Exchange interaction between two different atoms at large distances

Andreev, E.A.

doi:10.1007/bf01209766

Cited by 17 publications

(9 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The Landau-Zener approach combined with the decay model was also applied [28] for the description of resonant quenching of ns and nd states of neon by the Ca(4s 2 ) atom resulting from the nonadiabatic transitions between the ionic and Rydberg-covalent terms of a quasimolecule. Using a similar approach [26,28] and the asymptotic model [39][40][41] for the ionic-covalent coupling, an analytical estimate relating the peak position, n max , in the n-dependence of the ionpair formation cross section and the anion binding energy, |ε|, has been derived [29]. It makes the physical meaning of the semiempirically obtained relationship [25] between the values of n max and |ε| clear.…”

Section: Introductionmentioning

confidence: 99%

Comparative studies of ion-pair formation and resonant quenching processes in collisions of Rydberg atoms with the alkaline-earth atoms

Нариц

Mironchuk

Лебедев

2013

J. Phys. B: At. Mol. Opt. Phys.

View full text Add to dashboard Cite

We report the results of comparative studies of ion-pair formation and quenching processes in collisions of Rydberg Li(nl) and Cs(nl) atoms with Ca(4s 2 ), Sr(5s 2 ) and Ba(6s 2 ) atoms possessing small electron affinities. Our consideration includes both the cases of selectively excited Rydberg nl-states with small orbital angular momentum (l n) and nearly circular states with l ∼ n − 1. Calculations of the electron-transfer processes are based on the semiclassical theory of nonadiabatic transitions and exact expression for the Rydberg-covalent-ionic coupling terms. Calculations of nonresonant quenching processes are carried out within the framework of the available theory of inelastic and quasielastic transitions between Rydberg-covalent states. The ion-pair formation and resonant quenching cross sections are shown to be significantly dependent not only on the principal quantum number n but also on the orbital angular momentum l and the binding energy of the alkaline-earth anion. For each system under study we find the regions of n in which either the resonant quenching or the ion-pair formation processes are predominant. The relative role of the resonant and nonresonant mechanisms of depopulation of Rydberg states is investigated.

show abstract

Section: Introductionmentioning

confidence: 99%

Comparative studies of ion-pair formation and resonant quenching processes in collisions of Rydberg atoms with the alkaline-earth atoms

Нариц

Mironchuk

Лебедев

2013

J. Phys. B: At. Mol. Opt. Phys.

View full text Add to dashboard Cite

show abstract

“…where s is the surface of integration; see Refs. [12,14,15,31] for more details. Note the wavefunctions Φ are here only the spatial components.…”

Section: A Surface Integral Methodsmentioning

confidence: 99%

“…The splitting ∆U is related to the interaction H ic = Φ i |H|Φ c in the (non-orthogonal) diabatic basis (e.g. [31,32])…”

Section: Theorymentioning

confidence: 99%

Correspondence between the surface integral and linear combination of atomic orbitals methods for ionic-covalent interactions in mutual neutralisation processes involving H$^-$/D$^-$

Barklem¹

2021

Preprint

View full text Add to dashboard Cite

“…Hence, regarding it as a localized impurity is justified. Na-Au exchange interaction: When the distance between a 22 Na atom and the 197 Au impurity is of the order of R 0 (the atomic size), there is an exchange interaction between their open electronic s shells [20]. It includes a direct exchange term of strength J d (due to antisymmetrization of the electronic wave functions where electrons do not hop between atoms), and an indirect exchange term of strength J p (due to contribution from polar states, where electrons can hope between atoms).…”

Section: Introductionmentioning

confidence: 99%

“…FIG.5: Direct exchange interaction V d (R) [Eq (19),. dashed purple curve], indirect exchange interaction Vp(R) [Eq (20),. dashed and dotted blue curve] and the total exchange interaction V (R) [Eq (23),.…”

mentioning

confidence: 99%

Model for overscreened Kondo effect in ultracold Fermi gas

Kuzmenko

Avishai

et al. 2015

Phys. Rev. B

View full text Add to dashboard Cite

The feasibility of realizing overscreened Kondo effect in ultra-cold Fermi gas of atoms with spin s ≥ 3 2 in the presence of a localized magnetic impurity atom is proved realistic. Specifying (as a mere example), to a system of ultra cold 22 Na Fermi gas and a trapped 197 Au impurity, the mechanism of exchange interaction between the Na and Au atoms is elucidated and the exchange constant is found to be positive (antiferromagnetic). The corresponding exchange Hamiltonian is derived, and the Kondo temperature is estimated at the order of 1 µK. Within a weak-coupling renormalization group scheme, it is shown that the coupling renormalizes to the non-Fermi liquid fixed point. An observable displaying multi-channel features even in the weak coupling regime is the impurity magnetization: For T ≫ TK it is negative, and then it increases to become positive with decreasing temperature.

show abstract

Exchange interaction between two different atoms at large distances

Cited by 17 publications

References 7 publications

Comparative studies of ion-pair formation and resonant quenching processes in collisions of Rydberg atoms with the alkaline-earth atoms

Comparative studies of ion-pair formation and resonant quenching processes in collisions of Rydberg atoms with the alkaline-earth atoms

Correspondence between the surface integral and linear combination of atomic orbitals methods for ionic-covalent interactions in mutual neutralisation processes involving H$^-$/D$^-$

Model for overscreened Kondo effect in ultracold Fermi gas

Contact Info

Product

Resources

About