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20 papers · 1 filter
Few-Electron Quantum Dot Circuit with Integrated Charge Read-Out
J. M. Elzerman, R. Hanson, J. S. Greidanus +5
We report on the realization of a few-electron double quantum dot defined in a two-dimensional electron gas by means of surface gates on top of a GaAs/AlGaAs heterostructure. Two q…
Far-infrared and submillimeter-wave conductivity in electron-doped cuprate La_{2-x}Ce_xCuO_4
A. Pimenov, A. V. Pronin, A. Loidl +2
We performed far-infrared and submillimeter-wave conductivity experiments in the electron-doped cuprate La_{2-x}Ce_xCuO_4 with x = 0.081 (underdoped regime, T_c = 25 K). The onset…
Optimization of evaporative cooling towards a large number of Bose-Einstein condensed atoms
Makoto Yamashita, Masato Koashi, Tetsuya Mukai +3
We study the optimization of evaporative cooling in trapped bosonic atoms on the basis of quantum kinetic theory of a Bose gas. The optimized cooling trajectory for Rb atoms…
In-situ growth of superconducting MgB2 thin films by molecular beam epitaxy
K Ueda, M. Naito
The in-situ growth of superconducting MgB2 thin films was examined from various perspectives. The paper discusses (1) growth temperature, (2) the effect of excess Mg, (3) the effec…
Tunnel junctions on as-grown superconducting MgB2 thin films
K. Ueda, M. Naito
We demonstrate that good superconductor/insulator/normal-metal tunnel junctions can be fabricated on as-grown superconducting MgB2 thin films. The as-grown films were prepared by c…
Allowed and forbidden transitions in artificial hydrogen and helium atoms
Toshimasa Fujisawa, David Guy Austing, Yasuhiro Tokura +2
The strength of radiative transitions in atoms is governed by selection rules. Spectroscopic studies of allowed transitions in hydrogen and helium provided crucial evidence for the…