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