Josephson diode effect via a non-equilibrium Rashba system
arXiv:2501.05671 · doi:10.1103/nt1m-5sff
Abstract
A non-equilibrium state in a Rashba system under an in-plane magnetic field is identified as the origin of the Josephson diode effect. This state is induced by a current bias--necessary for measuring the current-voltage characteristics--which shifts the Fermi momentum away from equilibrium. This essential mechanism has been overlooked in previous studies. This oversight stems from the implicit assumption that the equilibrium-based formulations are sufficient to describe Josephson effect. We formulate the Josephson coupling via the non-equilibrium Rashba system under current bias using a tunneling Hamiltonian, where the Rashba system is modeled as one-dimensional. When the magnetic field is applied perpendicular to the current, the Josephson coupling becomes asymmetric, giving rise to the diode effect. The magnitude and sign of this effect depend on the distance between the superconducting electrodes , the in-plane magnetic field, and the spin-orbit coupling strength. Our results clarify the microscopic origin of the Josephson diode effect, which can be optimized by tuning .
10 pages, 9 figures
References in corpus (25)
- Giant Spin-splitting in the Bi/Ag(111) Surface Alloy
- Tunable Supercurrent Through Semiconductor Nanowires
- Realization of the field-free Josephson Diode
- A Josephson junction supercurrent diode
- Direct coupling between magnetism and superconducting current in Josephson Phi junction
- Anomalous Josephson effect induced by spin-orbit interaction and Zeeman effect in semiconductor nanowires
- Universal Josephson diode effect
- Anomalous Josephson Current in Junctions with Spin-Polarizing Quantum Point Contacts
- The Josephson diode effect in supercurrent interferometers
- General theory of Josephson Diodes
- Theory of diode effect in d-wave superconductor junctions on the surface of topological insulator
- Josephson Diode Effect Induced by Valley Polarization in Twisted Bilayer Graphene
- Spin-orbit induced chirality of Andreev states in Josephson junctions
- Tunable Josephson diode effect on the surface of topological insulators
- Enhancing the Josephson diode effect with Majorana bound states
- Gate-tunable Josephson diode effect in Rashba spin-orbit coupled quantum dot junctions
- Field-Effect Josephson Diode via Asymmetric Spin-Momentum-Locking States
- Supercurrent rectification with time-reversal symmetry broken multiband superconductors
- Superconducting diode effect in diffusive superconductors and Josephson junctions with Rashba spin-orbit coupling
- Anomalous supercurrent and diode effect in locally perturbed topological Josephson junctions
- Role of magnetic scattering in 0-pi transitions in a superconductor/ferromagnetic metal/superconductor junction
- Field-free Josephson diode effect in interacting chiral quantum dot junctions
- Optimizing one dimensional superconducting diodes: Interplay of Rashba spin-orbit coupling and magnetic fields
- Josephson diode effect in one-dimensional quantum wires connected to superconductors with mixed singlet-triplet pairing
- Josephson diode effect in junctions of superconductors with band asymmetric metals