Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2009-01-27
Phys. Rev. B 81, 245308 (2010) - Published June 9, 2010
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
13 pages, 3 figures, submitted to Nature Materials
Scientific paper
The nature of the nano-scale environment presents a major challenge for solid-state implementation of spin-based qubits. In this work, a single electron spin in an optically pumped nanometer-sized III-V semiconductor quantum dot is used to control a macroscopic nuclear spin of several thousand nuclei, freezing its decay and leading to spin life-times exceeding 100 seconds at low temperatures. Few-millisecond-fast optical initialization of the nuclear spin is followed by a slow decay exhibiting random telegraph signals at long delay times, arising from low probability electron jumps out of the dot. The remarkably long spin life-time in a dot surrounded by a densely-packed nuclear spin environment arises from the Knight field created by the resident electron, which leads to suppression of nuclear spin depolarization.
Chekhovich E. A.
Fal'ko Vladimir. I.
Krysa Andrey B.
Kulakovskii Vladimir D.
Makhonin M. N.
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