Emergence of a negative charging energy in a metallic dot capacitively coupled to a superconducting island
arXiv:cond-mat/0703412 · doi:10.1103/PhysRevB.77.054517
Abstract
We consider the hybrid setup formed by a metallic dot, capacitively coupled to a superconducting island S connected to a bulk superconductor by a Josephson junction. Charge fluctuations in S act as a dynamical gate and overscreen the electronic repulsion in the metallic dot, producing an attractive interaction between two additional electrons. As the offset charge of the metallic dot is increased, the dot charging curve shows positive steps () followed by negative ones () signaling the occurrence of a negative differential capacitance. A proposal for experimental detection is given, and potential applications in nanoelectronics are mentioned.
arXiv commentRevised version, 4 pages, 4 figures
References in corpus (15)
- Electron transport through double quantum dots
- Coherent manipulation of electronic states in a double quantum dot
- Single-shot readout of electron spin states in a quantum dot using spin-dependent tunnel rates
- Quantum Dot as Spin Filter and Spin Memory
- Differential Charge Sensing and Charge Delocalization in a Tunable Double Quantum Dot
- Variable electrostatic transformer: controllable coupling of two charge qubits
- Many Body Effects on the Transport Properties of Single-Molecule Devices
- Tunable Noise Cross-Correlations in a Double Quantum Dot
- Pair tunneling through single molecules
- Bi-stable tunneling current through a molecular quantum dot
- Spin current shot noise as a probe of interactions in mesoscopic systems
- Nonequilibrium charge-Kondo transport through negative-U molecules
- Pair Tunneling in Semiconductor Quantum Dots
- Tunable coupling of qubits: nonadiabatic corrections
- Pair Tunneling and shot noise through a single molecule in a strong electron-phonon coupling