TY - JOUR
T1 - Interferometric control of spin-polarized electron populations at a metal surface observed by multiphoton photoemission
AU - Winkelmann, Aimo
AU - Lin, Wen Chin
AU - Bisio, Francesco
AU - Petek, Hrvoje
AU - Kirschner, Jürgen
PY - 2008/5/22
Y1 - 2008/5/22
N2 - In an interferometric pump-probe experiment, we demonstrate the phase tuning of the spin polarization of photoelectrons emitted in a three-photon process from Cu(001). A phase shift of π between delayed ultrafast circularly polarized light pulses can switch the spin polarization from ±20% to 40%. In the delay regime of overlapping pulses, we show the dominating role of optical interference effects in determining the spin polarization. For longer delays, we detect the influence of the coherent material response, manifested in both the final state electron population as well as the final state spin polarization.
AB - In an interferometric pump-probe experiment, we demonstrate the phase tuning of the spin polarization of photoelectrons emitted in a three-photon process from Cu(001). A phase shift of π between delayed ultrafast circularly polarized light pulses can switch the spin polarization from ±20% to 40%. In the delay regime of overlapping pulses, we show the dominating role of optical interference effects in determining the spin polarization. For longer delays, we detect the influence of the coherent material response, manifested in both the final state electron population as well as the final state spin polarization.
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U2 - 10.1103/PhysRevLett.100.206601
DO - 10.1103/PhysRevLett.100.206601
M3 - Article
AN - SCOPUS:44249098302
SN - 0031-9007
VL - 100
JO - Physical Review Letters
JF - Physical Review Letters
IS - 20
M1 - 206601
ER -