QUANTUM BEATS IN SEMICONDUCTORS

2007 ◽  
Vol 21 (08n09) ◽  
pp. 1621-1625
Author(s):  
CHRISTIAN H. ZIENER ◽  
THOMAS KAMPF ◽  
WOLFGANG R. BAUER ◽  
PETER M. JAKOB ◽  
STEPHAN GLUTSCH ◽  
...  
Keyword(s):  
Faraday Rotation ◽  
Beat Frequency ◽  
Magnetic Semiconductor ◽  
Quantum Beat ◽  
Quantum Beats ◽  
Level System ◽  
Pump Probe ◽  
Light Pulses ◽  
Band Parameter ◽  
Band Dispersion

In this paper we present a new method to calculate the Faraday rotation using the Jones calculus applicable to light pulses. This result is used to calculate the quantum beats in a magnetic semiconductor generated by pump-probe experiments in Faraday geometry. Considering a six level system and neglecting band dispersion as well as Coulomb interaction we find the Luttinger parameter of the valence band to be the only band parameter contributing to the quantum beat frequency.

scholarly journals Quantum Beats in Transient Spectroscopy of J-Aggregates

1996 ◽  
Vol 16 (3) ◽  
pp. 179-196
Author(s):  
H. Glaeske ◽  
K.-H. Feller ◽  
E. Gaišaukas ◽  
L. Knöll
Keyword(s):  
Transient Absorption ◽  
Temporal Evolution ◽  
Quantum Beat ◽  
Quantum Beats ◽  
Level System ◽  
Temperature Dependent ◽  
Phase Relaxation ◽  
Experimental Conditions ◽  
J Aggregates ◽  
Transient Spectroscopy

Quantum beats in transient absorption of PIC-J-aggregates, modelled by a modified 3-level-system are calculated. Experimental conditions for the possibility of their observation are investigated. The influence of the temperature dependent phase relaxation on the temporal evolution of quantum beat signals is considered.

scholarly journals Excited-state dynamics of overlapped optically-allowed 1B(u)+ and optically-forbidden 1B(u)- or 3A(g)- vibronic levels of carotenoids: possible roles in the light-harvesting function.

2012 ◽  
Vol 59 (1) ◽  
Author(s):  
Yasushi Koyama ◽  
Yoshinori Kakitani ◽  
Hiroyoshi Nagae
Keyword(s):  
Internal Conversion ◽  
Selection Rule ◽  
Polar Solvent ◽  
Selective Excitation ◽  
Stimulated Emission ◽  
Quantum Beat ◽  
Pump Probe ◽  
Cross Term ◽  
Hand Pump ◽  
Probe Spectroscopy

Pump-probe spectroscopy after selective excitation of all-trans Cars (n = 9-13) in nonpolar solvent identified a symmetry selection rule of diabatic electronic mixing and diabatic internal conversion, i.e., '1B(u)(+)-to-1B(u)(-) is allowed but 1B(u)(+)-to-3A(g)(-) is forbidden'. Kerr-gate fluorescence spectroscopy showed that this selection rule breaks down, due to the symmetry degradation when the Car molecules are being excited, and, as a result, the 1B(u)(+)-to-3A(g)(-) diabatic electronic mixing and internal conversion become allowed. On the other hand, pump-probe spectroscopy after coherent excitation of the same set of Cars in polar solvent identified three stimulated-emission components (generated by the quantum-beat mechanism), consisting of the long-lived coherent cross term from the 1B(u)(+) + 1B(u)(-) or 1B(u)(+) + 3A(g)(-) diabatic pair and incoherent short-lived 1B(u)(+) and 1B(u)(-) or 3A(g)(-) split incoherent terms. The same type of stimulated-emission components were identified in Cars bound to LH2 complexes, their lifetimes being substantially shortened by the Car-to-BChl singlet-energy transfer. Each diabatic pair and its split components appeared with high intensities in the first component. The low-energy shifts of the 1B(u)(+)(0), 1B(u)(-)(0) and 3A(g)(-)(0) levels and efficient triplet generation were also found.

Excited state hyperfine structures in 133Cs using quantum beat spectroscopy

1991 ◽  
Vol 69 (7) ◽  
pp. 808-812 ◽  
Author(s):  
J. Sagle ◽  
W. A. van Wijngaarden
Keyword(s):  
Excited State ◽  
Hyperfine Interaction ◽  
Quadrupole Moment ◽  
Magnetic Dipole ◽  
Electric Quadrupole ◽  
Quantum Beat ◽  
Quantum Beats ◽  
Electric Quadrupole Moment ◽  
Coupling Constant ◽  
Hyperfine Structures

Quantum beats arising from the hyperfine interaction were observed in the fluorescence produced when the 8D3/2, 9D3/2, and 10D3/2 states of 133Cs radiatively decayed to the 6P1/2 state. The period of the beats equals the reciprocal of the magnetic dipole coupling constant a since the 133Cs nucleus has a negligibly small electric quadrupole moment. The results are a = 3.95 ± 0.01, 2.38 ± 0.01, and 1.54 ± 0.02 MHz for the 8D3/2, 9D3/2, and 10D3/2 states, respectively.

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