On the mechanism of electromagnetic microwave absorption in superfluid helium

Пашицкий, Э. А.; Пентегов, В. И.

doi:10.1134/s1063776112070138

Cited by 6 publications

(7 citation statements)

References 18 publications

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“…We note also that a supernarrow absorption line at the roton frequency was found in experiments with an electromagnetic resonator imbedded in He II [27,28]. Several models were proposed to explain this line [29,30,31].…”

Section: Introductionsupporting

confidence: 51%

“…We note that the relations ρ1,i ∼ E |i| 0 ρ1,0 and ρ0,i≥3 ∼ E i−2 0 ρ0,2 ensure the convergence of series (15) at sufficiently small E 0 . Substituting ρ1,±1 [30), (31] in (28), we get the formula for the sound velocity |u 1,0 | ≡ |u|:…”

Section: Nonsuperfluid Liquid Dielectric (He I)mentioning

confidence: 99%

“…Of course, solutions (30) and ( 31) are wrong near the resonance point (i.e., as δ → 0). In order to get a solution at the resonance point, we need to consider the viscosity in (1) and the nonlinear terms in ( 1) and ( 2), as well as in the chain of equations for ρ1,±i following from (1), (2).…”

Section: Nonsuperfluid Liquid Dielectric (He I)mentioning

confidence: 99%

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Acoustic modes in He I and He II in the presence of an alternating electric field

Tomchenko

2019

Preprint

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By means of the solution of the equations of ordinary and two-liquid hydrodynamics, we study the oscillatory eigenmodes in isotropic nonpolar dielectrics He I and He II in the presence of a weak alternating electric field E = E0iz sin (k0z − ω0t). The electric field and oscillations of the density become "coupled," since the density gradient causes a spontaneous polarization Ps, and the electric force contains the term (Ps∇)E. The analysis indicates that the field E changes the velocities of first and second sounds by the formula uj ≈ cj +χj E 2 0 (where j = 1, 2, cj is the velocity of the j-th sound for E0 = 0, and χj is a constant). We have found that the field E jointly with a wave of the first (second) sound (ω, k) should create in He II hybrid acousto-electric (thermo-electric) density waves (ω + lω0, k + lk0), where l = ±1, ±2, . . .. The amplitudes of acousto-electric waves and a change in the velocity of the first sound should resonantly increase at definite frequencies ω and ω0. These solutions can be verified experimentally.

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Section: Introductionsupporting

confidence: 51%

Section: Nonsuperfluid Liquid Dielectric (He I)mentioning

confidence: 99%

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Acoustic modes in He I and He II in the presence of an alternating electric field

Tomchenko

2019

Preprint

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“…A previous theoretical study has shown that when the local-field effect is accounted for in cuprate systems, the plasmon mechanism of Cooper pairing correctly describes the main properties of high-temperature superconductors. [8] The observation of low-energy plasmons in electron-doped cuprates [9] has provided experimental evidence on how collective modes play a critical role in mediating hightemperature superconductivity in multi-layer cuprate systems through the Coulomb interaction between the electrons in different CuO 2 planes. [10] Hence, charge localization in cuprates and the investigation of plasmons is important for the understanding of high-temperature superconductivity.…”

Section: Doi: 101002/adma202000153mentioning

confidence: 99%

Interfacial Oxygen‐Driven Charge Localization and Plasmon Excitation in Unconventional Superconductors

et al. 2020

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Charge localization is critical to the control of charge dynamics in systems such as perovskite solar cells, organic‐, and nanostructure‐based photovoltaics. However, the precise control of charge localization via electronic transport or defect engineering is challenging due to the complexity in reaction pathways and environmental factors. Here, charge localization in optimal‐doped La1.85Sr0.15CuO4 thin‐film on SrTiO3 substrate (LSCO/STO) is investigated, and also a high‐energy plasmon is observed. Charge localization manifests as a near‐infrared mid‐gap state in LSCO/STO. This is ascribed to the interfacial hybridization between the Ti3d‐orbitals of the substrate and O2p‐orbitals of the film. The interfacial effect leads to significant changes in the many‐body correlations and local‐field effect. The local‐field effect results in an inhomogeneous charge distribution, and due to perturbation by an external field, the high polarizability of this nonuniform charge system eventually generates the high‐energy plasmon. Transformation of the electronic correlations in LSCO/STO is further demonstrated via temperature‐dependent spectral‐weight transfer. This study of charge localization in cuprates and interfacial hybridization provides important clues to their electronic structures and superconductive properties.

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“…To date, a number of theoretical models are proposed to describe this effect (see [13][14][15][16][17] and references therein). No less interesting is superradiant Rayleigh scattering from a BEC, detected in [18][19][20], which differs from Rayleigh scattering in fluids (see [21] and references therein).…”

Section: Introductionmentioning

confidence: 99%

Frequency depending permittivity of Coulomb system with the Bose–Einstein condensate

Бобров

Trigger

2019

J. Phys.: Conf. Ser.

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The second-order singularity is found in the low-frequency region of the permittivity of a homogeneous and isotropic system of charged particles consisting of electrons and boson nuclei. This singularity is caused by the existence of a Bose-Einstein condensate for nuclei. The result obtained leads to the existence of the "nuclei superconductivity", which can be experimentally verified in superfluid He II. The results of the proposed an experiment can be considered as a direct proof of the existence of a Bose-Einstein condensate in superfluid He II. PACS number(s): 05.30.Jp, 52.25.Mq, 03.75.Kk, 03.75.Nt

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On the mechanism of electromagnetic microwave absorption in superfluid helium

Cited by 6 publications

References 18 publications

Acoustic modes in He I and He II in the presence of an alternating electric field

Acoustic modes in He I and He II in the presence of an alternating electric field

Interfacial Oxygen‐Driven Charge Localization and Plasmon Excitation in Unconventional Superconductors

Frequency depending permittivity of Coulomb system with the Bose–Einstein condensate

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