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2015 ; 5
(ä): 15278
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Possible Demonstration of a Polaronic Bose-Einstein(-Mott) Condensate in UO2(+x)
by Ultrafast THz Spectroscopy and Microwave Dissipation
#MMPMID26472071
Conradson SD
; Gilbertson SM
; Daifuku SL
; Kehl JA
; Durakiewicz T
; Andersson DA
; Bishop AR
; Byler DD
; Maldonado P
; Oppeneer PM
; Valdez JA
; Neidig ML
; Rodriguez G
Sci Rep
2015[Oct]; 5
(ä): 15278
PMID26472071
show ga
Bose-Einstein condensates (BECs) composed of polarons would be an advance because
they would combine coherently charge, spin, and a crystal lattice. Following our
earlier report of unique structural and spectroscopic properties, we now identify
potentially definitive evidence for polaronic BECs in photo- and chemically doped
UO2(+x) on the basis of exceptional coherence in the ultrafast time dependent
terahertz absorption and microwave spectroscopy results that show collective
behavior including dissipation patterns whose precedents are condensate vortex
and defect disorder and condensate excitations. That some of these signatures of
coherence in an atom-based system extend to ambient temperature suggests a novel
mechanism that could be a synchronized, dynamical, disproportionation excitation,
possibly via the solid state analog of a Feshbach resonance that promotes the
coherence. Such a mechanism would demonstrate that the use of ultra-low
temperatures to establish the BEC energy distribution is a convenience rather
than a necessity, with the actual requirement for the particles being in the same
state that is not necessarily the ground state attainable by other means. A
macroscopic quantum object created by chemical doping that can persist to ambient
temperature and resides in a bulk solid would be revolutionary in a number of
scientific and technological fields.