Related Content
Search Google Scholar for:
More Information
Related Jobs from ScienceCareers
|
|
Science 15 December 2006:
Vol. 314. no. 5806, p. 1653
DOI: 10.1126/science.314.5806.1653c
|
|
This Week in Science
In the quantum spin Hall effect (QSHE), coupling between the orbital and spin angular momentum of an electron on the edges of a bulk insulating state creates a conduction state that allows charge flow in only one direction. It does not require any external magnetic field (whose presence would break time-reversal symmetry), and it has been suggested that the helical edge states could conduct without dissipation. Although graphene exhibits characteristics of this state, its small energy gap complicates experimental observations. Bernevig et al. (p. 1757; see the Perspective by Kane and Mele) present theoretical work proposing that HgTe/CdTe quantum-well structures should be a more robust QSHE system, and present a outline of how the effect could be experimentally detected.
|
|
Science. ISSN 0036-8075 (print), 1095-9203 (online)
