TY - JOUR
T1 - Absence of phase-dependent noise in time-domain reflectivity studies of impulsively excited phonons
AU - Hussain, A.
AU - Andrews, S. R.
PY - 2010/6/17
Y1 - 2010/6/17
N2 - There have been several reports of phase-dependent noise in time-domain reflectivity studies of optical phonons excited by femtosecond laser pulses in semiconductors, semimetals, and superconductors. It was suggested that such behavior is associated with the creation of squeezed phonon states although there is no theoretical model that directly supports such a proposal. We have experimentally re-examined the studies of phonons in bismuth and gallium arsenide, and find no evidence of any phase-dependent noise signature associated with the phonons. We place an upper limit on any such noise at least 40-50 dB lower than previously reported.
AB - There have been several reports of phase-dependent noise in time-domain reflectivity studies of optical phonons excited by femtosecond laser pulses in semiconductors, semimetals, and superconductors. It was suggested that such behavior is associated with the creation of squeezed phonon states although there is no theoretical model that directly supports such a proposal. We have experimentally re-examined the studies of phonons in bismuth and gallium arsenide, and find no evidence of any phase-dependent noise signature associated with the phonons. We place an upper limit on any such noise at least 40-50 dB lower than previously reported.
UR - http://www.scopus.com/inward/record.url?scp=77956321927&partnerID=8YFLogxK
UR - http://dx.doi.org/10.1103/PhysRevB.81.224304
U2 - 10.1103/PhysRevB.81.224304
DO - 10.1103/PhysRevB.81.224304
M3 - Article
VL - 81
JO - Physical Review B : Condensed Matter and Materials Physics
JF - Physical Review B : Condensed Matter and Materials Physics
SN - 1098-0121
IS - 22
M1 - 224304
ER -