title: Possible Demonstration of a Polaronic Bose-Einstein(-Mott) Condensate in UO2(+x) by Ultrafast THz Spectroscopy and Microwave Dissipation.
abstract: 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.
authors.affiliation: Synchrotron Soleil, L'Orme des Merisiers Saint-Aubin, BP 48 91192, Gif-sur-Yvette, France.
authors.forename: Steven D
authors.initials: SD
authors.lastname: Conradson
authors.affiliation: Los Alamos National Laboratory, P.O. Box 1663, Los Alamos, NM 87545, USA.
authors.forename: Steven M
authors.initials: SM
authors.lastname: Gilbertson
authors.affiliation: Department of Chemistry, University of Rochester, NY 14627, USA.
authors.forename: Stephanie L
authors.initials: SL
authors.lastname: Daifuku
authors.affiliation: Department of Chemistry, University of Rochester, NY 14627, USA.
authors.forename: Jeffrey A
authors.initials: JA
authors.lastname: Kehl
authors.affiliation: Los Alamos National Laboratory, P.O. Box 1663, Los Alamos, NM 87545, USA.
authors.forename: Tomasz
authors.initials: T
authors.lastname: Durakiewicz
authors.affiliation: Los Alamos National Laboratory, P.O. Box 1663, Los Alamos, NM 87545, USA.
authors.forename: David A
authors.initials: DA
authors.lastname: Andersson
authors.affiliation: Los Alamos National Laboratory, P.O. Box 1663, Los Alamos, NM 87545, USA.
authors.forename: Alan R
authors.initials: AR
authors.lastname: Bishop
authors.affiliation: Los Alamos National Laboratory, P.O. Box 1663, Los Alamos, NM 87545, USA.
authors.forename: Darrin D
authors.initials: DD
authors.lastname: Byler
authors.affiliation: Department of Physics and Astronomy, Uppsala University, S-75120, Uppsala, Sweden.
authors.forename: Pablo
authors.initials: P
authors.lastname: Maldonado
authors.affiliation: Department of Physics and Astronomy, Uppsala University, S-75120, Uppsala, Sweden.
authors.forename: Peter M
authors.initials: PM
authors.lastname: Oppeneer
authors.affiliation: Los Alamos National Laboratory, P.O. Box 1663, Los Alamos, NM 87545, USA.
authors.forename: James A
authors.initials: JA
authors.lastname: Valdez
authors.affiliation: Department of Chemistry, University of Rochester, NY 14627, USA.
authors.forename: Michael L
authors.initials: ML
authors.lastname: Neidig
authors.affiliation: Los Alamos National Laboratory, P.O. Box 1663, Los Alamos, NM 87545, USA.
authors.forename: George
authors.initials: G
authors.lastname: Rodriguez