Detection and measurement of spin-dependent dynamics in random telegraph signals

Abstract

A quantum point contact was used to observe single-electron fluctuations of a quantum dot in a GaAs heterostructure. The resulting random telegraph signals (RTS) contain statistical information about the electron spin state if the tunneling dynamics are spin-dependent. We develop a statistical method to extract information about spin-dependent dynamics from RTS and use it to demonstrate that these dynamics can be studied in the thermal energy regime. The tunneling rates of each spin state are independently measured in a finite external magnetic field. We confirm previous findings of a decrease in overall tunneling rates for the spin excited state compared to the ground state as an external magnetic field is increased.

Phys. Rev. Lett.; 5 pages, 3 figures

References in corpus (6)

• Observation of quantum jumps in a superconducting artificial atom
• Single-shot readout of electron spin states in a quantum dot using spin-dependent tunnel rates
• Universal oscillations in counting statistics
• Electron counting in quantum dots
• Excited-state spectroscopy on a nearly-closed quantum dot via charge detection
• Spin-dependent tunneling into an empty lateral quantum dot

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• Semiclassical spin-spin dynamics and feedback control in transport through a quantum dot
• Threshold-independent method for single-shot readout of spin qubits in semiconductor quantum dots
• Spin-qubit readout analysis based on a hidden Markov model