Electric Induction in He II

Rybalko, A. S.; Rudavskiı̆, É. Ya.; Rubets, S. P.; Tikhiy, V. A.; Деркач, В. Н.; Tarapov, S. I.

doi:10.1007/s10909-007-9448-0

Cited by 27 publications

(38 citation statements)

References 4 publications

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“…The character of the electromagnetic wave absorption is strongly dependent on the velocity of the superfluid flow V s . This was demonstrated in special experiments [23] in which V s was varied using devices similar to Kapitza's "hydrodynamic guns" [24]. The V s and V n flows were generated with a heater.…”

Section: Kinetics Of the Signal Amplitude Variationmentioning

confidence: 99%

“…The impact of the directed superfluid flows on the electromagnetic wave absorption will be discussed comprehensively in a special paper (see Ref. [23] for brief information and results). Note that the superfluid flow suppresses significantly the Q-factor at all modes, which is indicative of additional dissipation.…”

Section: Kinetics Of the Signal Amplitude Variationmentioning

confidence: 99%

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Resonance Microwave Absorption in He II

et al. 2007

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Section: Kinetics Of the Signal Amplitude Variationmentioning

confidence: 99%

Section: Kinetics Of the Signal Amplitude Variationmentioning

confidence: 99%

Resonance Microwave Absorption in He II

et al. 2007

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“…The most impressive thing is detection of a certain low-frequency mode of 180.3  GHz which behaves like specific eigenstate of superfluid flow in 4 He [7,8]. This mode can be splitted by an external stationary and uniform electric field, and such a splitting increases linearly with applied field [7,8].…”

Section: Introductionmentioning

confidence: 99%

“…Unusual response of superfluid helium under external electromagnetic exposure is a subject of intensive discussions over last decade [1][2][3][4][5][6][7][8]. The most impressive thing is detection of a certain low-frequency mode of 180.3  GHz which behaves like specific eigenstate of superfluid flow in 4 He [7,8].…”

Section: Introductionmentioning

confidence: 99%

“…r r r r (34) In the case of spinless 4 He nucleus it should completed by the triplet spin function [37], and it has to be nominated as the u u − + r r r r (35) The most impressive result is that the next on the energy scale is spatially antisymmetric triplet . Lower state is doubly degenerated, but in reality it is slightly splitted and the distance between upper and lower sublevels is higher due to spin-orbital interaction [50].…”

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Helium atom in an external electric field: Exact diagonalization

Antsygina

Chishko

2014

Low Temperature Physics

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An exact diagonalization method is applied to solve the quantum-mechanical problem of spinless helium atom in an external electric field of arbitrary magnitude. The basis set for two-electron problem is built from different pair combinations ψ nalama (αr a )ψ nblbmb (αr b ) of orthonormalized single-particle hydrogen-like wave functions ψ nml (r) belonging to any possibly bound states of the individual a-and b-electrons in the Coulomb central field renormalized by the scale parameter α > 0. Within the selected basis the matrix elements of the total Hamiltonian allows an exact analytical representation in the form of finite numerical sums. The diagonalization procedure is performed by Jacobi algorithm for N×N square Hermitian matrix built on the basis of dimension N = 25. The systematics and the numerical values of the low-lying energy levels at zero field are in good agreement with known experimental data. The field dependences of low-lying levels (Stark effect) and polarizability in the ground state of helium atom are presented. It is shown that even extremely high external fields lead only to shifting or splitting of existing low levels, without disturbance of their systematics. Typically, no new lowenergy excitation can be created under external electric field of moderate intensity. Radical reconstruction in spectrum of individual helium atoms can be expected in condensed helium phases where each atom is deeply affected by interaction fields from neighbors. This result should be taken into account at interpretation of electrodynamic experiments on superfluid helium. PACS: 31.15.ac High-precision calculations for few-electron (or few-body) atomic systems.

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