Detecting single-electron tunneling involving virtual processes in real time

Abstract

We use time-resolved charge detection techniques to probe virtual tunneling processes in a double quantum dot. The process involves an energetically forbidden state separated by an energy $\delta$ from the Fermi energy in the leads. The non-zero tunneling probability can be interpreted as cotunneling, which occurs as a direct consequence of time-energy uncertainty. For small energy separation the electrons in the quantum dots delocalize and form molecular states. In this regime we establish the experimental equivalence between cotunneling and sequential tunneling into molecular states for electron transport in a double quantum dot. Finally, we investigate inelastic cotunneling processes involving excited states of the quantum dots. Using the time-resolved charge detection techniques, we are able to extract the shot noise of the current in the cotunneling regime.

References in corpus (25)

• Electron transport through double quantum dots
• Single-shot read-out of an individual electron spin in a quantum dot
• Coherent manipulation of electronic states in a double quantum dot
• Counting statistics of single-electron transport in a quantum dot
• Manipulation of a single charge in a double quantum dot
• Allowed and forbidden transitions in artificial hydrogen and helium atoms
• Electron Cotunneling in a Semiconductor Quantum Dot
• Differential Charge Sensing and Charge Delocalization in a Tunable Double Quantum Dot
• Real-time detection of single electron tunneling using a quantum point contact
• Frequency-selective single photon detection using a double quantum dot
• Cotunneling Spectroscopy in Few-Electron Quantum Dots
• Time-Resolved Detection of Individual Electrons in a Quantum Dot
• Transport through a double quantum dot in the sequential- and co- tunneling regimes
• Counting statistics and super-Poissonian noise in a quantum dot
• Molecular states in carbon nanotube double quantum dots
• Coherent Transport through an interacting double quantum dot: Beyond sequential tunneling
• Poisson transition rates from time-domain measurements with finite bandwidth
• Shot noise in transport through "double quantum dots"
• Cotunneling-mediated transport through excited states in the Coulomb blockade regime
• Energy Dependent Tunneling in a Quantum Dot
• Resonant Tunneling through Multi-Level and Double Quantum Dots
• Time-resolved detection of single-electron interference
• Pauli spin blockade in cotunneling transport through a double quantum dot
• Measuring current by counting electrons in a nanowire quantum dot
• Co-tunneling assisted sequential tunneling in multi-level quantum dots

Cited by in corpus (17)

• Dipole coupling of a double quantum dot to a microwave resonator
• Electron counting in quantum dots
• Observation of excited states in a graphene double quantum dot
• Quantum dot admittance probed at microwave frequencies with an on-chip resonator
• Full counting statistics and shot noise of cotunneling in quantum dots and single-molecule transistors
• Tunable dynamical channel blockade in double-dot Aharonov-Bohm interferometers
• Heat driven transport in serial double quantum dot devices
• Counting statistics of cotunneling electrons
• Shot noise spectroscopy on a semiconductor quantum dot in the elastic and inelastic cotunneling regimes
• Electronic triple-dot transport through a bilayer graphene island with ultrasmall constrictions
• Distribution of waiting times between electron cotunnelings
• Electron Waiting Times in a Strongly Interacting Quantum Dot: Interaction Effects and Higher-Order Tunneling Processes
• Shot noise of a quantum dot measured with GHz stub impedance matching
• Measurements of a Quantum Dot with an Impedance-Matching On-Chip LC Resonator at GHz Frequencies
• Sub Decoherence Time Generation and Detection of Orbital Entanglement
• Effect of Coulomb correlation on electron transport through concentric quantum ring-quantum dot structure
• Single-shot latched readout of a quantum dot qubit using barrier gate pulsing