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Giant multiphoton absorption for THz resonances in silicon hydrogenic donors
- Source :
- Nature Photonics, 12, 179-186, Nature Photonics, 12, 3, pp. 179-186
- Publication Year :
- 2018
- Publisher :
- Springer Science and Business Media LLC, 2018.
-
Abstract
- The absorption of multiple photons when there is no resonant intermediate state is a well-known nonlinear process in atomic vapours, dyes and semiconductors. The N-photon absorption (NPA) rate for donors in semiconductors scales proportionally from hydrogenic atoms in vacuum with the dielectric constant and inversely with the effective mass, factors that carry exponents 6N and 4N, respectively, suggesting that extremely large enhancements are possible. We observed 1PA, 2PA and 3PA in Si: P with a terahertz free-electron laser. The 2PA coefficient for 1s-2s at 4.25 THz was 400,000,000 GM (= 4 x 10(-42) cm(4) s), many orders of magnitude larger than is available in other systems. Such high cross-sections allow us to enter a regime where the NPA cross-section exceeds that of 1 PA-that is, when the intensity approaches the binding energy per Bohr radius squared divided by the uncertainty time (only 3.84 MW cm(-2) in silicon)-and will enable new kinds of terahertz quantum control.
- Subjects :
- rydberg states
Photon
Silicon
Terahertz radiation
Binding energy
Physics::Optics
chemistry.chemical_element
semiconductors
02 engineering and technology
01 natural sciences
Effective mass (solid-state physics)
generation
0103 physical sciences
coherent control
FELIX
010306 general physics
free-electron-laser
Physics
Hydrogen-like atom
business.industry
excitation
021001 nanoscience & nanotechnology
2-photon spectroscopy
Atomic and Molecular Physics, and Optics
Electronic, Optical and Magnetic Materials
germanium
Semiconductor
chemistry
atomic-hydrogen
1s-2s transition
Atomic physics
0210 nano-technology
business
Bohr radius
Subjects
Details
- ISSN :
- 17494893 and 17494885
- Volume :
- 12
- Database :
- OpenAIRE
- Journal :
- Nature Photonics
- Accession number :
- edsair.doi.dedup.....d156a33c667a22d849c5db0026325193