A5049478053- Quantum and electron transport phenomena
- Physics of Superconductivity and Magnetism
- Surface and Thin Film Phenomena
- Graphene research and applications
- Topological Materials and Phenomena
- COVID-19 diagnosis using AI
- Magnetic properties of thin films
- Quantum Information and Cryptography
- Chalcogenide Semiconductor Thin Films
- Theoretical and Computational Physics
- Inorganic Fluorides and Related Compounds
- nanoparticles nucleation surface interactions
- Iron-based superconductors research
- Mechanical and Optical Resonators
- Advanced Semiconductor Detectors and Materials
- Semiconductor Quantum Structures and Devices
- Advanced Thermoelectric Materials and Devices
- Advancements in Semiconductor Devices and Circuit Design
- Radiomics and Machine Learning in Medical Imaging
University of California, Santa Barbara
2024
CEA Paris-Saclay
2021-2023
Université Paris-Saclay
2021-2023
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
2021-2023
Centre National de la Recherche Scientifique
2018-2023
CEA Paris-Saclay - Etablissement de Saclay
2022
ESPCI Paris
2017-2019
Sorbonne Université
2017-2019
Université Paris Cité
2017-2019
Université Paris Sciences et Lettres
2017-2019
Bernal bilayer graphene hosts even-denominator fractional quantum Hall states thought to be described by a Pfaffian wave function with non-Abelian quasiparticle excitations. Here, we report the quantitative determination of energy gaps in using both thermally activated transport and direct measurement chemical potential. We find activation gap 5.1 K at B=12 T for half filled N=1 Landau level, consistent density matrix renormalization group calculations state. However, measured thermodynamic...
The transmission of Cooper pairs between two weakly coupled superconductors produces a superfluid current and phase difference; the celebrated Josephson effect. Because time-reversal parity symmetries, there is no without difference superconductors. Reciprocally, when those symmetries are broken, an anomalous supercurrent can exist in absence bias or, equivalently, shift $\varphi_0$ current. We report on observation hybrid junctions fabricated with topological insulator Bi$_2$Se$_3$...
Graphene is a very promising test-bed for the field of electron quantum optics. However, fully tunable and coherent electronic beam splitter still missing. We report demonstration splitters in graphene that couple Hall edge channels having opposite valley polarizations. The transmission our can be tuned from zero to near unity. By independently setting at two corners PN junction intermediate transmissions, we realize Mach-Zehnder interferometer. This tunability allows us unambiguously...
Flying qubits encode quantum information in propagating modes instead of stationary discrete states. Although photonic flying are available, the weak interaction between photons limits efficiency conditional gates. Conversely, electronic can use Coulomb interactions, but weaker coherence conventional semiconductors has hindered their realization. In this work, we engineered on-demand injection a single qubit state and its manipulation over Bloch sphere. The is Leviton Hall edge channels...
How small superconductors can be? For isolated nanoparticles subject to quantum size effects, P.W. Anderson conjectured in 1959 that superconductivity could only exist when the electronic level spacing $\delta$ is smaller than superconducting gap energy $\Delta$. Here, we report a scanning tunneling spectroscopy study of lead (Pb) nanocrystals grown on (110) surface InAs. We find for lateral Fermi wavelength 2D electron gas at InAs, transmission interface weak; this leads Coulomb blockade...
Over the past 20 years, many efforts have been made to understand and control decoherence in 2D electron systems. In particular, several types of electronic interferometers considered GaAs heterostructures, order protect interfering electrons from decoherence. Nevertheless, it is now understood that intrinsic sources fundamentally limit more advanced quantum manipulations. Here, we show graphene offers a unique possibility reach regime where frozen study unexplored regimes interferometry. We...
We present a study of Andreev Quantum Dots (QDots) fabricated with small-diameter (30 nm) Si-doped InAs nanowires where the Fermi level can be tuned across mobility edge separating localized states from delocalized states. The transition to insulating phase is identified by drop in amplitude and width excited levels found have remarkable consequences on spectrum superconducting SubGap Resonances (SGRs). While at deeply levels, only quasiparticles co-tunneling observed, for slightly Shiba...
We investigate the potential use of colloidal nanoplates Sb2Te3 by conducting transport on single particle with in mind their as 3D topological insulator material. develop a synthetic procedure for growth plates large lateral extension and probe infrared optical properties. These two properties are used determination bulk carrier density agree value 2-3 × 1019 cm-3 range. Such is compatible metallic side Mott criterion which also confirmed weak thermal dependence conductance. By...
In the recent work of Ref.\cite{Vlaic2017-bs}, it has been shown that Pb nanocrystals grown on electron accumulation layer at (110) surface InAs are in regime Coulomb blockade. This enabled first scanning tunneling spectroscopy study superconducting parity effect across Anderson limit. The nature tunnel barrier between and substrate attributed to a quantum constriction electronic wave-function interface due large Fermi wavelength InAs. this manuscript, we detail review arguments leading...
Bernal bilayer graphene hosts even denominator fractional quantum Hall states thought to be described by a Pfaffian wave function with nonabelian quasiparticle excitations. Here we report the quantitative determination of energy gaps in using both thermally activated transport and direct measurement chemical potential. We find activation gap 5.1K at B = 12T for half-filled N=1 Landau level, consistent density matrix renormalization group calculations state. However, measured thermodynamic...