Hydrodynamic collective modes in graphene

Narozhny, B. N.; Gornyi, I. V.; Titov, M.

doi:10.1103/physrevb.103.115402

Cited by 32 publications

(30 citation statements)

References 73 publications

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“…For μ ∼ T , both the hydrodynamic and dissipative ("kinetic") contributions are of the same order. Now there is no small parameter in the theory and the full system of linearized hydrodynamic equations can be represented by a 6 × 6 matrix [92]. In the strongly doped regime (μ T ), the hydrodynamic contribution dominates and in addition the boundary scattering becomes diffusive.…”

Section: Discussionmentioning

confidence: 99%

Anti-Poiseuille flow in neutral graphene

2021

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Section: Discussionmentioning

confidence: 99%

Anti-Poiseuille flow in neutral graphene

2021

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“…We worked in the kinetic regime where plasmon frequency is much larger than the electron-electron scattering rate ω Γ ee [22]. In the low frequency hydrodynamic regime ω Γ ee [22,76,[86][87][88][89][90][91], the non-linear conductivities are similar in magnitude as long as the temperature is not much larger than chemical potential [22,23,92]. Therefore, our estimate of the generation rates should apply as well to the collective modes in the hydrodynamic regime such as the charged 'demons' [22,76,[86][87][88][89][90].…”

Section: Discussion and Experimental Outlookmentioning

confidence: 99%

“…In the low frequency hydrodynamic regime ω Γ ee [22,76,[86][87][88][89][90][91], the non-linear conductivities are similar in magnitude as long as the temperature is not much larger than chemical potential [22,23,92]. Therefore, our estimate of the generation rates should apply as well to the collective modes in the hydrodynamic regime such as the charged 'demons' [22,76,[86][87][88][89][90]. However, in the case of T µ, the demons become almost charge neutral, driven mainly by kinematic pressure, and the physics could be quite different.…”

Section: Discussion and Experimental Outlookmentioning

confidence: 99%

Graphene as a source of entangled plasmons

Sun,

Basov,

Fogler

2021

Preprint

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We analyze nonlinear optics schemes for generating pairs of quantum entangled plasmons in graphene. We predict that high plasmonic field concentration and strong optical nonlinearity of monolayer graphene enables pair-generation rates much higher than those of conventional photonic sources. The first scheme we study is spontaneous parametric down conversion in a graphene nanoribbon. In this second-order nonlinear process a plasmon excited by an external pump splits into a pair of plasmons, of half the original frequency each, emitted in opposite directions. The conversion is activated by applying a dc electric field that induces a density gradient or a current across the ribbon. Another scheme is degenerate four-wave mixing where the counter-propagating plasmons are emitted at the pump frequency. This third-order nonlinear process does not require a symmetrybreaking dc field. We suggest nano-optical experiments for measuring position-momentum entanglement of the emitted plasmon pairs. We estimate the critical pump fields at which the plasmon generation rates exceed their dissipation, leading to parametric instabilities.

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“…Nonreciprocal surface plasmons in 2D electron hydrodynamic materials-Collective behavior is one of the most intriguing aspects of the hydrodynamic approach. In fact, a number of previous works have applied hydrodynamics to analyze collective modes [44][45][46][47][48][49][50], particularly plasma modes [46][47][48][49][50]. We emphasize that our theory highlights both the effects of crystal symmetry and the geometrical effect of Bloch wave function, which have been rarely addressed in these previous works.…”

Section: Introduction-mentioning

confidence: 89%

Nonreciprocal electron hydrodynamics under magnetic fields: Applications to nonreciprocal surface magnetoplasmons

2021

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Recent experiments have elucidated that novel nonequilibrium states inherent in the so-called hydrodynamic regime are realized in ultrapure metals with sufficiently strong momentum-conserving scattering. In this letter, we formulate a theory of electron hydrodynamics with broken inversion symmetry under magnetic fields and find that novel terms emerge in hydrodynamic equations which play a crucial role for the realization of the nonreciprocal responses. Specifically, we clarify that there exist a novel type of nonreciprocal collective modes dubbed nonreciprocal surface magnetoplasmons arising from an interplay between magnetic fields and the orbital magnetic moment. We reveal that these nonreciprocal collective modes indeed give rise to the nonreciprocity in magneto-optical responses such as the reflectivity. The physics discussed here will bridge the two important notions of magnetoplasmonics and nonreciprocity in electron hydrodynamic materials with inversion symmetry breaking and magnetic fields.

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Hydrodynamic collective modes in graphene

Cited by 32 publications

References 73 publications

Anti-Poiseuille flow in neutral graphene

Anti-Poiseuille flow in neutral graphene

Graphene as a source of entangled plasmons

Nonreciprocal electron hydrodynamics under magnetic fields: Applications to nonreciprocal surface magnetoplasmons

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