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The 878th IMS colloquium

Lecture Title "Quantum Localization in Laser-Driven Molecular Rotation"
Date Wednesday 18 November 2015 16:00
Lecturer Ilya Sh. Averbukh (Weizmann Institute of Science, Israel)
Place

Institute for Molecular Science, Research Building, Seminar Room # 201
Summary

Recently we predicted that several celebrated solid state quantum localization phenomena – Anderson localization, Bloch oscillations, and Tamm-Shockley surface states – may manifest themselves in the rotational dynamics of laser-kicked molecules. In this talk, I will present these new rotational effects in a gas of linear molecules subject to a moderately long periodic train of femtosecond laser pulses. A small detuning of the train period from the rotational revival time causes Anderson localization in the angular momentum space above some critical value of J – the Anderson wall. This wall marks an impenetrable border stopping any further rotational excitation. Below the Anderson wall, the rotational excitation oscillates with the number of pulses due to a mechanism similar to Bloch oscillations in crystalline solids. I will present the results of the first experimental observation of the laser-induced rotational Bloch oscillations in molecular nitrogen at ambient conditions (Stanford & Weizmann, 2015). We will also discuss the prospects of observing the rotational analogues of the Tamm surface states in a similar experimental setup. Our results offer laser-driven molecular rotation as a new platform for studies on the localization phenomena in quantum transport. These effects are important for many processes involving highly excited rotational states, including coherent optical manipulations in molecular mixtures, and propagation of powerful laser pulses in atmosphere.

The 878th IMS colloquium

Speaker：Ilya Sh. Averbukh
Contact

OHMORI, Kenji
IINO, Ryota & MASAOKA, Shigeyuki (The members of the committee of the IMS colloquium in 2015)
Awards & Honors International collaboration

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