Abstract
We report the development of an experimental technique to measure the dynamics of electrical currents on the femtosecond timescale. The technique combines methods of coherent control with time- and angle-resolved photoelectron spectroscopy. Direct snapshots of the momentum distribution of the excited electrons as function of time are then determined by photoelectron spectroscopy. In this way we gain information on the generation and decay of ultrashort current pulses in unprecedented detail. In particular, this technique allows the observation of elastic electron scattering in terms of an incoherent population dynamics in momentum space. We have applied this optical current generation and detection scheme to electrons in so-called image-potential states which represent a prototype of two-dimensional electronic surface states. Electrons in these states are bound perpendicular to the metal surface by the Coulombic image potential whereas they can move almost freely parallel to the surface. For the (n=1) image-potential state of Cu(100) we find a decay time of 10 fs due to electron scattering with steps and surface defects.
| Original language | English (US) |
|---|---|
| Title of host publication | Proceedings of SPIE - The International Society for Optical Engineering |
| Volume | 7600 |
| DOIs | |
| State | Published - 2010 |
| Externally published | Yes |
| Event | Ultrafast Phenomena in Semiconductors and Nanostructure Materials XIV - San Francisco, CA, United States Duration: Jan 24 2010 → Jan 27 2010 |
Other
| Other | Ultrafast Phenomena in Semiconductors and Nanostructure Materials XIV |
|---|---|
| Country | United States |
| City | San Francisco, CA |
| Period | 1/24/10 → 1/27/10 |
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Keywords
- Coherent control
- Image-potential states
- Metal surfaces
- Time-resolved photoelectron spectroscopy
- Ultrafast electric currents
ASJC Scopus subject areas
- Applied Mathematics
- Computer Science Applications
- Electrical and Electronic Engineering
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
Cite this
Ultrafast coherent control of electric currents at metal surfaces. / Güdde, Jens; Rohleder, Marcus; Meier, Torsten; Koch, Stephan W; Höfer, Ulrich.
Proceedings of SPIE - The International Society for Optical Engineering. Vol. 7600 2010. 76001K.Research output: Chapter in Book/Report/Conference proceeding › Conference contribution
}
TY - GEN
T1 - Ultrafast coherent control of electric currents at metal surfaces
AU - Güdde, Jens
AU - Rohleder, Marcus
AU - Meier, Torsten
AU - Koch, Stephan W
AU - Höfer, Ulrich
PY - 2010
Y1 - 2010
N2 - We report the development of an experimental technique to measure the dynamics of electrical currents on the femtosecond timescale. The technique combines methods of coherent control with time- and angle-resolved photoelectron spectroscopy. Direct snapshots of the momentum distribution of the excited electrons as function of time are then determined by photoelectron spectroscopy. In this way we gain information on the generation and decay of ultrashort current pulses in unprecedented detail. In particular, this technique allows the observation of elastic electron scattering in terms of an incoherent population dynamics in momentum space. We have applied this optical current generation and detection scheme to electrons in so-called image-potential states which represent a prototype of two-dimensional electronic surface states. Electrons in these states are bound perpendicular to the metal surface by the Coulombic image potential whereas they can move almost freely parallel to the surface. For the (n=1) image-potential state of Cu(100) we find a decay time of 10 fs due to electron scattering with steps and surface defects.
AB - We report the development of an experimental technique to measure the dynamics of electrical currents on the femtosecond timescale. The technique combines methods of coherent control with time- and angle-resolved photoelectron spectroscopy. Direct snapshots of the momentum distribution of the excited electrons as function of time are then determined by photoelectron spectroscopy. In this way we gain information on the generation and decay of ultrashort current pulses in unprecedented detail. In particular, this technique allows the observation of elastic electron scattering in terms of an incoherent population dynamics in momentum space. We have applied this optical current generation and detection scheme to electrons in so-called image-potential states which represent a prototype of two-dimensional electronic surface states. Electrons in these states are bound perpendicular to the metal surface by the Coulombic image potential whereas they can move almost freely parallel to the surface. For the (n=1) image-potential state of Cu(100) we find a decay time of 10 fs due to electron scattering with steps and surface defects.
KW - Coherent control
KW - Image-potential states
KW - Metal surfaces
KW - Time-resolved photoelectron spectroscopy
KW - Ultrafast electric currents
UR - http://www.scopus.com/inward/record.url?scp=77951572421&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=77951572421&partnerID=8YFLogxK
U2 - 10.1117/12.839672
DO - 10.1117/12.839672
M3 - Conference contribution
AN - SCOPUS:77951572421
SN - 9780819479969
VL - 7600
BT - Proceedings of SPIE - The International Society for Optical Engineering
ER -