Fig. 2
Results. a Dependence of acoustic signal on sample B on bias. Signal taken using an exciting laser fluence on the transducer film of 2.5 mJ cm−2. b IV characteristic of sample B at 5 K. c Dependence of acoustic signal in both samples on the laser fluence incident on the transducer film. Signals on sample A were taken with 500 mV of bias applied to the device, while for sample B 100 mV was applied. d Temporal shift of the signals measured on sample B at 100 mV. e Dependence of acoustic signal on sample temperature. f Sample mobility as a function of temperature measured using a four-point method; the signals have been normalised to the mobility of sample A. Error bars were all estimated from the standard deviation of a repeated measurement
