Author/Authors :
Ogawa، نويسنده , , M. and Liu، نويسنده , , R.-Y. and Lin، نويسنده , , C.-H. and Yamamoto، نويسنده , , S. and Yukawa، نويسنده , , R. and Hobara، نويسنده , , R. and Tang، نويسنده , , S.-J. and Matsuda، نويسنده , , I.، نويسنده ,
Abstract :
Oscillatory relaxation of surface photovoltage has been observed by time-resolved photoemission spectroscopy on a Si(111)7 × 7 surface with a temporal period of several tens of nanoseconds. The oscillation was reproduced by solving non-linear Master equations that describe surface recombination of electron–hole pairs associated with the formation of exciton-like states at the surface. Appearance of non-linear phenomena is naturally expected by the model when high density photo-excited carriers are generated by the high power laser pulse.
Keywords :
Synchrotron radiation , Semiconductor surface , Surface photovoltage , carrier dynamics , time-resolved photoemission
