Quantum Phononics: Introduction to Ultrafast Dynamics of Optical Phonons

This book presents quantum phononics as an exciting new field of research, and introduces readers to the quantum nature of phonons and their application to quantum technologies. Both the theory of and recent experiments in "quantum phononics," involving e.g. coherent phonons, phonon squeezing, coherent control, and phonon quantum technologies, are presented. The theoretical background of the generation and detection of phonons is described in a way that will be easy to understand for graduate students and experimental scientists who are newcomers to the field. Moreover, the book focuses on coherent phonons produced by ultrafast laser pulses, which can be used for the coherent control of atomic motions in solids and phase transformation. The laser-matter interaction is treated using a density matrix formalism of the time-dependent Schroeedinger equation. In addition, the third-order nonlinear optical response of condensed matter is also described.

Author Biography: Kazutaka Nakamura is an Associate Processor at the Laboratory for Materials and Structures, Institute of Innovative Research at Tokyo Institute of Technology. He received his doctoral degree in Nuclear Engineering from Tokyo Institute of Technology and previously served as a senior scientist at the Science and Technology Agency's National Research Institute for Metals (Japan). He is the author of over 200 scientific articles and reviews, spanning laser spectroscopy, chemical reaction dynamics, shock-induced high-pressure science, ultrafast phenomena, light/matter interactions, and the coherent control of phonons using laser light.

1. Introduction 2. Phonons 2.1. Classical description of lattice vibration 2.2. Harmonic oscillator (creation and annihilation operators, coherent states, squeezed states) 2.3. Quantum description of phonons 3. Coherent phonons 3.1. Generation mechanism of coherent phonons (Theory) 3.2. Detection mechanism (Theory) (optical detection, diffraction detection) 3.3. Experimental Examples (semimetals, semiconductors, super conductors, Topological insulators and other new functional materials) 4. Phonon squeezing 4.1. Squeezed state of phonons 4.2. Two-phonon squeezing 5. Coherent control of phonons 5.1. Introduction to coherent control 5.2. Theory of coherent control of phonons 5.3. Single-mode control 5.4. Multi-model control 6. Phonon quantum technology 6.1. Phonon quantum memory 6.2. Entanglement of phonons 7. Optomechanics 8. Phonon assisted phenomena