Controlling the interaction of electron and nuclear spins in a tunnel-coupled quantum dot

C. Kloeffel, P. A. Dalgarno, B. Urbaszek, B. D. Gerardot, D. Brunner, P. M. Petroff, D. Loss, R. J. Warburton

Research output: Contribution to journalArticle

Abstract

We present a technique for manipulating the nuclear spins and the emission polarization from a single optically active quantum dot. When the quantum dot is tunnel coupled to a Fermi sea, we have discovered a natural cycle in which an electron spin is repeatedly created with resonant optical excitation. The spontaneous emission polarization and the nuclear spin polarization exhibit a bistability. For a s+ pump, the emission switches from s+ to s- at a particular detuning of the laser. Simultaneously, the nuclear spin polarization switches from positive to negative. Away from the bistability, the nuclear spin polarization can be changed continuously from negative to positive, allowing precise control via the laser wavelength. © 2011 American Physical Society.

Original languageEnglish
Article number046802
Pages (from-to)-
Number of pages4
JournalPhysical Review Letters
Volume106
Issue number4
DOIs
Publication statusPublished - 25 Jan 2011

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