scholarly journals Reconstruction of attosecond beating by interference of two-photon transitions in the bulk of solids

2021 ◽  
Author(s):  
Alvaro Jimenez-Galan ◽  
Rui Silva ◽  
Misha (Mikhail) Ivanov
Keyword(s):  
Numerical Simulations ◽  
Emission Spectroscopy ◽  
Relative Phase ◽  
Photoelectron Spectra ◽  
Interband Transitions ◽  
Interferometric Method ◽  
Molecular Systems ◽  
Two Photon ◽  
Pump And Probe ◽  
Electronic Dynamics

Abstract The reconstruction of attosecond beating by interference of two-photon transitions (RABBIT) is one of the most widely used techniques for resolving ultrafast electronic dynamics in atomic and molecular systems. As it relies on the interference of photo-electrons in vacuum, similar interference has never been contemplated in the bulk of crystals. Using accurate numerical simulations in a realistic system, here we show that the interference of two-photon transitions can be recorded directly in the bulk of solids and read out with standard angle-resolved photo-emission spectroscopy. The phase of the RABBIT beating in the photoelectron spectra coming from the bulk of solids is sensitive to the relative phase of the Berry connection between bands and it experiences a shift of π as one of the quantum paths crosses a band. For resonant interband transitions, the amplitude of the RABBIT oscillation decays as the pump and probe pulses are separated in time due to electronic decoherence, providing a simple interferometric method to extract dephasing times.

Simulation of multiwavelength conditions in laser picosecond ultrasonics

SIMULATION ◽  
2021 ◽  
pp. 003754972199645
Author(s):  
Philippe Babilotte
Keyword(s):  
Numerical Simulations ◽  
Acoustic Signal ◽  
Acoustic Waves ◽  
Bulk Material ◽  
Deformation Field ◽  
Optical Pump ◽  
Pump And Probe ◽  
Oriented Object ◽  
Numerical Approaches ◽  
Picosecond Ultrasonics

Complete numerical simulations are given under SciLab® and MATLAB® coding environments, concerning propagative acoustic wavefronts, for laser picosecond ultrasonics under multiwavelength conditions. Simulations of the deformation field and its propagation into bulk material are given under different wavelength configurations for optical pump and probe beams, which are used to generate and to detect the acoustic signal. Complete insights concerning the dynamics of the acoustic waves are given, considering the absence of carrier diffusions into the material. Several numerical approaches are proposed concerning both the functions introduced to simulate the wavefront ( Heaviside or error) and the coding approach (linear/vectorized/ Oriented Object Programming), under the pure thermo-elastic approach.

Theoretical study on two-photon absorption for symmetric molecular systems composed of charged groups linked with a π-conjugated bridge

2005 ◽  
Vol 154 (1-3) ◽  
pp. 181-184 ◽  
Author(s):  
R. Kishi ◽  
M. Nakano ◽  
S. Yamada ◽  
K. Kamada ◽  
K. Ohta ◽  
...  
Keyword(s):  
Theoretical Study ◽  
Photon Absorption ◽  
Molecular Systems ◽  
Two Photon Absorption ◽  
Two Photon

Phase- and helicity-dependent effects in three-color ionization

Open Physics ◽  
2004 ◽  
Vol 2 (2) ◽  
Author(s):  
Magda Fifirig ◽  
Marius Stroe
Keyword(s):  
Electromagnetic Field ◽  
Phase Difference ◽  
Ground State ◽  
Relative Phase ◽  
Ionization Rate ◽  
Laser Frequency ◽  
Phase Effect ◽  
Two Photon ◽  
Ir Laser ◽  
Photon Ionization

AbstractWe study the two-photon ionization of the hydrogen atom from its ground state by a three-color electromagnetic field consisting of a superposition of an IR laser and two of its consecutive odd harmonics of order 2p−1 and 2p+1, withp a positive integer and constant relative phase difference. The ionization process due to the net absorption of the energy 2pħω (ω being the IR laser frequency) is considered. The influence of phase difference and helicity on the azimuthal angular distribution of the ejected photoelectrons is illustrated in the case in which the two harmonics have identical polarizations. Phase effect on the alignment of the differential ionization rate is also investigated.

Observing Crystallization Molecule-By-Molecule Using Exciton Transfer/Emission Spectroscopy

1993 ◽  
Vol 47 (5) ◽  
pp. 625-627
Author(s):  
Daniel J. Graham ◽  
Dwayne L. Labrake
Keyword(s):  
Emission Spectroscopy ◽  
Research Groups ◽  
Molecular Systems ◽  
Exciton Transfer ◽  
The Sixties

A method for observing crystallization molecule-by-molecule is presented. The method is based on the properties of exciton transfer and emission spectroscopy, as established by several research groups during the sixties. The discussion centers on benzophenone (BZP) crystallization, although the ideas can be adapted to other molecular systems. It is the purpose here to pose a timely, relatively inexpensive way to monitor crystallization on an Ångstrom scale.

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