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29 March 2024 |
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Article overview
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Direct observation of ultrafast many-body electron dynamics in a strongly-correlated ultracold Rydberg gas | Nobuyuki Takei
; Christian Sommer
; Claudiu Genes
; Guido Pupillo
; Haruka Goto
; Kuniaki Koyasu
; Hisashi Chiba
; Matthias Weidemüller
; Kenji Ohmori
; | Date: |
14 Apr 2015 | Abstract: | Many-body interactions govern a variety of important quantum phenomena
ranging from superconductivity and magnetism in condensed matter to solvent
effects in chemistry. Understanding those interactions beyond mean field is a
holy grail of modern sciences. AMO physics with advanced laser technologies has
recently emerged as a new platform to study quantum many-body systems. One of
its latest developments is the study of long-range interactions among ultracold
particles to reveal the effects of many-body correlations. Rydberg atoms
distinguish themselves by their large dipole moments and tunability of dipolar
interactions. Most of ultracold Rydberg experiments have been performed with
narrow-band lasers in the Rydberg blockade regime. Here we demonstrate an
ultracold Rydberg gas in a complementary regime, where electronic coherence is
created using a broadband picosecond laser pulse, thus circumventing the
Rydberg blockade to induce strong many-body correlations. The effects of
long-range Rydberg interactions have been investigated by time-domain Ramsey
interferometry with attosecond precision. This approach allows for the
real-time observation of coherent and ultrafast many-body dynamics in which the
electronic coherence is modulated by the interaction-induced correlations. The
modulation evolves more rapidly than expected for two-body correlations by
several orders of magnitude. We have actively controlled such ultrafast
many-body dynamics by tuning the principal quantum number and the population of
the Rydberg state. The observed Ramsey interferograms are well reproduced by a
theoretical model beyond mean-field approximation, which can be relevant to
other similar many-body phenomena in condensed matter physics and chemistry.
Our new approach opens a new avenue to observe and manipulate nonequilibrium
dynamics of strongly-correlated quantum many-body systems on the ultrafast
timescale. | Source: | arXiv, 1504.3635 | Services: | Forum | Review | PDF | Favorites |
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