Controlling the nuclear polarization in quantum dots using optical pulses with a modest bandwidth

Abstract

We show that detuned optical pulse trains with a modest spectral width can polarize nuclear spins in InAs quantum dots. The pulse bandwidth is large enough to excite a coherent superposition of both electron spin eigenstates in these negatively charged dots but narrow enough to give partial spectral selectivity between the eigenstates. The coherent precession of electron spin states and periodic excitation focuses the nuclear spin distribution, producing a discrete set of precession modes. The spectral selectivity generates a net nuclear polarization, through a mechanism that relies on optical spin rotations rather than electron spin relaxation.

7 pages, 7 figures

References in corpus (10)

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Cited by in corpus (6)

• Theory of dynamic nuclear polarization and feedback in quantum dots
• Dynamic nuclear polarization in InGaAs/GaAs and GaAs/AlGaAs quantum dots under non-resonant ultra-low power optical excitation
• Ultra long spin decoherence times in graphene quantum dots with a small number of nuclear spins
• Spin decoherence in graphene quantum dots due to hyperfine interaction
• Decay and revival of electron spin polarization in an ensemble of (In,Ga)As quantum dots
• Driven dynamics of a quantum dot electron spin coupled to bath of higher-spin nuclei