New superatom in alkali-metal atoms

Pokutnyi, Sergey I.; Горбик, П. П.

doi:10.1007/s40097-014-0128-8

Cited by 3 publications

(2 citation statements)

References 7 publications

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“…1) [1][2][3][4][5][6]. The idea of a superatom (or artificial atom) was fruitful for the development of nanophysics [22,23]. A superatom (quasiatomic nanoheterostructures) consists of a spherical QD with radius a, the volume of which contains a semiconductor (or dielectric) material.…”

Section: Introductionmentioning

confidence: 99%

Exciton quasimolecules in nanosystems with semiconductor and dielectric colloidal quantum dots: a review

Pokytnyi

Terets

2022

Poverhn.

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In review, deals with the theory of exciton quasimolecules (formed of spatially separated electrons and holes) in a nanosystems that consists of semiconductor and dielectric colloidal quantum dots (QDs) synthesized in a dielectric and semiconductor matrixs. It has been shown that the exciton quasimolecule formation is of the threshold character and possible in a nanosystem, where the distance D between the surfaces of QD is given by the condition (where and are some critical distance). We have shown that in such a nanoheterostructures acting as “exciton molecules” are the QDs with excitons localizing over their surfaces. The position of the quasimolecule state energy band depends both on the mean radius of the QDs, and the distance between their surfaces, which enables one to purposefully control it by varying these parameters of the nanostructure. It was found that the binding energy of singlet ground state of exciton quasimolecules, consisting of two semiconductor and dielectric QDs is a significant large values, larger than the binding energy of the biexciton in a semiconductor and dielectric single crystals almost two orders of magnitude. It is shown that the major contribution to tue binding energy of singlet ground state of exciton quasimolecule is made by the energy of the exchange interaction of electrons with holes and this contribution is much more substantial than the contribution of the energy of the Coulomb interaction between the electrons and holes. It is established that the position of the exciton quasimolecule energy band depends both on the mean radius of the QDs and the distance between their surfaces. It is shown that with increase in temperature above the threshold (), a transition can occur from the exciton quasimolecule to exciton state. It has been found that at a constant concentration of excitons (i.e. constant concentration of QD) and temperatures Т below , one can expect a new luminescence band shifted from the exciton band by the value of the exciton quasimolecule binding energy. This new band disappears at higher temperatures (). At a constant temperature below , an increase in exciton concentration (i.e. in QD concentration) brings about weakening of the exciton luminescence band and strengthening of the exciton quasimolecule. These exciton quasimolecules are of fundamental interest as new quasi-atomic colloidal nanostructures; they may also have practical value as new nanomaterials for nanooptoelectronics. The fact that the energy of the ground state singlet exciton quasimolecule is in the infrared range of the spectrum, presumably, allow the use of a quasimolecule to create new infrared sensors in biomedical research.

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Section: Introductionmentioning

confidence: 99%

Exciton quasimolecules in nanosystems with semiconductor and dielectric colloidal quantum dots: a review

Pokytnyi

Terets

2022

Poverhn.

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“…Various researchers have shown that with the rise of the exciton binding energy value in low-dimensional semiconductor systems, the biexciton binding energy value with growth confinement is also raised [25,[57][58][59][60][61][62][63][64][65][66][67]. All of the papers in this field have shown that by improving the biexciton creation in reduced dimensional semiconductor structures, the quantum yield (QY) of photovoltaic cells has been enhanced [57,[68][69][70][71].…”

Section: Introductionmentioning

confidence: 99%

Recent Advancement on the Excitonic and Biexcitonic Properties of Low-Dimensional Semiconductors

Armăşelu¹

2020

Advances in Condensed-Matter and Materials Physics - Rudimentary Research to Topical Technology

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Knowing excitonic and biexcitonic properties of low-dimensional semiconductors systems is extremely important for the discovery of new physical effects and for the development of novel optoelectronics applications. This review work furnishes an interdisciplinary analysis of the fundamental features of excitons and biexcitons in two-dimensional semiconductor structures, one-dimensional semiconductor structures, and zero-dimensional (0D) semiconductor structures. There is a focus on spectral and dynamical properties of excitons and biexcitons in quantum dots (QDs). A study of the recent advances in the field is given, emphasizing the latest theoretical results and latest experimental methods for probing exciton and biexciton dynamics. This review presents an outlook on future applications of engineered multiexcitonic states including the photovoltaics, lasing, and the utilization of QDs in quantum technologies.

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Electron Properties of Nanodimensional Quasi-Atomic Structures

Pokutnyi

Горбик

2013

Usp. Fiz. Met.

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New superatom in alkali-metal atoms

Abstract: On the basis of a similarity with electronic states in alkali-metal atoms, the existence of a new artificial atom (superatom) has been predicted theoretically. This superatom may be considered as a new alkali-metal atom.

Cited by 3 publications

References 7 publications

Exciton quasimolecules in nanosystems with semiconductor and dielectric colloidal quantum dots: a review

Exciton quasimolecules in nanosystems with semiconductor and dielectric colloidal quantum dots: a review

Recent Advancement on the Excitonic and Biexcitonic Properties of Low-Dimensional Semiconductors

Electron Properties of Nanodimensional Quasi-Atomic Structures

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