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

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

2008-09-10

arxiv.org/abs/0809.1887v1

Physics

Condensed Matter

Strongly Correlated Electrons

Scientific paper

10.1103/PhysRevB.79.121304

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.

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