Alternative route to Bose-Einstein condensation of two-electron atoms

Autor:	Andreas Hemmerich, Chih-Yun Yang, Purbasha Halder
Rok vydání:	2012
Předmět:	Condensed Matter::Quantum Gases Physics Orders of magnitude (temperature) Condensation Evaporation Electron Atomic and Molecular Physics and Optics law.invention Optical pumping Dipole law Metastability Physics::Atomic Physics Atomic physics Bose–Einstein condensate
Zdroj:	Physical Review A. 85
ISSN:	1094-1622 1050-2947
DOI:	10.1103/physreva.85.031603
Popis:	We present a route to Bose-Einstein condensation devised for two-electron atoms, which do not admit practicable cooling techniques based upon narrow intercombination lines. A dipole trap for ${}^{40}$Ca atoms in the singlet ground state is loaded from a moderately cold source of metastable triplet atoms via spatially and energetically selective optical pumping permitting 4 orders of magnitude increase of the phase-space density. Further cooling to quantum degeneracy is achieved by forced evaporation optimized to minimize three-body losses. In a combined loading and evaporation cycle of less than 3 s we are able to condense 3000 atoms.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::01211d71208085031427fe18507ff5ca https://doi.org/10.1103/physreva.85.031603 Zobrazit plný text záznamu