Phonon-mediated vs. Coulombic Back-Action in Quantum Dot circuits - Condensed Matter > Mesoscale and Nanoscale PhysicsReport as inadecuate




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Abstract: Quantum point contacts QPCs are commonly employed to capacitively detectthe charge state of coupled quantum dots QD. An indirect back-action of abiased QPC onto a double QD laterally defined in a GaAs-AlGaAs heterostructureis observed. Energy is emitted by non-equilibrium charge carriers in the leadsof the biased QPC. Part of this energy is absorbed by the double QD where itcauses charge fluctuations that can be observed under certain conditions in itsstability diagram. By investigating the spectrum of the absorbed energy, weidentify both acoustic phonons and Coulomb interaction being involved in theback-action, depending on the geometry and coupling constants.



Author: D. Harbusch, D. Taubert, H.P. Tranitz, W. Wegscheider, S. Ludwig

Source: https://arxiv.org/



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