Phase-sensitive probes of nuclear polarization in spin-blockaded transport
Author(s)Levitov, Leonid; Halperin, B. I.; Rudner, M. S.; Neder, I.
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Spin-blockaded quantum dots provide a unique setting for studying nuclear-spin dynamics in a nanoscale system. Despite recent experimental progress, observing phase-sensitive phenomena in nuclear spin dynamics remains challenging. Here we point out that such a possibility opens up in the regime where hyperfine exchange directly competes with a purely electronic spin-flip mechanism such as the spin-orbital interaction. Interference between the two spin-flip processes, resulting from long-lived coherence of the nuclear-spin bath, modulates the electron-spin-flip rate, making it sensitive to the transverse component of nuclear polarization. In a system repeatedly swept through a singlet-triplet avoided crossing, nuclear precession is manifested in oscillations and sign reversal of the nuclear-spin pumping rate as a function of the waiting time between sweeps. This constitutes a purely electrical method for the detection of coherent nuclear-spin dynamics.
DepartmentMassachusetts Institute of Technology. Department of Physics
Physical Review B
American Physical Society
Rudner, M. S. et al. “Phase-sensitive probes of nuclear polarization in spin-blockaded transport.” Physical Review B 82.4 (2010): 041311. © 2010 The American Physical Society.
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