Nir Davidson's Cold Atoms Group

 

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Prof. Nir Davidson

The Peter and Carola Kleeman Professorial Chair of Optical Sciences
Telephone
972-8-9342034
FAX
972-8-9344109
Postal address
Weizmann Institute of Science, Rehovot 76100, Israel
Electronic mail
 nir.davidson@weizmann.ac.il

 

Lab Profile

The main effort of my group is in the field of ultra-cold atoms (at temperatures of nano Kelvin above absolute zero) and Bose-Einstein condensation (BEC). One major effort is to study the motion of ultra-cold atoms, confined in dark optical traps shaped as optical billiards, and to study the interplay between their dynamics and spectrum. We showed that by combining the dark trapping approach which suppresses most of the perturbations to the trapped atoms, and our demonstration of optical billiards, where the small remaining perturbations are precisely controlled, yields extremely long atomic coherence times. Our long term goal is to establish ultra cold atoms as a tool to study the transition from classical to quantum nonlinear dynamics. Our recent discovery that quantum states in chaotic systems are much more fragile to small perturbations then similar states in regular systems is an important milestone to achieve this goal.


Our second main effort is to study the spectrum, dynamics and decay of excitations over Bose-Einstein condensates in dilute atomic gas a newly formed state with macroscopic quantum properties. We developed new spectroscopic and interference tools to accurately characterize these excitations. We applied them first under simple conditions where linear perturbation theory is suitable and then studied the effects of strong driving nonlinearities, strong confinement and reduced dimensionality, strong interactions, wave mixing and disorder, where new theories and concepts must be introduced. Our experiments lead to better understanding of interacting quantum degenerated systems that may then shed light on poorly understood systems such as high temperature super conductors.


Additional activities involve several fields in unconventional optics: (1) electromagnetic induced transparency, where we concentrate on slowing and storing light beams with interesting spatial distribution such as topologically-stable helical beams and generalized images, (2) increasing the power and improving the beam quality of lasers by phase locking and coherent combining of several lasers, and (3) developing new methods and elements for high numerical aperture laser focusing and microscopy, and diffuse light concentration at the thermodynamic limit, using new types of curved diffractive and reflecting optical elements, and by exploiting vectorial effects of the electromagnetic field which become important at large focusing angles.
 

Contact Information

Prof. Nir Davidson

Telephone
972-8-9342034
FAX
972-8-9344109
Postal address
Weizmann Institute of Science, Rehovot 76100, Israel
Electronic mail
General Information: nir.davidson@weizmann.ac.il
Webmaster: nir.bar-gill@weizmann.ac.il

 

Send mail to nir.bar-gill@weizmann.ac.il with questions or comments about this web site.
Last modified: 02/14/08