A5004772968- Graphene research and applications
- Quantum and electron transport phenomena
- Surface and Thin Film Phenomena
- Topological Materials and Phenomena
- Photonic Crystals and Applications
- Physics of Superconductivity and Magnetism
- Electron and X-Ray Spectroscopy Techniques
- Photonic and Optical Devices
- Molecular Junctions and Nanostructures
- Advancements in Semiconductor Devices and Circuit Design
- Advanced Materials Characterization Techniques
- 2D Materials and Applications
- Quantum Information and Cryptography
- Graphene and Nanomaterials Applications
- Carbon and Quantum Dots Applications
- Spectroscopy and Quantum Chemical Studies
- Quantum Dots Synthesis And Properties
- Photorefractive and Nonlinear Optics
- Mechanical and Optical Resonators
- Diamond and Carbon-based Materials Research
- Quantum optics and atomic interactions
- Semiconductor Lasers and Optical Devices
ETH Zurich
2024-2025
Université Paris-Saclay
2019-2021
Centre de Nanosciences et de Nanotechnologies
2019-2021
Centre National de la Recherche Scientifique
2019-2021
NTT Basic Research Laboratories
2015
Van der Waals heterostructures provide a versatile platform for tailoring electronic properties through the integration of two-dimensional materials. Among these combinations, interaction between bilayer graphene and transition metal dichalcogenides (TMDs) stands out due to its potential inducing spin-orbit coupling (SOC) in graphene. Future devices concepts require understanding precise nature SOC TMD/bilayer influence on transport phenomena. Here, we experimentally confirm presence two...
We observe and comprehend the dynamical Coulomb blockade suppression of electrical conductance across an electronic quantum channel subjected to a temperature difference. A broadly tunable, spin-polarized Ga(Al)As is connected on-chip, through micron-scale metallic node, linear RC circuit. The latter made up node's geometrical capacitance C in parallel with adjustable resistance R∈{1/2,1/3,1/4}×h/e2 formed by 2–4 Hall channels. system characterized three temperatures: Temperatures electrons...
Current semiconductor qubits rely either on the spin or charge degree of freedom to encode quantum information. By contrast, in bilayer graphene valley freedom, stemming from crystal lattice symmetry, is a robust number that can therefore be harnessed for this purpose. The simplest implementation qubit would two states with opposite valleys as case single-carrier dot immersed small perpendicular magnetic field (B⊥ ≲ 100 mT). However, excited spectrum has not been resolved date relevant...
The intrinsic valley degree of freedom makes bilayer graphene a unique platform for emerging types semiconducting qubits. single-carrier quantum dot ground state exhibits two-fold degeneracy where the two states have opposite spin and numbers. By breaking time-reversal symmetry this with an out-of-plane magnetic field, novel type qubit (Kramers qubit), encoded in two-dimensional spin-valley subspace, becomes accessible. Kramers is robust against known spin- valley-mixing mechanisms, as it...
The Coulomb interaction generally limits the quantum propagation of electrons. However, it can also provide a mechanism to transfer their state over larger distances. Here, we demonstrate such form teleportation, across metallic island within which electrons are trapped much longer than lifetime. This effect originates from low temperature freezing island's charge $Q$ which, in presence single connected electronic channel, enforces one-to-one correspondence between incoming and outgoing Such...
The quantum coherence of electronic quasiparticles underpins many the emerging transport properties conductors at small scales. Novel implementations optics devices are now available with perspectives such as 'flying' qubit manipulations. However, interferences in remained up to limited propagation paths shorter than $30\,\mu$m, independently material. Here we demonstrate strong after a along two $0.1\,$mm long pathways circuit. Interferences visibility high $80\%$ and $40\%$ observed on...
Abstract When assembling individual quantum components into a mesoscopic circuit, the interplay between Coulomb interaction and charge granularity breaks down classical laws of electrical impedance composition. Here we explore experimentally thermal consequences, observe an additional mechanism electronic heat transport. The investigated, broadly tunable test-bed circuit is composed micron-scale metallic node connected to one channel resistance. Heating up with Joule dissipation, separately...
Few-cell point-defect photonic crystal (PhC) nanocavities (such as LX and H1 type cavities), have several unique characteristics including an ultra-small mode volume (Vm), a small device footprint advantageous for dense integration, large spacing high spontaneous-emission coupling coefficient (β), which are promising energy-efficient densely-integratable on-chip laser light sources enhanced by the cavity QED effect. To achieve this goal, quality factor (Q) is essential, but conventional...
Van der Waals heterostructures provide a versatile platform for tailoring electronic properties through the integration of two-dimensional materials. Among these combinations, interaction between bilayer graphene and transition metal dichalcogenides (TMDs) stands out due to its potential inducing spin-orbit coupling (SOC) in graphene. Future devices concepts require understanding precise nature SOC TMD/bilayer influence on transport phenomena. Here, we experimentally confirm presence two...
We measure the entropy change of charge transitions in an electrostatically defined quantum dot bilayer graphene. Entropy provides insights into equilibrium thermodynamic properties both ground and excited states beyond transport measurements. For one-carrier regime, obtained shows that state has a two-fold degeneracy lifted by out-of-plane magnetic field. This observation is agreement with previous direct measurements confirms applicability this novel method. two-carrier extracted indicates...
We measured the spectrum of a single-carrier bilayer graphene quantum dot as function both parallel and perpendicular magnetic fields, using time-resolved charge detection technique that gives access to individual tunnel events. Thanks our unprecedented energy resolution 4$\mu~$eV, we could distinguish all four levels dot's first orbital, in particular range fields where second excited states cross ($B_\perp\lesssim 100~$mT). thereby experimentally establish, hitherto extrapolated,...
We implement circuit quantum electrodynamics (cQED) with dots in bilayer graphene, a maturing material platform that can host long-lived spin and valley states. Our device combines high-impedance (Zr ≈ 1 kΩ) superconducting microwave resonator double dot electrostatically defined graphene-based van der Waals heterostructure. Electric dipole coupling between the subsystems allows to sense electric susceptibility of from which we reconstruct its charge stability diagram. achieve sensitive fast...
Systematic multi-hole tuning of H0 nanocavity with theoretical Q ∼107 is reported that outperforms L3 and other a-few-missing-hole nanocavities over a wide slab-thickness range. Experimental ∼106 achieved.
We implement circuit quantum electrodynamics (cQED) with dots in bilayer graphene, a maturing material platform for semiconductor qubits that can host long-lived spin and valley states. The presented device combines high-impedance ($Z_\mathrm{r} \approx 1 \mathrm{k{\Omega}}$) superconducting microwave resonator double dot electrostatically defined graphene-based van der Waals heterostructure. Electric dipole coupling between the subsystems allows to sense electric susceptibility of from...