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Optical manipulation of coherent phonons in superconducting YBa2Cu3O7-delta thin films
Yasuaki Okano1, Hiroyuki Katsuki, Yoshihiro Nakagawa
1Institute for Molecular Science, National Institutes of Natural Sciences, Okazaki, 444-8585, Japan.
Faraday Discussions
|March 29, 2012
Summary
Researchers optically controlled vibrations in YBa2Cu3O7-delta thin films below the superconductivity transition temperature. This phonon manipulation offers a new route to control superconductivity, potentially advancing materials science.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Quantum Optics
Background:
- Coherent phonons in YBa2Cu3O7-delta are strongly coupled to superconductivity.
- Controlling these phonons below the transition temperature is a potential method for controlling superconductivity.
Purpose of the Study:
- To demonstrate optical manipulation of Ba-O and Cu-O vibrations in YBa2Cu3O7-delta thin films.
- To explore the control of superconductivity via phonon manipulation.
Main Methods:
- Using femtosecond laser pulses to optically excite Ba-O and Cu-O vibrations.
- Tuning the interpulse delay to integral and half-integral multiples of phonon oscillation periods.
Main Results:
- Successfully enhanced and suppressed the amplitude of specific phonon modes (Ba-O and Cu-O vibrations).
- Demonstrated precise optical control over lattice vibrations below the superconducting transition temperature.
Conclusions:
- Optical manipulation of coherent phonons is achievable in YBa2Cu3O7-delta.
- This technique provides a promising pathway for controlling superconductivity through phonon interactions.
