Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2007-08-06
Nature Physics v4, pp540-544 (2008)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
Published version. Supplementary Information in appendices
Scientific paper
Spin blockade occurs when an electron is unable to access an energetically favorable path through a quantum dot due to spin conservation, resulting in a blockade of the current through the dot. Spin blockade is the basis of a number of recent advances in spintronics, including the measurement and the manipulation of individual electron spins. We report measurements of the spin blockade regime in a silicon double quantum dot, revealing a complementary phenomenon: lifetime-enhanced transport. We argue that our observations arise because the decay times for electron spins in silicon are long, enabling the electron to maintain its spin throughout its transit across the quantum dot and access fast paths that exist in some spin channels but not in others. Such long spin lifetimes are important for applications such as quantum computation and, more generally, spintronics.
Blick Robert H.
Coppersmith Susan N.
Eriksson Mark A.
Friesen Mark
Joynt Robert
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