Phonon-mediated vs. Coulombic Back-Action in Quantum Dot circuits

Abstract

Quantum point contacts (QPCs) are commonly employed to capacitively detect the charge state of coupled quantum dots (QD). An indirect back-action of a biased QPC onto a double QD laterally defined in a GaAs/AlGaAs heterostructure is observed. Energy is emitted by non-equilibrium charge carriers in the leads of the biased QPC. Part of this energy is absorbed by the double QD where it causes charge fluctuations that can be observed under certain conditions in its stability diagram. By investigating the spectrum of the absorbed energy, we identify both acoustic phonons and Coulomb interaction being involved in the back-action, depending on the geometry and coupling constants.

References in corpus (11)

• Single-shot read-out of an individual electron spin in a quantum dot
• Fast Single-Charge Sensing with an rf Quantum Point Contact
• An electrostatically defined serial triple quantum dot charged with few electrons
• Frequency-selective single photon detection using a double quantum dot
• A double-dot quantum ratchet driven by an independently biased quantum point contact
• Single Shot Charge Detection Using A Radio-Frequency Quantum Point Contact
• Bimodal Counting Statistics in Single Electron Tunneling through a Quantum Dot
• Telegraph Noise in Coupled Quantum Dot Circuits Induced by a Quantum Point Contact
• Statistical electron excitation in a double quantum dot induced by two independent quantum point contacts
• Inelastic Backaction due to Quantum Point Contact Charge Fluctuations
• Counterflow of electrons in two isolated quantum point contacts

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