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7 papers · 1 filter
A Mott Insulator of Ultracold Alkaline-Earth-Like Atoms
Takeshi Fukuhara, Seiji Sugawa, Masahito Sugimoto +2
The transition from a superfluid to a Mott insulator (MI) phase has been observed in a Bose-Einstein condensate (BEC) of ytterbium (Yb) atoms in an optical lattice. An all-opticall…
Photon correlation in GaAs self-assembled quantum dots
T. Kuroda, M. Abbarchi, T. Mano +11
We report on photon coincidence measurement in a single GaAs self-assembled quantum dot (QD) using a pulsed excitation light source. At low excitation, when a neutral exciton line…
Condition for emergence of complex eigenvalues in the Bogoliubov-de Gennes equations
Y. Nakamura, M. Mine, M. Okumura +1
The condition for the appearance of dynamical instability of the Bose-condensed system, characterized by the emergence of complex eigenvalues in the Bogoliubov-de Gennes equations,…
Bose-Einstein Condensation of an Ytterbium Isotope
Takeshi Fukuhara, Seiji Sugawa, Yoshiro Takahashi
We report the observation of a Bose Einstein condensate in a bosonic isotope of ytterbium (170Yb). More than 10^6 atoms are trapped in a crossed optical dipole trap and cooled by e…
Hole states in wide band-gap diluted magnetic semiconductors and oxides
Tomasz Dietl
Puzzling disagreement between photoemission and optical findings in magnetically doped GaN and ZnO is explained within a generalized alloy theory. The obtained results show that th…
Transmission of severe acute respiratory syndrome in dynamical small-world networks
Naoki Masuda, Norio Konno, Kazuyuki Aihara
The outbreak of severe acute respiratory syndrome (SARS) is still threatening the world because of a possible resurgence. In the current situation that effective medical treatments…