Ultrafast phase transition dynamics in GeSb alloys

We measure the femtosecond time resolved dielectric function of a-GeSb after excitation with an ultrashort laser pulse. The results reveal an ultrafast transition to a new non-thermodynamic phase which is not c-GeSb as previously believed. We present the most thorough experimental study to date of l...

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Bibliographic Details
Main Authors: Kim, A.M.-T., Solis, J., Callan, J.P., Roeser, C.A.D., Mazur, E.
Format: Conference Proceeding
Language:English
Subjects:
Dielectric materials
Dielectric measurements
Laser excitation
Laser transitions
Monitoring
Optical materials
Optical pulses
Phase change materials
Pulse measurements
Time measurement
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Summary:We measure the femtosecond time resolved dielectric function of a-GeSb after excitation with an ultrashort laser pulse. The results reveal an ultrafast transition to a new non-thermodynamic phase which is not c-GeSb as previously believed. We present the most thorough experimental study to date of laser induced ultrafast phase transitions in GeSb alloys. We investigate the changes of the material by directly monitoring the full dielectric function over a broad energy range (1.7 eV - 3.5 eV) with 100 fs time resolution.
DOI:10.1109/NLO.2000.883604