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Author Han, S. ♦ Rouse, R. ♦ Lukens, J. E.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword PHYSICS ♦ SQUID DEVICES ♦ ENERGY LEVELS ♦ POPULATION INVERSION ♦ MAGNETIC FLUX ♦ RF SYSTEMS ♦ QUANTIZATION
Abstract A population inversion has been created between the two adjacent fluxoid wells (with energy difference {var_epsilon}) in an rf SQUID subject to weak radiation at 100 GHz. The states in the two wells have opposite currents, of magnitude {approximately}2 {mu}A, circulating through an inductance of 0.2 nH.The steady state population of the upper well {ital n}{sub {ital u}}({var_epsilon}) shows local maxima whose positions correspond to calculated photon absorption resonances between the ground state and an intermediate state. The maximum {ital n}{sub {ital u}}({var_epsilon}) is 0.94 compared to the expected thermal equilibrium value of {ital n}{sub {ital u}}({var_epsilon})=2{times}10{sup {minus}9}. {copyright} {ital 1996 The American Physical Society.}
ISSN 00319007
Educational Use Research
Learning Resource Type Article
Publisher Date 1996-04-01
Publisher Place United States
Journal Physical Review Letters
Volume Number 76
Issue Number 18


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