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Q-NET young researchers

Laboratory for Solid State Physics, ETH Zurich, Zurich, Switzerland
Female, French



de Master in Micro and Nanosystems, ETH Zurich, Zurich, Switzerland
deGraduate engineering program "Supaéro", ISAE : Institut Supérieur de l'Aéronautique et de l'Espace, Toulouse, France

Field of research
Graphene nanostructures (fabrication & measurements)

Research experience
hjg Master thesis at ETH Zurich: Multi-level transport in a three terminal graphene quantum dot, Nanophysics group (K. Ensslin), Laboratory for Solid State Physics, ETH Zurich (Feb-Aug 2011)

hjg Semester thesis at ETH Zurich: Geometry-induced electrostatic trapping of nanoparticles: residence time counting and modelling, Nano-optics group (V. Sandoghdar), Laboratory for Physical Chemistry, ETH Zurich (Feb-June 2010)

hjg Research project (internship): Analysis of DNA melting dynamics by Tethered Particle Motion, FDBM-DNA group (L. Salomé), Laboratory for Structural Biology and Biophysics, IPBS, Toulouse, France (Sep-June 2009)

hjg Research project at ISAE: Conception of a molecular vehicle, Nanoscience group (C. Joachim), Center for Materials Elaboration and Structural Studies (CEMES, CNRS), Toulouse, France (Feb-June 2008)

Thesis Project : Title, Summary
Electronic transport in graphene nanostructures

Graphene quantum dots are promising candidates for fabricating spin qubits [1]. This is due to the fact that the spin coherence time is expected to be long in this material, since both spin-orbit coupling and hyperfine interaction are expected to be low.
In this respect, we aim at realizing high quality graphene quantum dots. Disorder in exfoliated graphene is mainly due to the environment (substrate and adsorbates). As suspended nanostructures are mechanically unstable, an atomically flat and charge-trap-free substrate such as hexagonal boron nitride [2] is needed to fabricate clean graphene devices by exfoliation.
Secondly, we aim at a better control of the quantum dots. In particular, access to the excitation spectrum of these charged islands and to the few electron regime is necessary for controlled spin manipulation [3].
High frequency gate voltage pulsing will be used for spin read out experiments (such as in [4]). In double dot systems, phenomena like the Pauli spin blockade, which can be used for the characterization of a spin qubit, will be investigated.

List of Publications
[Jacobsen] “Transport in a three-terminal graphene quantum dot in the multi-level regime“, A. Jacobsen, P. Simonet, K. Ensslin and T. Ihn, N. J. Phys. 14, 023052 (2012), Task 4.2

Transport in a three-terminal graphene quantum dot in the multi-level regime, A. Jacobsen, P. Simonet, K. Ensslin, and T. Ihn, New Journal of Physics  14, 023052 (2012).

Electronic triple-dot transport through a bilayer graphene island with ultrasmall constrictions, D. Bischoff, A. Varlet, P. Simonet, T. Ihn and K. Ensslin, New Journal of Physics  15, 83029 (2013).

Finite-bias spectroscopy of a three-terminal graphene quantum dot in the multilevel regime, A. Jacobsen, P. Simonet, K. Ensslin, and T. Ihn, Physical Review B  89, 165413 (2014).

Anomalous sequence of quantum Hall liquids revealing tunable Lifshitz transition in bilayer graphene, A. Varlet, D. Bischoff, P. Simonet, K. Watanabe, T. Taniguchi, T. Ihn, K. Ensslin, M. Mucha-Kruczynski, and V. I. Fal'ko, Physical Review Letters 113, 116602 (2014).

Localized charge carriers in graphene nanodevices, D. Bischoff, A. Varlet, P. Simonet, M. Eich, H. C. Overweg, T. Ihn, K. Ensslin, Applied Physics Review 2, 031301 (2015).

Capacitive coupling in hybrid graphene/GaAs nanostructures, P. Simonet, C. Roessler, T. Kraehenmann, A. Varlet, T. Ihn, K. Ensslin, C. Reichl, W. Wegscheider, Applied Physics Letters 107, 023105 2015).

“Measuring the local quantum capacitance of graphene using a strongly coupled graphene nanoribbon”, D. Bischoff, M. Eich, A. Varlet, P. Simonet, T. Ihn, K. Ensslin, Physical Review B 91, 115441 (2015).

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