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Science 2 November 2007:
Vol. 318. no. 5851, p. 711
DOI: 10.1126/science.318.5851.711b
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This Week in Science

Charged carriers subjected to a magnetic field can be deflected and produce a Hall voltage across a sample. Confining the charged carriers to move in two dimensions can give rise to the quantum Hall effect. However, charge carriers also possess spin, and recent theoretical work indicates that spins can be affected by a voltage bias and give rise to a spin Hall effect for carriers confined to two dimensions. König et al. (p. 766, published online 20 September; see the Perspective by Nagaosa) performed transport measurements on HgTe/(Hg,Cd)Te quantum-well structures and present signatures of the quantum spin Hall effect.




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