TOPOLOGICAL SPINTRONICS

Overview

Our team aims at manipulating spins currents in nanostructures, in particular in quantum materials with Dirac fermions, such as topological insulators or Weyl semimetals, or at oxide interfaces. Some important aspects of future spintronics devices, such as the efficient spin-charge interconversion at interfaces or the ballistic transport of spin states for quantum interconnects, are studied by magneto-transport measurements.

Research topics

Spin-Charge interconversion

Nanostructure made of a horizontal stripe of spin Hall effect material, with two vertical ferromagnetic electrodes to probe the spin accumulation or to inject spin currents. The nanostructure allows probing both the charge-to-spin (left) and spin-to-charge (right) conversions due to the spin-orbit coupling.

Control of magnetization

Nanostructure possessing NiFe nanowires, in which magnetic domain walls can propagate. When located at the vicinity of the Cu nanowire, the domain wall can be used to inject or detect pure spin currents.

Ballistic spin currents

The ballistic surface Dirac fermions in a 3D topological insulator propagate on the cristal faces of a quantum wire. The well-defined cross section gives flux-periodic Aharonov-Bohm oscillations of the resistance, due to quantum interference, for a magnetic induction applied parallel to the nanowire. The spin-helical surface modes offer new possibilities to build quantum spintronics devices of simple geometry, either for dissipationless long-range interconnects or local spin filtering controled by a magnetic field or an electrostatic gate. 

The team

Former members

Post-docs

  • Yu FU (2015-2016)
  • Juan Carlos ROJAS SANCHEZ (2010-2013)
  • Yu FU (2015-2016, 2018-2019)

PhDs

  • Andrei Mihai (2006-2009)
  • Van Dai Nguyen (2009-2012)
  • Piotr Laczkowski (2009-2012)
  • Williams Savero-Torres (2011-2014)
  • Pham Van Tuong (2014–2017)
  • Gilles Zhand (2014-2017)
  • Toshiki Gushi (2016-2019)
  • Paul Noël (2016-2019)
  • Aoyu Tan (2018-2021)
  • Valentin Labracherie (2017-2021)
  • Maxen Cosset-Cheneau (2019-2022)
  • Sambit Ghosh (2019-2022)

Internships

  • Williams Savero-Torres (2011)
  • Gilles Zahnd (2014)
  • Paul Noël (2016)
  • Maxen Cosset-Cheneau (2018)
  • Timothé Faivre (2009)
  • Hélène Durand (2005)
  • Andrei Mihai (2006)
  • Carl Naylor (2011)
  • Quentin Thiburce (2013)
  • Clément Nguyen (2013)
  • Sarah Ferry (2009)
  • Cédric Mannequin (2008)
  • Quentin Riffard (2010)
  • Willy Lim (2016)
  • Matthieu Praquin (2018)
  • Marie-Paule Okinda (2020)

Visitors

  • Sara Varotto (2019-2020)

Projects

  • ANR Contrabass (2020-2023)
  • ITN H2020 Spears (2021-2024)
  • ANR Oiso (2017-2021)
  • ISP Idex UGA DOMINO (2018-2021)
  • FET Proactive H2020 Tocha (2019-2023)
  • IRS Idex UGA (2017-2020)

Partners

  • Tsukuba University (Japan)
  • Unité mixte de Physique CNRS/Thalès (Orsay)
  • Néel Institute (Grenoble)
  • Leti (Grenoble)
  • Institut Jean Lamour (Nancy)
  • Leibniz Institute IFW (Dresden)
  • Technical University (Dresden)

Recent news

  • Seminar – Topological spintronics (November 20th, 2018)Seminar - Topological spintronics
    On november 28, We have the pleasure to welcome Bertrand Dupé from INSPIRE Group, Institute of Physics, Johannes Gutenberg University Mainz, Germany. He will give us a seminar at 11:00, CEA/Spintec, Bat. 1005, room 434A ...
  • TOCHA – A FETPROACTIVE project at SPINTEC (October 30th, 2018)TOCHA - A FETPROACTIVE project at SPINTEC
    Tocha for Dissipationless topological channels for information transfer and quantum metrology, is a Research and Innovation Action FETPROACTIVE project funded by the European Commission. The goal of TOCHA, a five years project head by Sergio ...
  • IFW – SPINTEC collaborative workshop (October 14th, 2018)IFW - SPINTEC collaborative workshop
    SPINTEC laboratory and IFW-Dresden have agreed to strengthen their ties through an international collaborative agreement. This takes the so-called form of an International Associated Lab (LIA), supported by both CNRS and the Leibniz Society. Although ...
  • Masters thesis projects for Spring 2019 (October 10th, 2018)Masters thesis projects for Spring 2019
    You find here the list of proposals for Master-2 internships to take place during Spring 2019. In most cases, these internships are intended to be suitable for a longer-term PhD work. Interested Master-1 students are ...
  • Highly Efficient Spin-to-Charge Current Conversion in Strained HgTe Surface States Protected by a HgCdTe Layer (October 03rd, 2018)Highly Efficient Spin-to-Charge Current Conversion in Strained HgTe Surface States Protected by a HgCdTe Layer
    We report the observation of spin-to-charge current conversion in strained mercury telluride at room temperature, using spin pumping experiments. We show that a HgCdTe barrier can be used to protect the HgTe from direct contact ...

Publications


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