Measuring current by counting electrons in a nanowire quantum dot

Abstract

We measure current by counting single electrons tunneling through an InAs nanowire quantum dot. The charge detector is realized by fabricating a quantum point contact in close vicinity to the nanowire. The results based on electron counting compare well to a direct measurements of the quantum dot current, when taking the finite bandwidth of the detector into account. The ability to detect single electrons also opens up possibilities for manipulating and detecting individual spins in nanowire quantum dots.

References in corpus (4)

• Single-shot read-out of an individual electron spin in a quantum dot
• Fast Single-Charge Sensing with an rf Quantum Point Contact
• Frequency-selective single photon detection using a double quantum dot
• A cryogenic amplifier for fast real-time detection of single-electron tunneling

Cited by in corpus (8)

• Electron counting in quantum dots
• Statistical electron excitation in a double quantum dot induced by two independent quantum point contacts
• Detecting THz current fluctuations in a quantum point contact using a nanowire quantum dot
• Detecting single-electron tunneling involving virtual processes in real time
• Time-resolved charge detection with cross-correlation techniques
• Correlated Counting of Single Electrons in a Nanowire Double Quantum Dot
• Real Time Electron Tunneling and Pulse Spectroscopy in Carbon Nanotube Quantum Dots
• Noise-induced spectral shift measured in a Double Quantum Dot