Multipole expansion in plasmas: Effective interaction potentials between compound particles

Рамазанов, Т. С.; Moldabekov, Zhandos A.; Габдуллин, М. Т.

doi:10.1103/physreve.93.053204

Cited by 30 publications

(18 citation statements)

References 73 publications

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“…We must mention that in a number of works (e.g. see [34][35][36][37]) the attraction between like charged grains in transverse to ion flow direction has been predicted in dusty plasmas at normal condition considering the solution of the linearized kinetic and fluid equations. However, this prediction was not confirmed so far neither by experiment nor by more accurate PIC or molecular dynamics simulations.…”

Section: Discussionmentioning

confidence: 99%

Ultracold ions wake in dusty plasmas

Sundar

Moldabekov

2020

New J. Phys.

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Motivated by the recent experimental realization of ultracold dusty plasma (2019 Sci. Rep. 9 3261), we present the results of particle-in-cell simulation with Monte-Carlo-collisions for wake behind a dust particle due to focusing of ions at superfluid helium temperature (∼2 K). Dynamical screening (wakefield) defines structural and dynamical properties of charged dust particles in plasmas such as phase transition, crystal formation, vibration modes (waves) etc. Here, we delineate in detail the dependence of wake strength on the streaming velocity of ions and on the ion-neutral charge exchange collision frequency (neutrals density) in the ultracold dusty plasma. Lowering the temperature to ultracold level leads to a wake pattern behind a dust particle that completely differs from the wake at normal conditions. For wide range of parameters, most remarkable features of the wakefield are (i) the formation of wake pattern with two maxima split in transverse to ion flow direction in the downstream area, (ii) pronounced inverse V shape of the wakefield closely resembling the wake in quark-gluon plasma and dense quantum plasma (warm dense matter), and (iii) the inter-dust attraction region in transverse direction. The latter shows that molecule-like interaction between dust particles is realized in ultracold dusty plasmas. These observations show a fundamental difference of ultracold dusty plasma physics from well studied complex plasmas at normal conditions.

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Section: Discussionmentioning

confidence: 99%

Ultracold ions wake in dusty plasmas

Sundar

Moldabekov

2020

New J. Phys.

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“…Even for the limit of a completely isolated NO + and Rydberg electron, h i must account for electron orbital interactions with the rotational, vibrational and electronic degrees of freedom of the core ion, including in particular coupling to predissociative channels of irreversible decay to neutral products, N( 4 S) and O( 3 P) [43,44]. Extending h i to allow for excitonic binding adds considerable complexity [45,46]. But, nevertheless, we can expect its eigenstates to exhibit properties that vary smoothly as a function of binding energy [47], extending from a regime of isolated, central-field Rydberg molecules to one of Rydberg-like excitons.…”

Section: Experimental Evidence For a State Of Arrested Relaxationmentioning

confidence: 99%

Many-body physics with ultracold plasmas: quenched randomness and localization

Sous

Grant

2019

New J. Phys.

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The exploration of large-scale many-body phenomena in quantum materials has produced many important experimental discoveries, including novel states of entanglement, topology and quantum order as found for example in quantum spin ices, topological insulators and semimetals, complex magnets, and high-T c superconductors. Yet, the sheer scale of solid-state systems and the difficulty of exercising exacting control of their quantum mechanical degrees of freedom limit the pace of rational progress in advancing the properties of these and other materials. With extraordinary effort to counteract natural processes of dissipation, precisely engineered ultracold quantum simulators could point the way to exotic new materials. Here, we look instead to the quantum mechanical character of the arrested state formed by a quenched ultracold molecular plasma. This novel class of system arises spontaneously, without a deliberate engineering of interactions, and evolves naturally from statespecified initial conditions, to a long-lived final state of canonical density, in a process that conflicts with classical notions of plasma dissipation and neutral dissociation. We take information from experimental observations to develop a conceptual argument that attempts to explain this state of arrested relaxation in terms of a minimal phenomenological model of randomly interacting dipoles of random energies. This model of the plasma forms a starting point to describe its observed absence of relaxation in terms of many-body localization (MBL). The large number of accessible Rydberg and excitonic states gives rise to an unconventional web of many-body interactions that vastly exceeds the complexity of MBL in a conventional few-level scheme. This experimental platform thus opens an avenue for the coupling of dipoles in disordered environments that will demand the development of new theoretical tools.

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“…Making use of the method of multipole expansion, we obtain the following formula for the interaction of an atom with the electron in a quantum plasma:

Φ_{P} ((), R) = - \frac{\overset{α}{true} e^{2}}{2 {(R^{2} + r_{c}^{2})}^{2}} {[f_{2} (R)]}^{2},

where

\begin{matrix} f_{2} (R) = \frac{1}{(k_{i}^{2} + 1 / λ^{2}) \sqrt{1 - {((), 2 k_{D} false/ λ ((), k_{i}^{2} + 1 false/ λ^{2}))}^{2}}} [(\frac{1}{λ^{2}} - B^{2}) (1 + RB) \exp (- RB) \\ - (\frac{1}{λ^{2}} - A^{2}) (1 + RA) \exp (- RA)] . \end{matrix}

…”

Section: Optical Potential For E–h Scatteringmentioning

confidence: 99%

“…The screened polarization potential has the same form as the one derived in Ref. with the only difference that γ ≠ 0; that is, corrections due to electronic correlations are taken into account.…”

Section: Optical Potential For E–h Scatteringmentioning

confidence: 99%

Impact of quantum non‐locality and electronic non‐ideality on e–He scattering in a dense plasma

Рамазанов

Amirov

Moldabekov

2018

Contributions to Plasma Physics

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The screened Hartree–Fock potential and the polarization potential for the description of the electron–helium scattering in dense plasmas are derived. The effects of quantum non‐locality and correlations of free electrons are taken into account in the plasma dielectric function. Plasma polarization leads to a significant increase in the transport cross‐section at small wave numbers ka < 2 in comparison with the case of an electron scattering on the isolated atom, where a is the mean distance between plasma electrons. It is shown that taking into account the quantum non‐locality and correlations is important at ka < 2.

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Multipole expansion in plasmas: Effective interaction potentials between compound particles

Cited by 30 publications

References 73 publications

Ultracold ions wake in dusty plasmas

Ultracold ions wake in dusty plasmas

Many-body physics with ultracold plasmas: quenched randomness and localization

Impact of quantum non‐locality and electronic non‐ideality on e–He scattering in a dense plasma

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