Electrically Driven Reverse Overhauser Pumping of Nuclear Spins in Quantum Dots

2007/10/04 by Mark S. Rudner, M. S. Rudner, Leonid Levitov +1 · 2 citations
Physics and Astronomy · #Quantum and electron transport phenomena #Quantum optics and atomic interactions #Semiconductor Quantum Structures and Devices #cond-mat.mes-hall

paper · pdf · doi:10.1103/physrevlett.99.246602

published as Phys. Rev. Lett. 99, 246602 (2007)

arxiv created 2007/10/04 · openalex publication_date 2007/12/13 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

We propose a new mechanism for polarizing nuclear spins in quantum dots, based on periodic modulation of the hyperfine coupling by electric driving at the electron spin resonance frequency. Dynamical nuclear polarization results from resonant excitation rather than hyperfine relaxation mediated by a thermal bath, and thus is not subject to Overhauser-like detailed balance constraints. This allows polarization in the direction opposite to that expected from the Overhauser effect. Competition of the electrically driven and bath-assisted mechanisms can give rise to spatial modulation and sign reversal of polarization on a scale smaller than the electron confinement radius in the dot.

Citations

• Singlet-triplet decoherence due to nuclear spins in a double quantum dot
• The production of aspect marker in Cantonese-speaking children an experimental study
• Coherent Manipulation of Coupled Electron Spins in Semiconductor Quantum Dots

Cited by

• Exchange Control of Nuclear Spin Diffusion in a Double Quantum Dot
• Fine structure and optical pumping of spins in individual semiconductor quantum dots