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Discovery Projects - Grant ID: DP150101704

Title
Discovery Projects - Grant ID: DP150101704
Funding
ARC | Discovery Projects
Contract (GA) number
DP150101704
Start Date
2015/01/01
End Date
2017/12/31
Open Access mandate
no
Organizations
-
More information
http://purl.org/au-research/grants/arc/DP150101704

 

  • Vortices and vortex lattices in quantum ferrofluids

    Martin, A. M.; Marchant, N. G.; O'Dell, D. H. J.; Parker, N. G. (2016)
    Projects: ARC | Discovery Projects - Grant ID: DP150101704 (DP150101704)
    The experimental realization of quantum-degenerate Bose gases made of atoms with sizeable magnetic dipole moments has created a new type of fluid, known as a quantum ferrofluid, which combines the extraordinary properties of superfluidity and ferrofluidity. A hallmark of superfluids is that they are constrained to rotate through vortices with quantized circulation. In quantum ferrofluids the long-range dipolar interactions add new ingredients by inducing magnetostriction and instabilities, an...

    Quantum measurement of a rapidly rotating spin qubit in diamond

    Wood, Alexander A.; Lilette, Emmanuel; Fein, Yaakov Y.; Tomek, Nikolas; McGuinness, Liam P.; Hollenberg, Lloyd C. L.; Scholten, Robert E.; Martin, Andy M. (2018)
    Projects: ARC | Discovery Projects - Grant ID: DP150101704 (DP150101704)
    A controlled qubit in a rotating frame opens new opportunities to probe fundamental quantum physics, such as geometric phases in physically rotating frames, and can potentially enhance detection of magnetic fields. Realising a single qubit that can be measured and controlled during physical rotation is experimentally challenging. In this work, we demonstrate quantum control of a single nitrogen-vacancy (NV) centre within a diamond rotated at 200,000rpm, a rotational period comparable to the N...

    Magnetic pseudo-fields in a rotating electron-nuclear spin system

    Wood, A. A.; Lilette, E.; Fein, Y. Y.; Perunicic, V. S.; Hollenberg, L. C. L.; Scholten, R. E.; Martin, A. M. (2017)
    Projects: ARC | Discovery Projects - Grant ID: DP150101704 (DP150101704)
    A precessing spin observed in a rotating frame of reference appears frequency-shifted, an effect analogous to the precession of a Foucault pendulum observed on the rotating Earth. This frequency shift can be understood as arising from a magnetic pseudo-field in the rotating frame that nevertheless has physically significant consequences, such as the Barnett effect. Detecting these pseudo-fields is experimentally challenging, as a rotating-frame sensor is required. Previous work has realised c...

    Improved sensitivity to magnetic fields by rotation of quantum sensors

    Wood, A. A.; Aeppli, A. G.; Lilette, E.; Fein, Y. Y.; Stacey, A.; Hollenberg, L. C. L.; Scholten, R. E.; Martin, A. M. (2018)
    Projects: ARC | Discovery Projects - Grant ID: DP150101704 (DP150101704)
    Magnetic sensors are typically much more sensitive to oscillating (AC) magnetic fields than static (DC) fields, due to the presence of more noise at lower frequency, typically scaling with a $1/f$ dependence. For quantum magnetometers, this characteristic noise is reflected in the ensemble dephasing time $T_2^*$, the relevant sensing time for a DC field, being much lower than the spin coherence time $T_2$, which determines the sensitivity to AC fields. Here, we demonstrate measurement of DC m...

    Persistent superfluid flow arising from the He-McKellar-Wilkens effect in molecular dipolar condensates

    Wood, A. A.; McKellar, B. H. J.; Martin, A. M. (2016)
    Projects: ARC | Discovery Projects - Grant ID: DP150101704 (DP150101704)
    We show that the He-McKellar-Wilkens effect can induce a persistent flow in a Bose-Einstein condensate of polar molecules confined in a toroidal trap, with the dipolar interaction mediated via an electric dipole moment. For Bose-Einstein condensates of atoms with a magnetic dipole moment, we show that although it is theoretically possible to induce persistent flow via the Aharonov-Casher effect, the strength of electric field required is prohibitive. We also outline an experimental geometry t...

    Magneto-optical imaging of thin magnetic films using spins in diamond

    Simpson, David A.; Tetienne, Jean-Philippe; McCoey, Julia; Ganesan, Kumaravelu; Hall, Liam T.; Petrou, Steven; Scholten, Robert E.; Hollenberg, Lloyd C. L. (2015)
    Projects: NHMRC | Disease mechanisms in genetic epilepsies (1005050), ARC | Discovery Projects - Grant ID: DP150101704 (DP150101704), ARC | Australian Laureate Fellowships - Grant ID: FL130100119 (FL130100119)
    Imaging the fields of magnetic materials provides crucial insight into the physical and chemical processes surrounding magnetism, and has been a key ingredient in the spectacular development of magnetic data storage. Existing approaches using the magneto-optic Kerr effect (MOKE), x-ray and electron microscopy have limitations that constrain further development, and there is increasing demand for imaging and characterisation of magnetic phenomena in real time with high spatial resolution. In t...
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  • Scientific Results

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    PUBLICATIONS BY ACCESS MODE

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    Publications in Repositories

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