Electron-hole exchange interaction in a biexciton molecule

Ungier, W.

doi:10.1016/0038-1098(89)90025-2

Cited by 12 publications

(8 citation statements)

References 11 publications

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“…Biexcitons, that is, bound states of two excitons, have been extensively studied in the literature both theoretically and experimentally in various materials and under different conditions [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15]. In particular, the study of the optical properties of excitons and biexcitons has received much attention in recent years, first in order to understand the underlying physics, and later towards possible new applications [16][17][18][19][20][21][22][23][24][25][26][27].…”

Section: Introductionmentioning

confidence: 99%

Explaining observed stability of excitons in highly excited CdSe nanoplatelets

et al. 2019

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We present the phase diagram of free charges (electrons and holes), excitons, and biexcitons in highly excited CdSe nanoplatelets that predicts a crossover to a biexciton-dominated region at easily attainable low temperatures or high photoexcitation densities. Our findings extend previous work describing only free charges and excitons by introducing biexcitons into the equation of state, while keeping the exciton and biexciton binding energies constant in view of the relatively low density of free charges in this material. Our predictions are experimentally testable in the near future and offer the prospect of creating a quantum degenerate, and possibly even superfluid, biexciton gas. Furthermore, we also provide simple expressions giving analytical insight into the regimes of photoexcitation densities and temperatures in which excitons and biexcitons dominate the response of the nanoplatelets.

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Section: Introductionmentioning

confidence: 99%

Explaining observed stability of excitons in highly excited CdSe nanoplatelets

et al. 2019

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“…We note that in the case of CdS and ZnS (crystals of wurtzite stucture) the ratio b_ _/b++ is of about 20% [2].…”

Section: Numerical Results and Discussionmentioning

confidence: 77%

“…In the simple band model, which was formerly considered by the author [1,2] and by Hayashi [3], the biexciton binding energy obtained with the trial wave function (40) is EB = 28 meV.…”

Section: Numerical Results and Discussionmentioning

confidence: 99%

“…The electron-hole exchange interaction mixes states of opposite parity therefore the states of the biexciton have no defined parity under separate permutation of the spatial, as well as, the spin coordinates of identical particles, two electrons and two holes, respectively. It was shown by Ungier [1,2] and Hayashi [3] in the previous papers that the ground state of the biexciton should be described by twocomponent spatial envelope function, symmetric and antisymmetric, but not by a symmetric wave function only, as in the case of hydrogen molecule. The previous papers refer to the simple band model neglecting the spin-orbit interaction in semiconductor.…”

Section: Introductionmentioning

confidence: 99%

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Excitonic Molecule in CuCl Crystal

Ungier

1993

Acta Phys. Pol. A

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The electronic structure of a biexciton is discussed while taking into account the detailed band structure of CuCl. The fine structure of the excitonic molecule is clarified with the effective electron-hole exchange effect taken into account beyond the effective mass approximation. The electron-hole exchange interaction mixes the states of opposite parities with respect to the permutation of electrons and holes. Two trial envelope functions, symmetric and antisymmetric under the permutation of two electrons or two holes, were used in the numerical minimization of the ground state energy of the biexciton. The obtained binding energy of the biexciton, as well as, the ratio of the mixing of the trial envelope functions of opposite parities are presented.

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“…The electron-hole exchange interaction mixes two singlet states of opposite parity, therefore the ground state of the biexciton has no definite parity under separate permutation of the spatial and the spin coordinates of identical particles, two electrons and two holes, respectively. It was shown by Ungier [1,2] and Hayashi [3] in previous papers that in the simple band structure (without total angular momentum classification according to spin-orbit interaction) the ground state of the biexciton should be described by a two component, symmetric and antisymmetric, spatial envelope function, but not only the symmetric one.…”

Section: Introductionmentioning

confidence: 99%

Excitonic Molecule in Wurtzite Crystals

1994

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We calculate with the variational technique the fine structure of a biexciton in wurtzite crystals with the effective electron-hole exchange interaction taken into account. The values of the electron-hole exchange integrals are taken from the free exciton Γ5-Γ6 splitting. We calculate the biexciton dissociation energy and the ratio of mixing of the symmetric and antisymmetric envelopes which arises from the electron-hole exchange interaction. Results are presented for CdS, CdSe and ZnS crystals.

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Electron-hole exchange interaction in a biexciton molecule

Cited by 12 publications

References 11 publications

Explaining observed stability of excitons in highly excited CdSe nanoplatelets

Explaining observed stability of excitons in highly excited CdSe nanoplatelets

Excitonic Molecule in CuCl Crystal

Excitonic Molecule in Wurtzite Crystals

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