Detector Backaction on the Self-Consistent Bound State in Quantum Point Contacts

Abstract

Bound-state (BS) formation in quantum point contacts (QPCs) may offer a convenient way to localize and probe single spins. In this letter, we investigate how such BSs are affected by monitoring them with a second QPC, which is coupled to the BS via wavefunction overlap. We show that this coupling leads to a unique detector backaction, in which the BS is weakened by increasing its proximity to the detector. We also show, however, that this interaction between the QPCs can be regulated at will, by using an additional gate to control their wavefunction overlap.

References in corpus (15)

• Single-shot read-out of an individual electron spin in a quantum dot
• Driven coherent oscillations of a single electron spin in a quantum dot
• Few-Electron Quantum Dot Circuit with Integrated Charge Read-Out
• Manipulation of a single charge in a double quantum dot
• The Low-Temperature Fate of the 0.7 Structure in a Point Contact: A Kondo-like Correlated State in an Open System
• Kondo model for the "0.7 anomaly" in transport through a quantum point contact
• Frequency-selective single photon detection using a double quantum dot
• Magnetic impurity formation in quantum point contacts
• Using a quantum dot as a high-frequency shot noise detector
• Local moment formation in quantum point contacts
• Effect of Exchange Interaction on Spin Dephasing in a Double Quantum Dot
• Probing the microscopic structure of bound states in quantum point contacts
• Telegraph Noise in Coupled Quantum Dot Circuits Induced by a Quantum Point Contact
• Detection of local-moment formation using the resonant interaction between coupled quantum wires
• Boundary-mediated electron-electron interactions in quantum point contacts

Cited by in corpus (13)

• Fano resonances in nanoscale structures
• Non-Hermitian Physics
• A review of progress in the physics of open quantum systems: theory and experiment
• What lurks below the last plateau: Experimental studies of the 0.7 x 2e^2/h conductance anomaly in one-dimensional systems
• Width bifurcation and dynamical phase transitions in open quantum systems
• Extreme sensitivity of the spin-splitting and 0.7 anomaly to confining potential in one-dimensional nanoelectronic devices
• Evidence for the Formation of Quasi-Bound-State in an Asymmetrical Quantum Point Contact
• Tuning the Fano Resonance with an Intruder Continuum
• Dynamical stabilization and time in open quantum systems
• Fano Resonance in a cavity-reflector hybrid system
• Thermoelectric Scanning Gate Interferometry on a Quantum Point Contact
• Detecting weak coupling in mesoscopic systems with a nonequilibrium Fano resonance
• On-chip quantum sensing of Kondo spins in a high-mobility quasi-one-dimensional nanoconstriction