Orbital Floquet engineering of exchange interactions in magnetic materials

Chaudhary, Swati; Hsieh, David; Refael, Gil

doi:10.1103/physrevb.100.220403

Cited by 37 publications

(27 citation statements)

References 79 publications

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“…Suppose that the pump frequency ω is sufficiently red-detuned from the Mott gap ∼ U − 4t h . If the charge sector remains inert out of equilibrium, then a perturbative calculation, which simultaneously integrates out charge degrees of freedom and photons, leads to a transient photoinduced renormalization of spin-exchange interactions, proportional to Chaudhary et al, 2019;Itin and Katsnelson, 2015;Mentink et al, 2015).…”

Section: Engineering Correlated Systemsmentioning

confidence: 99%

Colloquium: Nonthermal pathways to ultrafast control in quantum materials

Torre

Kennes²,

Claassen³

et al. 2021

Rev. Mod. Phys.

293

128

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We review recent progress in utilizing ultrafast light-matter interaction to control the macroscopic properties of quantum materials. Particular emphasis is placed on photoinduced phenomena that do not result from ultrafast heating effects but rather emerge from microscopic processes that are inherently nonthermal in nature. Many of these processes can be described as transient modifications to the free energy landscape resulting from the redistribution of quasiparticle populations, the dynamical modification of coupling strengths and the resonant driving of the crystal lattice. Other pathways result from the coherent dressing of a material's quantum states by the light field. We discuss a selection of recently discovered effects leveraging these mechanisms, as well as the technological advances that led to their discovery. A road map for how the field can harness these nonthermal pathways to create new functionalities is presented.

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Section: Engineering Correlated Systemsmentioning

confidence: 99%

Colloquium: Nonthermal pathways to ultrafast control in quantum materials

Torre

Kennes²,

Claassen³

et al. 2021

Rev. Mod. Phys.

293

128

View full text Add to dashboard Cite

show abstract

“…Moreover, rigorous results for the onset of heating merely constitute worst-case bounds that could be significantly surpassed in appropriately-chosen systems. A theoretical framework to describe such settings, to access emergent meta-stable dynamical regimes and predict the associated time scales is thus highly desirable, to extend light-induced Floquet engineering to stronglycorrelated quantum systems and enable a host of new solidstate applications that range from the dynamical control of Mott insulators [41][42][43][44] or spin-orbital dynamics [45][46][47] to spin liquids [32] and fractional quantum Hall phases [48,49].…”

Section: Introductionmentioning

confidence: 99%

Flow Renormalization and Emergent Prethermal Regimes of Periodically-Driven Quantum Systems

Claassen

2021

Preprint

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We develop a flow renormalization approach for periodically-driven quantum systems, which reveals prethermal dynamical regimes and associated timescales via direct correspondence between real time and flow time behavior. In this formalism, the dynamical problem is recast in terms of coupling constants of the theory flowing towards an attractive fixed point that represents the thermal Floquet Hamiltonian at long times, while narrowly avoiding a series of unstable fixed points which determine distinct prethermal regimes at intermediate times. We study a class of relevant perturbations that trigger the onset of heating and thermalization, and demonstrate that the renormalization flow has an elegant representation in terms of a flow of matrix product operators. Our results permit microscopic calculations of the emergence of distinct dynamical regimes directly in the thermodynamic limit in an efficient manner, establishing a new computational tool for driven non-equilibrium systems.

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“…Its application to correlated materials is particularly intriguing. In frustrated magnets, Floquet engineering * vquito@iastate.edu can theoretically tune the underlying exchange interactions [40][41][42][43][44][45][46][47][48][49][50] and induce chiral fields [51] by tuning the frequency, amplitude and polarization of the light. Previous applications of Floquet to Kondo systems include tuning topological Kondo insulators [28], inducing eta pairing [52] and driving dynamical phase transitions in the quarter-filled single-channel case [53].…”

Section: Introductionmentioning

confidence: 99%

Floquet engineering multi-channel Kondo physics

Quito¹,

Flint²

2021

Preprint

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Floquet engineering is a powerful technique using periodic potentials, typically laser light, to drive materials into regimes inaccessible in equilibrium. Here, we show that Kondo models can be driven to multi-channel degenerate points, even when the starting model is single-channel. These emergent channels are differentiated by symmetry, and their strength and number can be controlled by changing the light polarization, frequency and amplitude. Unpolarized light, constructed by polarization averaging, is particularly useful to induce three and four channel degeneracies. Multichannel Kondo models host a wide variety of exotic phenomena, including non-Abelian anyons in impurity models and composite pair superconductivity in lattice models. We demonstrate our findings on both a simple square lattice toy model and a more realistic spin-orbit coupled model for J = 5/2 Ce ions in a tetragonal environment, as relevant for the Ce 115 materials, and show that the transition temperature for composite pair superconductivity can be dynamically enhanced.

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Orbital Floquet engineering of exchange interactions in magnetic materials

Cited by 37 publications

References 79 publications

Colloquium: Nonthermal pathways to ultrafast control in quantum materials

Colloquium: Nonthermal pathways to ultrafast control in quantum materials

Flow Renormalization and Emergent Prethermal Regimes of Periodically-Driven Quantum Systems

Floquet engineering multi-channel Kondo physics

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