Network


Latest external collaboration on country level. Dive into details by clicking on the dots.

Hotspot


Dive into the research topics where Sophie Charpentier is active.

Publication


Featured researches published by Sophie Charpentier.


Nano Letters | 2015

Room Temperature Electrical Detection of Spin Polarized Currents in Topological Insulators

André Dankert; Johannes Geurs; M. Venkata Kamalakar; Sophie Charpentier; Saroj Prasad Dash

Topological insulators (TIs) are a new class of quantum materials that exhibit a current-induced spin polarization due to spin-momentum locking of massless Dirac Fermions in their surface states. This helical spin polarization in three-dimensional (3D) TIs has been observed using photoemission spectroscopy up to room temperatures. Recently, spin polarized surface currents in 3D TIs were detected electrically by potentiometric measurements using ferromagnetic detector contacts. However, these electric measurements are so far limited to cryogenic temperatures. Here we report the room temperature electrical detection of the spin polarization on the surface of Bi2Se3 by employing spin sensitive ferromagnetic tunnel contacts. The current-induced spin polarization on the Bi2Se3 surface is probed by measuring the magnetoresistance while switching the magnetization direction of the ferromagnetic detector. A spin resistance of up to 70 mΩ is measured at room temperature, which increases linearly with current bias, reverses sign with current direction, and decreases with higher TI thickness. The magnitude of the spin signal, its sign, and control experiments, using different measurement geometries and interface conditions, rule out other known physical effects. These findings provide further information about the electrical detection of current-induced spin polarizations in 3D TIs at ambient temperatures and could lead to innovative spin-based technologies.


Nano Letters | 2013

Express Optical Analysis of Epitaxial Graphene on SiC: Impact of Morphology on Quantum Transport

Tom Yager; Arseniy Lartsev; Sumedh Mahashabde; Sophie Charpentier; Dejan Davidovikj; Andrey Danilov; Rositza Yakimova; Vishal Panchal; Olga Kazakova; Alexander Tzalenchuk; Samuel Lara-Avila; Sergey Kubatkin

We show that inspection with an optical microscope allows surprisingly simple and accurate identification of single and multilayer graphene domains in epitaxial graphene on silicon carbide (SiC/G) and is informative about nanoscopic details of the SiC topography, making it ideal for rapid and noninvasive quality control of as-grown SiC/G. As an illustration of the power of the method, we apply it to demonstrate the correlations between graphene morphology and its electronic properties by quantum magneto-transport.


Physical Review B | 2014

Influence of topological edge states on the properties of Al/Bi2Se3/Al hybrid Josephson devices

Luca Galletti; Sophie Charpentier; M. Iavarone; P. Lucignano; D. Massarotti; Riccardo Arpaia; Yusuke Suzuki; Kazuo Kadowaki; Thilo Bauch; A. Tagliacozzo; F. Tafuri; Floriana Lombardi

In superconductor-topological insulator-superconductor hybrid junctions, the barrier edge states are expected to be protected against backscattering, to generate unconventional proximity effects, and, possibly, to signal the presence of Majorana fermions. The standards of proximity modes for these types of structures have to be settled for a neat identification of possible new entities. Through a systematic and complete set of measurements of the Josephson properties we find evidence of ballistic transport in coplanar Al-Bi2Se3-Al junctions that we attribute to a coherent transport through the topological edge state. The shunting effect of the bulk only influences the normal transport. This behavior, which can be considered to some extent universal, is fairly independent of the specific features of superconducting electrodes. A comparative study of Shubnikov-de Haas oscillations and scanning tunneling spectroscopy gave an experimental signature compatible with a two-dimensional electron transport channel with a Dirac dispersion relation. A reduction of the size of the Bi2Se3 flakes to the nanoscale is an unavoidable step to drive Josephson junctions in the proper regime to detect possible distinctive features of Majorana fermions.


Applied Physics Letters | 2014

Ultra low noise YBa2Cu3O7−δ nano superconducting quantum interference devices implementing nanowires

Riccardo Arpaia; Marco Arzeo; Shahid Nawaz; Sophie Charpentier; Floriana Lombardi; Thilo Bauch

We present results on ultra low noise YBa


Applied Physics Express | 2014

Phase transition of bismuth telluride thin films grown by MBE

Attila Fülöp; Yuxin Song; Sophie Charpentier; Peixiong Shi; Maria Ekström; Luca Galletti; Riccardo Arpaia; Thilo Bauch; Floriana Lombardi; Shumin Wang

_2


Physical Review B | 2016

Incipient Berezinskii-Kosterlitz-Thouless transition in two-dimensional coplanar Josephson junctions

D. Massarotti; B. Jouault; V. Rouco; Sophie Charpentier; Thilo Bauch; A. Michon; A. de Candia; P. Lucignano; Floriana Lombardi; Francesco Tafuri; A. Tagliacozzo

Cu


IEEE Transactions on Applied Superconductivity | 2017

High-Transparency Al/Bi 2 Te 3 Double-Barrier Heterostructures

Luca Galletti; Sophie Charpentier; Yuxin Song; Dmitry Golubev; Shu M. Wang; Thilo Bauch; Floriana Lombardi

_3


Physical Review B | 2018

Origin and evolution of surface spin current in topological insulators

André Dankert; Priyamvada Bhaskar; Dmitrii Khokhriakov; Isabel Harrysson Rodrigues; Bogdan Karpiak; Venkata Kamalakar Mutta; Sophie Charpentier; Ion Garate; Saroj Prasad Dash

O


Scientific Reports | 2017

The electron-phonon interaction at deep Bi 2 Te3-semiconductor interfaces from Brillouin light scattering

Maciej Wiesner; A. Trzaskowska; B. Mroz; Sophie Charpentier; Supen Wang; Yuxin Song; Floriana Lombardi; P. Lucignano; G. Benedek; Davide Campi; Marco Bernasconi; F. Guinea; A. Tagliacozzo

_{7-\delta}


arXiv: Superconductivity | 2014

Ultra low noise YBCO nanoSQUIDs implementing nanowires

Riccardo Arpaia; Marco Arzeo; Shahid Nawaz; Sophie Charpentier; Floriana Lombardi; Thilo Bauch

nano Superconducting QUantum Interference Devices (nanoSQUIDs). To realize such devices, we implemented high quality YBCO nanowires, working as weak links between two electrodes. We observe critical current modulation as a function of an externally applied magnetic field in the full temperature range below the transition temperature

Collaboration


Dive into the Sophie Charpentier's collaboration.

Top Co-Authors

Avatar

Floriana Lombardi

Chalmers University of Technology

View shared research outputs
Top Co-Authors

Avatar

Thilo Bauch

Chalmers University of Technology

View shared research outputs
Top Co-Authors

Avatar

Riccardo Arpaia

Chalmers University of Technology

View shared research outputs
Top Co-Authors

Avatar

Luca Galletti

Chalmers University of Technology

View shared research outputs
Top Co-Authors

Avatar

Shumin Wang

Chinese Academy of Sciences

View shared research outputs
Top Co-Authors

Avatar

Yuxin Song

Chinese Academy of Sciences

View shared research outputs
Top Co-Authors

Avatar

Reza Baghdadi

Chalmers University of Technology

View shared research outputs
Top Co-Authors

Avatar

P. Lucignano

International School for Advanced Studies

View shared research outputs
Top Co-Authors

Avatar
Top Co-Authors

Avatar
Researchain Logo
Decentralizing Knowledge