, the GDR HOWDI offers its members a monthly virtual meeting with a guest speaker followed by a debate.

To break the scientific isolation in this period of pandemic, the GDR HOWDI offers its members a monthly virtual meeting with a guest speaker followed by a debate. The themes of the 4 axes of the GDR will be covered in turn and special attention will be given to the participation of young researchers (doctoral student at the end of their thesis or postdoc).

The first edition will take place on Friday May 21 with the participation of Piran Kidambi (Vanderbilt Univ., USA)

The zoom link will be sent via the GDR newsletter and on this web page.

Do not hesitate to send us your suggestions of speakers for the next editions

Wednesday afternoon, March 24th, 2021
Due to the ongoing sanitary crisis, it is still impossible to gather the community of our new GDR "HOWDI" physically. However, we will celebrate this new start with a short virtual kick-off meeting, on Wed. March 24, 2021 afternoon. The program of the meeting will be announced shortly; it will consist of a general presentation of the thematic lines of the new GDR, a series of selected focused scientific talks and an open discussion about your needs and wishes for the future of the GDR.

Please check the preliminary program here.

To join the meeting please use this zoom link
ID de réunion : 831 4177 7570 ; Code secret : 956936

HOWDI: HeterOstructures of van der Waals materials with low DImensionality
For the coming five years, our network (GDR after "groupement de recherche") will cover the study of van der Waals heterostructures, following four main directions:
 synthesis, nanofabrication, caracterisations
 electronic transport and its relationship with other fields
 optics, excitonics, photonics
 magnetism, spintronics, electronic correlations

Help us build the new GDR for 2021

The National part of the GDR "graphene and co" expires at the end of 2020. We are currently building a new GDR project. This concerns only french teams. The internation GDR remains active for the next years.

If you want to help or join the network, please contact us at :
christophe.voisin at ens.fr

More details

The graphene conference will be held in Grenoble (France) June 2-5, 2020

Annual Graphene conference, Grenoble, France, June 2-5, 2020

The 10th edition of Graphene Conference series, the largest European Event in Graphene and 2D Materials, will be organized in Grenoble (France) from the 2nd until the 5th of June 2020.

Graphene2020 will cover again the whole value chain of “Graphene and 2D Materials Innovation” from most recent scientific discoveries to breakthroughs in large scale material production and integration towards the development of innovative and competitive commercial applications.

http://www.grapheneconf.com/2020/index.php

Graphene2020 recent updates:

3 Nobel Keynotes (K. von Klitzing, A. Fert and A. Geim)
85 Invited Speakers (expected)
40-50 Exhibitors (expected)
6 Parallel Workshops
1 Industrial Forum to get an updated understanding of Graphene
based technologies from worldwide industries
1 Brokerage event to foster technical cooperation in the field of Graphene

Regarding the GDR-I community, the GDR "Graphene and co" offers grants to support the participation of PhD students by raising the
registration fees. Details are here.
Do not hesitate to apply directly on the graphene2020 website !!

The annual meeting 2019 of our research network will be held in Bad Herrenalb (in the German Black Forest, right at the French border), oct. 27-30, 2019. See more...

Annual Graphene conference, Roma, Italia, June 25-28, 2019

The 9th edition of Graphene Conference series, the largest European Event in Graphene and 2D Materials, will be organized in Roma (Italy) from the 25th until the 28th of June 2019.

Graphene2019 will cover again the whole value chain of “Graphene and 2D Materials Innovation” from most recent scientific discoveries to breakthroughs in large scale material production and integration towards the development of innovative and competitive commercial applications.

http://www.grapheneconf.com/2019/index.php

Graphene2019 recent updates:

• 72 Keynotes (including M. Grätzel, T. Heinz, A.H. Castro Neto, H-M Cheng, P. Jarillo-Herrero, …)
• 85 Invited Speakers (expected)
• 40-50 Exhibitors (expected)
• 6 Parallel Workshops
• 1 Industrial Forum to get an updated understanding of Graphene
  based technologies from worldwide industries
• 1 Brokerage event to foster technical cooperation in the field of Graphene

Regarding the GDR-I community, the GDR "Graphene and co" offers
13 grants to support the participation of PhD students by raising the
registration fees. Details are here.
In addition to 20 grants are offered by the Graphene2019 organization
to support travel expenses. Do not hesitate to apply !!

IC2N, Barcelona, May 8-9, 2019

In the series of the Lavoisier discussions organized by the GGR and GDR-I, a 2 days meeting on Quantum simulations in 2D materials will be held in IC2N (BellaTerra, Barcelona, Spain) on May 8-9, 2019.

All practical information is here.

The next Lavoisier discussion will be devoted to a special 2D material : hBN (hexagonal boron nitride).
It will be held, Nov. 8-9, 2018 in Montpellier. See more.

A 3 days Lavoisier discussion on the noncovalent functionalization of nanotubes with molecules will be organized in Paris, June 20-22, 2018.

All information here

Abstract submission is now open for the next “Journées de la Matière Condensée” in Grenoble. You are welcome to submit a contribution to the "2D Materials and their heterostructures" session organized with GDR Graphene & Co.

Dear Colleagues,

From 27 to 31 August, Grenoble holds the biennial conference, the “Journées de la Matière Condensée” (JMC), or Condensed Matter Days in english, organized by the Société Française de Physique: jmc2018.sciencesconf.org
This 16th edition will welcome more than 600 participants. There will be 10 plenary and 15 semi-plenary talks. However a large part of the program is dedicated to mini-colloquia (thematic sessions), which are an occasion to unit members of specific scientific communities.

Colloquium named "2D Materials and their heterostructures" is organized by GDR Graphene & Co represented by Emmanuel Baudin, Nedjma Bendiab, and Julien Renard (https://jmc2018.sciencesconf.org/data/pages/PMQ5_2D_Materials_and_their_Heterostructures_2.pdf). We invite you to submit an abstract on your research for an oral or a poster presentation.

DATE LIMIT: 15 April 2018

In the hope of seeing you at the next JMC in Grenoble.

Olivier Sandre (President of the Condensed Matter Division of the SFP)
Robert Whitney (President of the Grenoble organizing committee)
Laëtitia Marty (President of the Alps section of the SFP)

http://jmc2018.sciencesconf.org

A special issue of the "Journal of Raman Spectroscopy", edited by several members of the GDR (JL Sauvajol, R. Parret, M. Paillet) and P. Colomban (UPMC) is available online (free access) at :
http://onlinelibrary.wiley.com/doi/10.1002/jrs.v49.1/issuetoc

An international thematic school "Frontier research in 2D materials" will be organized in the CNRS center of Cargese, April 2-13, 2018. More here.

Application opening by mid-december 2017on this web site .

The next annual meeting of the GDR and GDR-I will be hosted in the CNRS resort center Paul Langevin in Aussois, in the French Alps. (15-19 October 2017)

More informations : Click here

A meeting, dedicated to the use of Single Wall Carbon Nanotubes in industrial applications will be organised on Tuesday April 4th 2017 at CNRS Meudon-Bellevue Campus, conveniently reachable ( 20mins) by train from Gare de Montparnasse (Paris, France).

Scope :

The scope of this meeting is to disseminate the results of the research activity performed within the EU/Japan funded IRENA project, Indium REplaced by Single Walled Carbon NAnotube Thin Films, briefly described in the attached flyer. The goal is to bring together academic researchers with engineers, and industrial decision makers already using, planning to use or simply interested in implementing Single Wall Carbon Nanotubes in their technologies and products. A number of leading European and Japanese companies already producing and selling Single Walled Carbon Nanotube based products have already announced their participation.

You are cordially invited to join this event. Should you be interested to participate, we simply ask you to contact us by e-mail. A program and registration form will be e-mailed within the next two weeks. Please forward this mail to any other members of your organization and colleagues who might be interested.
Contacts :

Dr Christophe Bichara (bichara@cinam.univ-mrs.fr; +33 6 62 92 28 73)
Dr Hakim Amara (hakim.amara@onera.fr; + 33 1 46 73 48 90)
Dr Annick Loiseau (annick.loiseau@onera.fr; + 33 1 46 73 44 53)

The 7th edition of Graphene Conference series, the largest European Event in Graphene and 2D Materials, will be organized in Barcelona (Spain) from the 28th until the 31st of March 2017. Over the past 6 editions, the Graphene Conference strengthened its position as the main meeting point of the Graphene community Worldwide.

http://www.grapheneconf.com/2017/index.php

Millie Dresselhaus died earlier on Monday 20th February at the Mount Auburn Hospital surrounded by her family and other people she loved. Her funeral will be arranged for this Wednesday at MIT (by Jewish tradition this must happen very soon).

We are indebted so much to her for all she has done in the field of graphite and related materials and how she has inspired researches worldwide with an amazing energy and vision during fifty years.

The plan at MIT is to celebrate Millie’s life at a larger gathering in the future. Memorial sessions will be organized at the next Graphene conference 2017 at Bercelona next March at the Conference NT17 in June at Belo Horizonte in Brazil.

The story on the MIT website provides some broad information, in addition to MIT-specific details

http://news.mit.edu/2017/institute-professor-emerita-mildred-dresselhaus-dies-86-0221

The coordinators of the GDR/GDR-I Graphene and co

The annual meeting 2018 of our research network will be held in Sète (on the Mediterranean seashore), oct. 15-19, 2018.
All information here

Welcome to the website of the annual meeting of the GDR-I GNT !
The conference will be held in « Village de Vacances la Vieille Perrotine », in Saint Pierre d’Oléron, France, from October 9 to October 13, 2016.

For more informations, please visit the website here