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There has been much work on explaining Hawking radiation as a quantumtunneling process through horizons. Basically, this intuitive picture requiresthe calculation of the imaginary part of the action for outgoing particle. Andtwo ways are known for achieving this goal: the null-geodesic method and theHamilton-Jacobi method. We apply these methods to the charged black holes in 2Ddilaton gravity which is originated from the low energy effective theory oftype 0A string theory. We derive the correct Hawking temperature of the blackholes including the effect of the back reaction of the radiation, and obtainthe entropy by using the 1st law of black hole thermodynamics. For fixed-chargeensemble, the 0A black holes are free of phase transition and thermodynamicallystable regardless of mass-charge ratio. We show this by interpreting the backreaction term as the inverse of the heat capacity of the black holes. Finally,the possibility of the phase transition in the fixed-potential ensemble isdiscussed.

Hawking radiation as tunneling from charged black holes in 0A string theory