Pairing of vibronic small excitons due to enhanced polarizability in a crystalline polarizable nonmetallic medium

Georgiev, M.; Singh, Jagtar

doi:10.1103/physrevb.58.15595

Cited by 2 publications

(7 citation statements)

References 15 publications

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“…We also study the structure formation in a 0.75-0.80 ML range where a succession of unidimensional p(n × 1), n = 4, 8, 13, 17, 5, structures were experimentally observed. Including coveragedependent interactions [24,38] in the model, we obtained Pb/Cu(110) interface properties in close agreement with recent TEAS and STM experimental findings.…”

Section: Introductionsupporting

confidence: 86%

“…Using the same correction in the Pb-Pb-atom interaction potential, i.e. decreasing the value of the hopping integral ξ in the band-energy term (3), by 25% of the value appropriate for the bulk Pb crystal [24], we could observe at around 0.4 ML slight demixing and formation of the first islands of the c(2 × 2) Pb phase.…”

Section: Lattice-gas Formation and Transition To The C(2 × 2) Phasementioning

confidence: 98%

“…We point out that if we use the bulk parameters in the interaction potentials, the system cannot generate the experimentally observed emerging c(2 × 2) structure at ∼0.4 ML coverage and even at its saturation coverage of 0.5 ML. It has been shown that using coveragedependent interaction potentials it is possible to obtain a stable c(2 × 2) Pb structure on a Cu(110) surface [24]. The order-disorder transition that the c(2 × 2) phase undergoes was studied in detail [24] in the framework of the same TB model as is presented here.…”

Section: Lattice-gas Formation and Transition To The C(2 × 2) Phasementioning

confidence: 99%

“…It has been shown that using coveragedependent interaction potentials it is possible to obtain a stable c(2 × 2) Pb structure on a Cu(110) surface [24]. The order-disorder transition that the c(2 × 2) phase undergoes was studied in detail [24] in the framework of the same TB model as is presented here. Depending on the kinds of defects, this transition was found to be 'first order' or of the continuous Ising type [39,41,42].…”

Section: Lattice-gas Formation and Transition To The C(2 × 2) Phasementioning

confidence: 99%

“…In the present paper, we study the equilibrium properties of a three-dimensional (3D) continuum-space model of Pb on the Cu(110) substrate applying standard Monte Carlo (MC) sampling and TB energy calculations [15,24]. We show that surface alloying is an equilibrium phenomenon even in the case of volume-immiscible systems.…”

Section: Introductionmentioning

confidence: 98%

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Monte Carlo simulations of the interface layer in Pb/Cu(110); a tight-binding-model calculation

Michailov

Georgiev

1999

J. Phys.: Condens. Matter

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Monte Carlo simulations with energies computed via the tight-binding model are applied in studying the equilibrium properties of the interface layer in the system Pb/Cu(110). In a submonolayer range below 0.5 ML (ML monolayer), the model based on the coverage-dependent interactions reveals a lattice-gas random adsorption, an equilibrium adatom-substrate intermixing and formation of a centred c(2 × 2) phase. The process of intermixing is found to be coverage and temperature dependent. At high adatom concentration, 0.75-0.80 ML, as a result of very subtle competition between the strain energy and the energy gain due to mixing, the system forms a succession of commensurate unidimensional p(n × 1) structures. The results are in line with those recently obtained from scanning tunnelling microscopy and thermal energy atom scattering observations.

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Section: Introductionsupporting

confidence: 86%

Section: Lattice-gas Formation and Transition To The C(2 × 2) Phasementioning

confidence: 98%

Section: Lattice-gas Formation and Transition To The C(2 × 2) Phasementioning

confidence: 99%

Section: Lattice-gas Formation and Transition To The C(2 × 2) Phasementioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

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Monte Carlo simulations of the interface layer in Pb/Cu(110); a tight-binding-model calculation

Michailov

Georgiev

1999

J. Phys.: Condens. Matter

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Akhter

Jin

2001

J. Phys.: Condens. Matter

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The melting behaviour of Pb film embedded in an Al matrix has been investigated by a molecular dynamics simulation technique. The Sutton-Chen potential for alloys has been employed to perform these calculations. Melting of a Pb(110) film has been studied by embedding it in Al(110) and Al(111). Melting is found to initiate at the film-host interface for the Al(110) host. However, a change in orientation of the film is observed before superheating when the film is embedded in the Al(111) matrix. The superheating determined by simulation is comparable with the value calculated by homogeneous theory.

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Pairing of vibronic small excitons due to enhanced polarizability in a crystalline polarizable nonmetallic medium

Cited by 2 publications

References 15 publications

Monte Carlo simulations of the interface layer in Pb/Cu(110); a tight-binding-model calculation

Monte Carlo simulations of the interface layer in Pb/Cu(110); a tight-binding-model calculation

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