Spin-orbit interaction and anomalous spin relaxation in carbon nanotube quantum dots

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Bulaev, Denis V.
Trauzettel, Bjoern
Loss, Daniel
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Abstract
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We study spin relaxation and decoherence caused by electron-lattice and spin-orbit interaction and predict striking effects induced by magnetic fields $B$. For particular values of $B$, destructive interference occurs resulting in ultralong spin relaxation times $T_1$ exceeding tens of seconds. For small phonon frequencies $\omega$, we find a $1/\sqrt{\omega}$ spin-phonon noise spectrum -- a novel dissipation channel for spins in quantum dots -- which can reduce $T_1$ by many orders of magnitude. We show that nanotubes exhibit zero-field level splitting caused by spin-orbit interaction. This enables an all-electrical and phase-coherent control of spin.
Comment: 19 pages, 12 figures
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Condensed Matter - Mesoscale and Nanoscale Physics
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