Zobrazeno 1 - 10
of 60
pro vyhledávání: '"Zazunov, Alex"'
Publikováno v:
Physical Review B 109, 214505 (2024)
We provide a theoretical framework to describe the quantum many-body dynamics of Andreev states in Josephson junctions with spin-orbit coupling and a magnetic Zeeman field. In such cases, employing a doubled Nambu spinor description is technically ad
Externí odkaz:
http://arxiv.org/abs/2404.05485
We propose active steering protocols for quantum state preparation in quantum circuits where each system qubit is connected to a single detector qubit, employing a simple coupling selected from a small set of steering operators. The decision is made
Externí odkaz:
http://arxiv.org/abs/2308.00384
Publikováno v:
Phys. Rev. B 107, 214515 (2023)
Excess quasiparticles play a crucial role in superconducting quantum devices ranging from qubits to quantum sensors. In this work we analyze their dynamics for phase-biased finite-length weak links with several Andreev subgap states, where the coupli
Externí odkaz:
http://arxiv.org/abs/2207.05782
Publikováno v:
Phys. Rev. B 92, 085422 (2015)
We consider a waveguide formed in a clean graphene monolayer by a spatially inhomogeneous magnetic field. The single-particle dispersion relation for this waveguide exhibits a zero-energy Landau-like flat band, while finite-energy bands have dispersi
Externí odkaz:
http://arxiv.org/abs/1506.05362
Publikováno v:
Phys. Rev. X 4, 031033 (2014)
We study the ground state of $N$ weakly interacting electrons (with $N\le 10$) in a two-dimensional parabolic quantum dot with strong Rashba spin-orbit coupling. Using dimensionless parameters for the Coulomb interaction, $\lambda\lesssim 1$, and the
Externí odkaz:
http://arxiv.org/abs/1405.2675
Publikováno v:
Phys. Rev. Lett. 113, 076404 (2014)
We propose and study a setup realizing a stable manifold of non-Fermi liquid states. The device consists of a mesoscopic superconducting island hosting $N \ge 3$ Majorana bound states tunnel-coupled to normal leads, with a Josephson contact to a bulk
Externí odkaz:
http://arxiv.org/abs/1404.5499
Publikováno v:
Physical Review B 80 (2008) 184510
We consider a Hamiltonian model for a quantum dot which is placed between two superconducting leads with a constant bias imposed between these leads. Using the non-equilibrium Keldysh technique, we focus on the subgap current, where it is known that
Externí odkaz:
http://arxiv.org/abs/0908.1018
Publikováno v:
Phys. Rev. B 79, 184517 (2009)
We compute the critical Josephson current through a single-molecule junction. As a model for a molecule with a bistable conformational degree of freedom, we study an interacting single-level quantum dot coupled to a two-level system and weakly connec
Externí odkaz:
http://arxiv.org/abs/0903.2007
Publikováno v:
Physical Review B 78 (2008) 184503
We have observed Rabi-like oscillations in a current-biased dc SQUID presenting enhanced coherence times compared to our previous realization \cite{Claudon_PRL04}. This Josephson device behaves as an anharmonic oscillator which can be driven into a c
Externí odkaz:
http://arxiv.org/abs/0709.3787
Autor:
Zazunov, Alex, Martin, Thierry
We consider resonant transport through a molecular quantum dot coupled to a local vibration mode. Applying the non-equilibrium Green function technique in the polaron representation, we develop a non-perturbative scheme to calculate the electron spec
Externí odkaz:
http://arxiv.org/abs/cond-mat/0703626