Light-wave control of correlated materials using quantum magnetism during time-periodic modulation of coherent transport

Lingos, P. C.; Kapetanakis, Myron D.; Wang, J.; Perakis, I. E.

doi:10.1038/s42005-021-00561-z

Cited by 5 publications

(4 citation statements)

References 79 publications

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“…Alternating 'electromagnetic' bias, in contrast to d.c. bias, is emerging as a universal control concept to enable dynamical functionalities by terahertz (THz) modulation [1][2][3][4][5][6][7][8][9][10] . THz-lightwave-accelerated superconducting (SC) and topological currents 8,9,[11][12][13][14][15][16][17][18] have revealed exotic quantum dynamics, for example, high harmonics 9,11,19 and gapless quantum fluid states 20 , and light-induced Weyl and Dirac nodes 1,15 . However, high-order correlation characteristics far exceeding the known two-photon light coupling to superconductors are hidden in conventional single-particle spectroscopies and perturbative responses, where a mixture of multiple excitation pathways contribute to the same low-order responses 21,22 .…”

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confidence: 99%

Quantum coherence tomography of light-controlled superconductivity

et al. 2022

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The coupling between superconductors and oscillation cycles of light pulses, i.e., lightwave engineering, is an emerging control concept for superconducting quantum electronics. Although progress has been made towards terahertz-driven superconductivity and supercurrents, the interactions able to drive non-equilibrium pairing are still poorly understood, partially due to the lack of measurements of high-order correlation functions. In particular, the sensing of exotic collective modes that would uniquely characterize light-driven superconducting coherence, in a way analogous to the Meissner effect, is very challenging but much needed. Here we report the discovery of parametrically driven superconductivity by light-induced order-parameter collective oscillations in iron-based superconductors. The time-periodic relative phase dynamics between the coupled electron and hole bands drives the transition to a distinct parametric superconducting state out-of-equalibrium. This light-induced emergent coherence is characterized by a unique phase–amplitude collective mode with Floquet-like sidebands at twice the Higgs frequency. We measure non-perturbative, high-order correlations of this parametrically driven superconductivity by separating the terahertz-frequency multidimensional coherent spectra into pump–probe, Higgs mode and bi-Higgs frequency sideband peaks. We find that the higher-order bi-Higgs sidebands dominate above the critical field, which indicates the breakdown of susceptibility perturbative expansion in this parametric quantum matter.

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confidence: 99%

Quantum coherence tomography of light-controlled superconductivity

et al. 2022

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“…The THz frequency magnons 18 – 24 is central for emergent spin-wave interference-based devices 25 at least 1000 times faster than the magneto-optical recording and device technologies that use thermal-magnetic excitations. Furthermore, THz control of magnetism is cross-cutting for coherent magnonics 10 – 12 , 26 – 28 , quantum magnetism 1 , 9 , 29 , antiferromagnetic (AFM) spintronics 2 , 3 , 26 , and quantum computing 30 .…”

Section: Introductionmentioning

confidence: 99%

Extreme terahertz magnon multiplication induced by resonant magnetic pulse pairs

Huang,

Luo,

Mootz

et al. 2024

Nat Commun

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Nonlinear interactions of spin-waves and their quanta, magnons, have emerged as prominent candidates for interference-based technology, ranging from quantum transduction to antiferromagnetic spintronics. Yet magnon multiplication in the terahertz (THz) spectral region represents a major challenge. Intense, resonant magnetic fields from THz pulse-pairs with controllable phases and amplitudes enable high order THz magnon multiplication, distinct from non-resonant nonlinearities such as the high harmonic generation by below-band gap electric fields. Here, we demonstrate exceptionally high-order THz nonlinear magnonics. It manifests as 7th-order spin-wave-mixing and 6th harmonic magnon generation in an antiferromagnetic orthoferrite. We use THz two-dimensional coherent spectroscopy to achieve high-sensitivity detection of nonlinear magnon interactions up to six-magnon quanta in strongly-driven many-magnon correlated states. The high-order magnon multiplication, supported by classical and quantum spin simulations, elucidates the significance of four-fold magnetic anisotropy and Dzyaloshinskii-Moriya symmetry breaking. Moreover, our results shed light on the potential quantum fluctuation properties inherent in nonlinear magnons.

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“…Understanding the magnetic properties of quantum materials is crucial for the development of new spintronic devices, quantum sensors, and quantum computer architectures [1][2][3][4][5][6][7][8][9][10]. Terahertz (THz) coherent spectroscopy [11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26] provides a powerful tool for characterizing the low-energy spin excitations of such materials, which are often inaccessible using other techniques.…”

Section: Introductionmentioning

confidence: 99%

Two-dimensional coherent spectrum of high-spin models via a quantum computing approach

Mootz,

Orth,

Huang

et al. 2024

Quantum Sci. Technol.

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We present and benchmark a quantum computing approach to calculate the two-dimensional coherent spectrum (2DCS) of high-spin models. Our approach is based on simulating their real-time dynamics in the presence of several magnetic field pulses, which are spaced in time. We utilize the adaptive variational quantum dynamics simulation algorithm for the study due to its compact circuits, which enables simulations over sufficiently long times to achieve the required resolution in frequency space. Specifically, we consider an antiferromagnetic quantum spin model that incorporates Dzyaloshinskii-Moriya interactions and single-ion anisotropy. The obtained 2DCS spectra exhibit distinct peaks at multiples of the magnon frequency, arising from transitions between different eigenstates of the unperturbed Hamiltonian. By comparing the one-dimensional coherent spectrum with 2DCS, we demonstrate that 2DCS provides a higher resolution of the energy spectrum. We further investigate how the quantum resources scale with the magnitude of the spin using two different binary encodings of the high-spin operators: the standard binary encoding and the Gray code. At low magnetic fields both encodings require comparable quantum resources, but at larger field strengths the Gray code is advantageous. Numerical simulations for spin models with increasing number of sites indicate a polynomial system-size scaling for quantum resources. Lastly, we compare the numerical 2DCS with experimental results on a rare-earth orthoferrite system. The observed strength of the magnonic high-harmonic generation signals in the 2DCS of the quantum high-spin model aligns well with the experimental data, showing significant improvement over the corresponding mean-field results.

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Light-wave control of correlated materials using quantum magnetism during time-periodic modulation of coherent transport

Cited by 5 publications

References 79 publications

Quantum coherence tomography of light-controlled superconductivity

Quantum coherence tomography of light-controlled superconductivity

Extreme terahertz magnon multiplication induced by resonant magnetic pulse pairs

Two-dimensional coherent spectrum of high-spin models via a quantum computing approach

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