Experimental determination of the elastic cotunneling rate in a hybrid single-electron box

Abstract

We report measurements of charge configurations and charge transfer dynamics in a hybrid single-electron box composed of aluminum and copper. We used two single-electron transistors (SETs) to simultaneously read out different parts of the box, enabling us to map out stability diagrams of the box and identify various charge transfer processes in the box. We further characterized the elastic cotunneling in the box, which is an important source of error in electron turnstiles consisting of hybrid SETs, and found that the rate was as low as 1 Hz at degeneracy and compatible with theoretical estimates for electron tunneling via virtual states in the central superconducting island of the box.

References in corpus (12)

• Opportunities for mesoscopics in thermometry and refrigeration: Physics and applications
• Single-electron current sources: towards a refined definition of ampere
• Hybrid single-electron transistor as a source of quantized electric current
• Near-unity Cooper pair splitting efficiency
• Photon assisted tunneling as an origin of the Dynes density of states
• Nonlocal entanglement in hybrid superconducting and normal-metal three terminal devices
• Vanishing quasiparticle density in a hybrid Al/Cu/Al single-electron transistor
• Non-adiabadic charge pumping in a hybrid SET transistor
• Dynamical Coulomb blockade and spin-entangled electrons
• Experimental investigation of hybrid single-electron turnstiles with high charging energy
• Quantized current of a hybrid single-electron transistor with superconducting leads and a normal-metal island
• Environmentally Activated Tunneling Events in a Hybrid Single-Electron Box