By N. Bloembergen (auth.), Baldassare Di Bartolo, Stamatios Kyrkos (eds.)
This booklet offers the court cases of the direction "Spectroscopy and Dynamics of Collective Excitations in Solids" held in Erice, Italy from June 17 to July 1, 1995. This assembly was once prepared through the foreign university of Atomic and Molecular Spectroscopy of the "Ettore Majorana" Centre for clinical tradition. the aim of this path was once to give and talk about actual types, mathematical formalisms, experimental recommendations and purposes correct to the topic of collective excitations in solids. via bringing jointly experts within the box of stable country spectroscopy, this path supplied a miles wanted discussion board for the severe evaluation and assessment of contemporary and earlier advancements within the physics of solids. a complete of eighty three members got here from fifty seven laboratories and 20 various nations (Austria, Belgium, Brazil, Denmark, Finland, France, Germany, Greece, Israel, Italy, Japan, The Netherlands, Norway, Portugal, Russia, Spain, Switzerland, Turkey, the uk, and the United States). The secretaries of the direction have been Stamatios okay yrkos and Daniel Di Bartolo. forty five lectures divided in thirteen sequence got. furthermore eight (one or two-hour) "long seminars," 1 "special lecture," 2 interdisciplinary lectures, 29 "short seminars," and sixteen posters have been offered. The series of lectures used to be in keeping with the logical improvement of the topic of the assembly. each one lecturer all started at a slightly primary point and eventually reached the frontier of data within the field.
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Extra info for Spectroscopy and Dynamics of Collective Excitations in Solids
Sample text
A. Quantum Mechanical Resonance Let us consider a system with a time-independent Hamiltonian Ho' The timedependent Schrodinger equation is written as follows H lfI = iii dlfl o dt (1) Spectroscopy and Dynamics of Collective EXcitations in Solids Edited by Di Bartolo, Plenum Press, New York, 1997 17 If the system is in a stationary state labeled i lfI(t) = lfIi(t) = lfIi(O)e -i(E;/Ii)t (2) where the energy values are given by (3) We shall assume that the wave functions lfIJt) are orthonormal. Let us now suppose that the system is subjected to a time-dependent perturbation represented by H (t).
LI'eI1I1l nZ) a lI'e (185) a In:) eigenfunction of the (a, a) radiation where = eigenfunction of the particle and oscillator. The energies of these states are given by (186) where E e = energy of the particles and the sum over a and a gives the energy of the radiation field. In the case of one photon absorption, the initial and the final states are given by respectively. Since lI'i = IlI':)lnZ)lnZ:).. (187) lI'/ = IlI'i )lnZ -1)lnZ} .... (188) (n: -lla:ln:) = R (189) 41 the relevant matrix element for the process of absorption of one photon is In the case of one photon emission, the initial and the final states are given by VI; =IVI:)ln~)ln~:)..
The long time changes in transmission are caused by real exciton population changes, caused by the pump in the tail of the absorption edge. ; o Figure 12. Room-temperature differential transmission spectra in a multiple quantum-well structure for various time delays between the broad-band 50 Is probe pulse and the 100 Is pump pulse applied above resonance (after Reference 27). to the detuning and the width of the exciton resonance. Then more complex changes in the probe absorption or emission may be expected in analogy to the situation in atomic spectroscopy.