MICROWAVE MODULATION OF COULOMB-BLOCKADE OSCILLATIONS IN A QUANTUM-DOT

The effects of microwave radiation on the Coulomb-blockade oscillation s in a quantum dot are investigated. The application of microwaves lea ds to a pronounced splitting of the Coulomb-blockade oscillations, who se magnitude is proportional to the microwave amplitude. From the obse rved amplitude dependence of the peak splitting, the electron temperat ure in the quantum dot can be estimated to be 100 mK. Interestingly, t his is different from that estimated by the minimum conductance betwee n adjacent Coulomb oscillation peaks.