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SUMMARY:Observation of solitons in a quantum degenerate plasma
DTSTART:20160204T163000
DTEND:20160204T173000
DTSTAMP:20260924T112854Z
UID:c3bdef3a2030f072c5334782c3871e48dddf9c7d0e5c17e5f6ff749a
CATEGORIES:Conferences - Seminars
DESCRIPTION:Prof. Klaus Muller-Dethlefs\nThe Photon Science Institute and 
 School of Chemistry\,University of Manchester\, Alan Turing Building\, M
 anchester M13 9PL\nWe are reporting a very surprising result:\nthe observa
 tion of solitons in a quantum degenerate plasma.\nA very long life-time (>
 0.3 ms) quantum degenerate molecular Rydberg plasma is produced in the hig
 h-density region of a pulsed supersonic jet expansion (10% NO in neon\, 5b
 ar) by two-colour resonant excitation of nitric oxide into the high-n Rydb
 erg threshold region close to the ionization limit.\nConsidering the well-
 known properties of pulsed supersonic jet expansions the plasma densities 
 reached in our experiments are between 1e13 and 1e16 cm–3 and the electr
 on de Broglie wavelength becomes larger than the Wigner-Seitz radius. Quan
 tum degeneracy implies that the electrons no longer follow the classical B
 oltzmann distribution but Fermi-Dirac statistics. When a Fermi-fluid is fo
 rmed\, three-body recombination is strongly quenched due to the Pauli-Prin
 ciple\, resulting in extremely long plasma lifetimes.\nSubjecting the plas
 ma to high electric field pulses with nanosecond rise- and fall-times indu
 ces very sharp resonances in the observed spectrum. These can be interpret
 ed as solitons (= ”standing waves”) of counter-propagating surface pla
 smons\, which are excited by certain combinations of pulsed fields.\nThe l
 ecture will outline a textbook interpretation for these observations.
LOCATION:CH G1 495 https://plan.epfl.ch/?room==CH%20G1%20495
STATUS:CONFIRMED
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