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    Data from: Current-induced switching of thin film α-Fe2O3 devices imaged using a scanning single-spin microscope
    Qiaochu Guo; Anthony D’Addario; Yang Cheng; Jeremy Kline; Isaiah Gray; Hil Fung Harry Cheung; Fengyuan Yang; Katja C. Nowack; Gregory D. Fuchs (American Physical Society, 2023-06-05)
    Electrical switching of Néel order in an antiferromagnetic insulator is desirable as a basis for memory applications. Unlike electrically driven switching of ferromagnetic order via spin-orbit torques, electrical switching of antiferromagnetic order remains poorly understood. Here we investigate the low-field magnetic properties of 30-nm-thick, c-axis-oriented α-Fe2O3 Hall devices using a diamond nitrogen-vacancy center scanning microscope. Using the canted moment of α-Fe2O3 as a magnetic handle on its Néel vector, we apply a saturating in-plane magnetic field to create a known initial state before letting the state relax in low field for magnetic imaging. We repeat this procedure for different in-plane orientations of the initialization field. We find that the magnetic field images are characterized by stronger magnetic textures for fields along [¯1¯120] and [11¯20], suggesting that despite the expected 3-fold magnetocrystalline anisotropy, our α-Fe2O3 thin films have an overall in-plane uniaxial anisotropy. We also study current-induced switching of the magnetic order in α-Fe2O3. We find that the fraction of the device that switches depends on the current pulse duration, amplitude, and direction relative to the initialization field.
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    Data from: Hermitian Nonlinear Wave Mixing Controlled by a PT-Symmetric Phase Transition
    Flemens, Noah; Moses, Jeffrey (2023-04-27)
    These files contain data supporting all results reported in N. Flemens, et al., Hermitian Nonlinear Wave Mixing Controlled by a PT-Symmetric Phase Transition. In N. Flemens, et al. we found: While non-Hermitian systems are normally constructed through incoherent coupling to a larger environment, recent works have shown that under certain conditions coherent couplings can be used to similar effect. We show that this new paradigm enables the behavior associated with the PT-symmetric phase of a non-Hermitian subsystem to control the containing Hermitian system through the coherent couplings. This is achieved in parametric nonlinear wave mixing where simultaneous second harmonic generation replaces the role of loss to induce non-Hermitian behavior that persists through a full exchange of power within the Hermitian system. These findings suggest a new approach for the engineering of dynamics where energy recovery and sustainability are of importance that could be of significance for photonics and laser science.
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    Online Supplementary Material for: Consumer willingness to pay for shelf life of high-temperature-short-time (HTST)- pasteurized fluid milk: Implications for smart labeling and food waste reduction
    Endara, Paulina; Wiedmann, Martin; Adalja, Aaron (2023-03-15)
    This item consists of online supplementary material for the article "Consumer willingness to pay for shelf life of high-temperature-short-time (HTST)-pasteurized fluid milk: Implications for smart labeling and food waste reduction," by P. Endara, M. Wiedmann, and A. Adalja, published in Journal of Dairy Science. The file contains additional results tables and a copy of the survey instrument.
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    Data from: Efficient Parametric Amplification via Simultaneous Second Harmonic Generation
    Flemens, Noah; Swenson, Nicolas; Moses, Jeffrey (2021-09-07)
    We introduce a concept for efficient optical parametric amplification (OPA) based on simultaneously phase-matched idler second harmonic generation (SHG), which together exhibit the dynamical behavior of parametric amplification but with damped conversion-back-conversion cycles. This enables amplification efficiency exceeding that of conventional OPA by several-fold for femtosecond and picosecond signal pulses with bell-shaped intensity profiles by allowing a near-uniform spatiotemporal depletion of the pump wave. We develop a Duffing oscillator model that unifies the description of conventional OPA and amplification accompanied by idler photon displacement by either linear absorption or SHG. A spatiotemporal analysis of devices based on birefringent or superlattice quasi-phase matching in common bulk media predicts energy conversion up to 55%.
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    Data from: Observation of rapid adiabatic passage in optical four-wave mixing
    Ding, Xiaoyue; Heberle, Dylan; Harrington, Kerrianne; Flemens, Noah; Chang, Wei-Zung; Birks, Tim A.; Moses, Jeffrey (2020-03-30)
    We observe clear evidence of adiabatic passage between photon populations via a four-wave mixing process, implemented through a dispersion sweep arranged by a core diameter taper of an optical fiber. Photonic rapid adiabatic passage through the cubic electric susceptibility thus opens precise control of frequency translation between broadband light fields to all common optical media. Areas of potential impact include optical fiber and on-chip waveguide platforms for quantum information, ultrafast spectroscopy and metrology, and extreme light-matter interaction science.