On the electric activity of superfluid systems

Shevchenko, S. I.; Rukin, A. S.

doi:10.1134/s0021364009130098

Cited by 20 publications

(17 citation statements)

References 14 publications

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“…In the presence of interaction the order parameter ( , )    r r obtains an addition proportional to 1 ( , )  r R , the expression for which has been found in [6,9]. After substituting to (12) the corresponding expression for ( , )    r r , we find with linear accuracy in the interaction…”

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confidence: 55%

On the Dipole Moment of Quantized Vortices in the Presence of Flows

Shevchenko

Konstantinov

2016

J Low Temp Phys

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The polarization charge  of an inhomogeneous superfluid system is expressed as a function of the order parameter 1 2 ( , )  r r . It is shown that if the order parameter changes on macroscopic distances, the polarization charge pol  is proportional to 2 A n  , and the polarization P is proportional to A n  , where n is the density of the system. For noninteracting atoms the proportionality coefficient A is independent of density, and in the presence of interaction A is proportional to n . The change of the Bose gas density is found in the presence of a flow n s   w v v passing the vortex. It is found that a vortex in a superfluid film creates an electric potential above the film. This potential has the form of a potential of a dipole, allowing to assign a dipole moment to the vortex. The dipole moment is a sum of two terms, the first one is proportional to the relative flow velocity w and the second one isExperiments [1,2] carried out at ILT in Kharkov last 10 years revealed that a standing wave of second sound in He II was accompanied by appearance of electric potential of the order 7

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confidence: 55%

On the Dipole Moment of Quantized Vortices in the Presence of Flows

Shevchenko

Konstantinov

2016

J Low Temp Phys

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“…In this case, the time correlation function f ϕ (t) is such that the time integral (12) defining ϕ(ω) at any real frequencies ω converges [38]. From (14) and (15), it immediately follows that…”

Section: Cs Permittivity In the Presence Of Bec For Nucleimentioning

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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“…In addition, the isotropic nonpolar dielectric can polarize itself spontaneously. The spontaneous polarization related to the acceleration and the density gradient was theoretically studied, respectively, in [3,4,5,6,7,8] and [3,5,9,10,11,12]. The density gradient causes the spontaneous polarization, because two nonpolar atoms polarize each other [13,14,15].…”

Section: Introductionmentioning

confidence: 99%

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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On the electric activity of superfluid systems

Cited by 20 publications

References 14 publications

On the Dipole Moment of Quantized Vortices in the Presence of Flows

On the Dipole Moment of Quantized Vortices in the Presence of Flows

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

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

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