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Science 25 October 1996:
Vol. 274. no. 5287, pp. 473 - 0
DOI: 10.1126/science.274.5287.473c
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This Week in Science

TWIS Image In theoretical physics, it is sometimes the case that the solution to one problem can be used to solve another by the proper transformation of the system, such as switching the role of electrical fields and charges with their magnetic analogs in electromagnetism (see the Perspective by Girvin, p. 524). Shahar et al. (p. 589) measured the current-voltage characteristics of a fractional quantum Hall effect fluid and its nearby insulating state and found that the results are essentially identical for the two states when current and voltage are interchanged. The existence of this duality symmetry for charge and magnetic flux may lead to new theoretical insights into the quantum Hall effect.




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Science. ISSN 0036-8075 (print), 1095-9203 (online)