Resonance Effects of Excitons and Electrons: Basics and Applications

Front Cover
Springer, Jun 1, 2013 - Science - 283 pages

This book presents the various types of resonance effects on excitons, biexcitons and the local electronic centers (LEC) in solids, such as paramagnetic and paraelectric resonances on excitons, exciton acoustic resonance at intra- and interband transitions, radio-optical double resonance on excitons, hole-nuclear double resonance on localized biexcitons, ENDOR and acoustic ENDOR on LEC. The criteria for the generation of coherent photons, phonons and magnons by excitons are explained. The interactions of excitons and biexcitons with paramagnetic centers and nuclear spins, the indirect interaction between the PC through a field of excitons as well as the quasienergy spectrum of excitons and spin systems are discussed. It is proved that the interaction of paramagnetic centers with excitons increases the spin relaxation rate of paramagnetic centers in comparison with the case of their interaction with free carriers. The giant magneto-optical effects in semi-magnetic semiconductors are theoretically interpreted.

In recent years, a new perspective has been added to these systems and their interactions: They can be used for storing and processing information in the form of quantum bits (qubits), the building blocks of quantum computers. The basics of this emerging technology are explained and examples of demonstration-type quantum computers based on localized spins in solids are discussed.

 

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Contents

Excitons and Biexcitons in Semiconductors
1
Exciton Paramagnetic Paraelectric and ZeroField Resonances
27
Exciton Acoustic Resonance
65
Double Resonances
89
Investigation of Excitons by NMR Spectroscopy Methods
125
Interaction of Excitons with Paramagnetic Centers
147
Effects of Deep Saturation
171
Basics of Quantum Information Processing
187
Matrix of Unitary Operator U Defined by Means of Basis Function Operators of the Irreducible Representations of the Symmetry Point Groups
229
Color Symmetry and Time Reversal in Systems with HalfInteger Total Spin 392
233
Operators xi and eta
237
The Functions fk j
240
The Wave Functions PhiJM l l
245
Integral Ist
249
Unitarity of the Spinor Operators and TwoBoson Representation of the Angular Momentum 527
250
Glossary
255

Test Systems for Quantum Information Processing
206
Conclusions
225
Irreducible Tensor Operators YLMI
227
References
259
Index
277
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About the author (2013)

1983-1996 Professor of Department of General Physics, Faculty of Physics, State University of Moldova 1996-1997 Head of Department of General Physics, Faculty of Physics, State University of Moldova 1997-2005 Professor of the Department of Physics and Theoretical Physics, Faculty of Physics, State University of Moldova 2005-2008 Director of the National Center for Analytical Methods and Metrology of the Academy of Sciences of Moldova. 2008-pressent Head of the Laboratory “Magnetic Resonance and Laser Spectroscopy”, Center of Chemical Physics and Nanocomposites, Institute of Chemistry of the Academy of Sciences of Moldova