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ФИЗИКА ЭЛЕМЕНТАРНЫХ ЧАСТИЦ И АТОМНОГО ЯДРА

Флуоресценция некогерентно возбуждаемой полярной квантовой системы, находящейся под воздействием сильного нерезонансного внешнего поля: Аннотации

Bogolyubov, Jr., N. N., Andrey Vladimirovich Soldatov, Н. Н. Боголюбов (мл.)

Published Mar 24, 2026• 0 citations
OpenAlex

Abstract

High-frequency fluorescent radiation by incoherently pumped polar two-level quantum system possessing permanent electric dipole moments and simultaneously interacting with external low-frequency field and dissipative environment of some kind was studied. The system in question may be represented by a one-electron two-level asymmetric polar semiconductor quantum dot characterized by the electric dipole moment operator with unequal diagonal matrix elements in its ground and excited quantum states. An analytical expression for the steady-state fluorescence spectrum as a function of the amplitude, initial phase and carrier frequency of the driving field, as well as of the pumping intensity, was derived. It was shown that in the case of strong external field an interaction with the environment is modified, which alters in its turn the fluorescence spectrum.

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High-frequency fluorescent radiation by incoherently pumped polar two-level quantum system possessing permanent electric dipole moments and simultaneously interacting with external low-frequency field and dissipative environment of some kind was studied. The system in question may be represented by a one-electron two-level asymmetric polar semiconductor quantum dot characterized by the electric dipole moment operator with unequal diagonal matrix elements in its ground and excited quantum states. An analytical expression for the steady-state fluorescence spectrum as a function of the amplitude, initial phase and carrier frequency of the driving field, as well as of the pumping intensity, was derived. It was shown that in the case of strong external field an interaction with the environment is modified, which alters in its turn the fluorescence spectrum.
Abstract High-frequency fluorescent radiation by incoherently pumped polar two-level quantum system possessing permanent electric dipole moments and simultaneously interacting with external low-frequency field and dissipative environment of some kind was studied. The system in question may be represented by a one-electron two-level asymmetric polar semiconductor quantum dot characterized by the electric dipole moment operator with unequal diagonal matrix elements in its ground and excited quantum states. An analytical expression for the steady-state fluorescence spectrum as a function of the amplitude, initial phase and carrier frequency of the driving field, as well as of the pumping intensity, was derived. It was shown that in the case of strong external field an interaction with the environment is modified, which modification alters in its turn the fluorescence spectrum.
Abstract The process of high-frequency fluorescence of a two-level open quantum system with permanent electric dipole moment interacting with a pulse of nonresonant monochromatic electromagnetic (laser) field is modeled and studied by methods of nonequilibrium quantum statistical mechanics. The system in question is represented by a one-electron two-level asymmetric polar semiconductor quantum dot characterized by the electric dipole moment operator with unequal diagonal matrix elements in its ground and excited quantum states, and interacting with dissipative environment. The dot is permanently excited by incoherent pumping and is driven by an amplitude modulated pulse, whose monochromatic carrier frequency is much lower than the optical transition frequency of the quantum dot. We derive an analytical expression for the time-dependent fluorescence power spectrum as a function of the amplitude, duration, initial phase, and carrier frequency of the rectangular monochromatic driving pulse, as well as of the pumping intensity and observation time. We show that the pulse itself does not add any discernable amount of energy to the fluorescence intensity but rather facilitates redistribution of the energy incoherently pumped into the system over a plurality of spectral peaks that arise under the influence of the pulse instead of the initial stationary single-peaked fluorescence spectrum observed before the arrival of the pulse and after its departure.
Abstract We studied spectral properties of high-frequency fluorescent radiation from a two-level quantum system with broken inversion spatial symmetry, which can be implemented as a model of a one-electron two-level asymmetric polar semiconductor quantum dot whose electric dipole moment operator has permanent unequal diagonal matrix elements. The case of the excitation of this system by incoherent pumping of some sort supplemented with an additional driving monochromatic field, which frequency is much lower than the optical transition frequency of the quantum dot, was considered. An analytical expression for the fluorescence spectrum as a function of the amplitude and frequency of the monochromatic driving field, as well as of the pumping intensity, was derived. We also discussed feasible practical applications of the effects under study in the field of quantum optics and optoelectronics for the generation of high-frequency radiation, possessing stationary equidistant spectrum, and for the control of the radiative properties of such nanodevices as spasers (dipole nanolasers).
We studied time-dependent features of high-frequency fluorescent radiation from a two-level quantum system with broken inversion spatial symmetry. The system in question was modelled after a one-electron two-level asymmetric polar semiconductor quantum dot whose electric dipole moment operator has permanent unequal diagonal matrix elements. The dot was permanently excited by incoherent pumping of some sort. Our attention was focused on the evolution of the fluorescence spectrum following abrupt switching on of an additional driving monochromatic field, which frequency is much lower than the optical transition frequency of the quantum dot. An analytical expression for the fluorescence spectrum as a function of the amplitude, initial phase and frequency of the monochromatic driving field, as well as of the pumping intensity and the elapsed time, was derived.
The fluorescent radiative properties of a two-level quantum polar system with broken spatial inversion symmetry being realized as a model of a single-electron two-level “atom” with permanent atomic electric dipole moment, so that its electric dipole operator diagonal matrix elements are not equal to each other, were examined. In practice, such a system can be realized as an asymmetric quantum dot. A particular case when this system is driven by a trichromatic external field, with two high-frequency bichromatic field components of equal Rabi frequencies and carrier frequencies being placed symmetrically around the atomic transition frequency, and one more low-frequency component being in resonance with the Rabi frequency of the high-frequency components, was analyzed. It was shown that the high-frequency spectral properties of the fluorescent radiation can be altered with equal efficiency either by controlling the intensity of the low-frequency component of the trichromatic driving field or by changing the degree of the quantum dot asymmetry. Possible options to apply this potentially use
Abstract The fluorescent radiative properties of a two-level quantum polar system with broken spatial inversion symmetry being realized as a model of a single-electron two-level “atom” with permanent atomic electric dipole moment, so that its electric dipole operator diagonal matrix elements are not equal to each other, were examined. In practice, such a system can be realized as an asymmetric quantum dot. A particular case when this system is driven by a trichromatic external field, with two high-frequency bichromatic field components of equal Rabi frequencies and carrier frequencies being placed symmetrically around the atomic transition frequency, and one more low-frequency component being in resonance with the Rabi frequency of the high-frequency components, was analyzed. It was shown that the high-frequency spectral properties of the fluorescent radiation can be altered with equal efficiency either by controlling the intensity of the low-frequency component of the trichromatic driving field or by changing the degree of the quantum dot asymmetry. Possible options to apply this potentially useful effect for practical purposes in the field of optoelectronics are also discussed.