Direct Measurement of the Spin-Orbit Interaction in a Two-Electron InAs Nanowire Quantum Dot

Fasth, Carina; Fuhrer, Andreas; Samuelson, Lars; Golovach, Vitaly N.; Loss, Daniel

doi:10.1103/physrevlett.98.266801

Cited by 281 publications

(388 citation statements)

References 37 publications

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“…4. The 50 nm diameter nanowire is placed on top of five predefined Au gate electrodes [37][38][39]. The gate electrodes are electrically isolated from the nanowire by a 20 nm layer of silicon nitride SiN x .…”

Section: Cavity-coupled Dqdmentioning

confidence: 99%

Double Quantum Dot Floquet Gain Medium

et al. 2016

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Strongly driving a two-level quantum system with light leads to a ladder of Floquet states separated by the photon energy. Nanoscale quantum devices allow the interplay of confined electrons, phonons, and photons to be studied under strong driving conditions. Here, we show that a single electron in a periodically driven double quantum dot functions as a "Floquet gain medium," where population imbalances in the double quantum dot Floquet quasienergy levels lead to an intricate pattern of gain and loss features in the cavity response. We further measure a large intracavity photon number n c in the absence of a cavity drive field, due to equilibration in the Floquet picture. Our device operates in the absence of a dc current-one and the same electron is repeatedly driven to the excited state to generate population inversion. These results pave the way to future studies of nonclassical light and thermalization of driven quantum systems.

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Section: Cavity-coupled Dqdmentioning

confidence: 99%

Double Quantum Dot Floquet Gain Medium

et al. 2016

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“…The SOC can lift the Pauli spin blockade of electron tunneling in a DQD [33][34][35][36][37]. Our result explicitly shows that this reduction is due to the presence of the spinflipped tunneling.…”

Section: Soc-dependent Tunneling In a Nanowire Dqdmentioning

confidence: 70%

“…Because both the gap ∆ so = J [1] so / √ 2 at the anticrossing point and the singlet-triplet splitting J are experimentally measurable quantities [35,39], one can use Eq. (16) to obtain the SOC strength α via x so = /(m e α).…”

Section: For (C) and 2 For (D)mentioning

confidence: 99%

Anisotropic exchange coupling in a nanowire double quantum dot with strong spin-orbit coupling

You

2014

Phys. Rev. B

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A spin-orbit qubit is a hybrid qubit that contains both orbital and spin degrees of freedom of an electron in a quantum dot. Here we study the exchange coupling between two spin-orbit qubits in a nanowire double quantum dot (DQD) with strong spin-orbit coupling (SOC). We find that while the total tunneling in the DQD is irrelevant to the SOC, both the spin-conserved and spin-flipped tunnelings are SOC dependent and can compete with each other in the strong SOC regime. Moreover, the Coulomb repulsion between electrons can combine with the SOC-dependent tunnelings to yield an anisotropic exchange coupling between the two spin-orbit qubits. Also, we give an explicit physical mechanism for this anisotropic exchange coupling.

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“…Preexponential factors are model dependent, and a somewhat different estimate was proposed in Ref. [54]. In GaAs quantum dots [55], the SO coupling constant α is two orders of magnitude smaller than in InAs with l SO ≈ 30 μm, so that the SO coupling may be comparable to the hyperfine-induced coupling, and is usually considered as weaker than it.…”

Section: Discussionmentioning

confidence: 99%

Self-quenching of nuclear spin dynamics in the central spin problem

Brataas

Rashba

2014

Phys. Rev. B

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We consider, in the framework of the central spin s = 1/2 model, driven dynamics of two electrons in a double quantum dot subject to hyperfine interaction with nuclear spins and spin-orbit coupling. The nuclear subsystem dynamically evolves in response to Landau-Zener singlet-triplet transitions of the electronic subsystem controlled by external gate voltages. Without noise and spin-orbit coupling, subsequent Landau-Zener transitions die out after about 10 4 sweeps, the system self-quenches, and nuclear spins reach one of the numerous glassy dark states. We present an analytical model that captures this phenomenon. We also account for the multi-nuclear-specie content of the dots and numerically determine the evolution of around 10 7 nuclear spins in up to 2 × 10 5 Landau-Zener transitions. Without spin-orbit coupling, self-quenching is robust and sets in for arbitrary ratios of the nuclear spin precession times and the waiting time between Landau-Zener sweeps as well as under moderate noise. In the presence of spin-orbit coupling of a moderate magnitude, and when the waiting time is in resonance with the precession time of one of the nuclear species, the dynamical evolution of nuclear polarization results in stroboscopic screening of spin-orbit coupling. However, small deviations from the resonance or strong spin-orbit coupling destroy this screening. We suggest that the success of the feedback loop technique for building nuclear gradients is based on the effect of spin-orbit coupling.

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Direct Measurement of the Spin-Orbit Interaction in a Two-Electron InAs Nanowire Quantum Dot

Cited by 281 publications

References 37 publications

Double Quantum Dot Floquet Gain Medium

Double Quantum Dot Floquet Gain Medium

Anisotropic exchange coupling in a nanowire double quantum dot with strong spin-orbit coupling

Self-quenching of nuclear spin dynamics in the central spin problem

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