Semifluxon molecule under control
arXiv:0809.1346 · doi:10.1103/PhysRevLett.101.247001
Abstract
Josephson junctions with a phase drop pi in the ground state allow to create vortices of supercurrent carrying only half of the magnetic flux quantum Phi_0~2.07*10^-15 Wb. Such semifluxons have two-fold degenerate ground states denoted up (with flux +Phi_0/2 and supercurrent circulating clockwise) and down (with flux -Phi_0/2 and supercurrent circulating counterclockwise). We investigate a molecule consisting of two coupled semifluxons in a 0-pi-0 long Josephson junction. The fluxes (polarities) of semifluxons are measured by two on-chip SQUIDs. By varying the dc bias current applied to the 0-pi-0 junction, we demonstrate controllable manipulation and switching between two states, up-down and down-up, of a semifluxon molecule. These results provide a major step towards employing semifluxons as bits or qubits for classical and quantum digital electronics.
References in corpus (15)
- 0-pi Josephson tunnel junctions with ferromagnetic barrier
- Dynamics of semifluxons in Nb long Josephson 0-pi junctions
- Spontaneous Flux and Magnetic Interference Patterns in 0-pi Josephson Junctions
- Semi-fluxons in long Josephson 0-pi-junctions
- Ground state and bias current induced rearrangement of semifluxons in 0-pi long Josephson junctions
- Quantum tunneling of semifluxons
- Analytical analysis of ground states on 0- long Josephson junctions
- Anti-ferromagnetic ordering in arrays of superconducting pi-rings
- Vortices and Quantum tunneling in Current-Biased 0-π-0 Josephson Junctions of d-wave Superconductors
- Fluxon-semifluxon interaction in an annular long Josephson 0-pi-junction
- Ferromagnetic 0-pi Junctions as Classical Spins
- Spectroscopy of the fractional vortex eigenfrequency in a long Josephson 0-kappa junction
- Controllable plasma energy bands in a 1D crystal of fractional Josephson vortices
- Oscillatory eigenmodes and stability of one and two arbitrary fractional vortices in long Josephson 0-kappa-junctions
- Resonant flux motion and I-V -characteristics in frustrated Josephson junctions
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- Effective model for a short Josephson junction with a phase discontinuity
- Thermal escape of fractional vortices in long Josephson junctions
- Spectroscopy of a fractional Josephson vortex molecule
- Quantum tunneling of a single semifluxon in a 0-pi Josephson junction
- Existence and stability analysis of finite 0--0 Josephson junctions
- Delocalization of vortex magnetic field near a planar defect
- Effect of current injection into thin-film Josephson junctions
- A tunable macroscopic quantum system based on two fractional vortices
- Fractional vortex array realized at twin boundary in a nematic superconductor
- Fractional vortex in asymmetric 0- long Josephson junctions