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Известия Самарского научного центра Российской академии наук

Динамика населенностей в двойных туннельно-связанных квантовых ямах с замкнутым контуром возбуждения

К. А. Баранцев, Андрей Николаевич Литвинов, Boris G. Matisov

Published Jan 1, 2012• 0 citations
OpenAlex

Abstract

The conditions of the dark resonance for interaction of the laser radiation with tunneling coupled quantum wells have been researched. The phase sensitive dependence of the dark resonances has been investigated. We obtained that destruction as well as restoration of the dark resonances is possible in dependence on the algebraic sum of the phases of exciting fields. It is shown that the phase variation of exciting fields influences on the absorption and dispersion of the probe field in a medium with quantum wells.

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The dark resonances in the case of the absorption of optical radiation in double tunneling-coupled quantum wells

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This work is devoted to the research of conditions of the dark resonance (coherent population trapping) of the interaction of the laser radiation with tunneling-coupled quantum wells. The phase sensitive dependence of dark resonances has been investigated. We obtained that destruction as well as restoration of the dark resonances of the coherent population trapping is possible in dependence on algebraic sum of the phases of exciting fields. It is shown that the phase variation of exciting fields influences on the absorption and dispersion of the probe field in a medium with quantum wells.

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In this paper, the radiation of a two-level resonant medium placed in a cavity and excited by a laser pulse with periodic phase modulation is studied theoretically. The analysis is carried out on the basis of an analytical and numerical solution of the system of Maxwell-Bloch equations under conditions when the regime of strong coupling of the field and matter is realized. Under these conditions, this system is similar to a polariton laser. A high excitation efficiency of a polariton laser by a phase-modulated radiation pulse compared with a pulse without phase modulation of the carrier frequency is shown. It is shown that the main reason for the effective excitation of polariton modes of the medium is the occurrence of a difference combination parametric resonance. The results obtained open up new possibilities in the excitation of radiation from polariton lasers by low-power pumping laser radiation with frequency modulation.

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Двумерная локализация атомных населенностей в четырехуровневых квантовых системах

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Abstr3ct. The paper deals with investigation of one aspect of fundamental problem of laser radiation interaction with the matter. This problem is spatial localization of atomic populations due to fields impact of few running waves. We are the first to propose in our work two-dimensional spatial localization of atomic populations in medium with tripod-like configuration of levels under the field influence of running waves only. Three running waves, propagating along one plane 120o angle-wise to each other, form the system of standing waves in this plane. Atomic populations can be localized in the field of these standing waves. Moreover, the degree of such localization can make up hundredth parts of the wavelength of the incident optical radiation. It is shown that an excitation of the central transition of the tripod-like system using a field of multidirectional linearly polarized running waves is the necessary condition of the population dependence from spatial coordinates in the XY plane. The two-dimensional shapes that appear in this system can have very complicated structure such as “double craters”.

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Короткие импульсы нормальных мод электромагнитно индуцированной прозрачности

Oleg M. Parshkov

AbstractThe process of propagation of short probe pulses of electromagnetically induced transparency has been analyzed theoretically in the case of elliptically polarized control radiation. As a model of a resonant medium, a Λ scheme of quantum transitions between the $$^{3}{{P}_{0}}$$ , $$^{3}P_{1}^{0}$$ , and $$^{3}{{P}_{2}}$$ degenerate levels of the ^208Pb isotope has been used. The situation in which the probe radiation is rather weak compared to the control radiation has been examined. In this case, the field of the probe pulse can be represented as a sum of the fields of two elliptically polarized pulses that propagate in the medium independently of one another without changing their polarization state, which makes it possible to interpret them as nonstationary normal modes. Numerical simulation has shown that the structure of normal modes depends on the ratio of the width of the spectrum of the input probe pulse to the Doppler frequency broadening of the quantum transition that is resonant to the probe field. If this ratio is small, each mode in the medium is a single pulse similar to the input probe pulse. Under these conditions, the propagation of each normal mode in the medium can be fairly well characterized by the group velocity depending on the intensity and the state of polarization of the control radiation. As this ratio increases, normal modes in the medium initially acquire the shape of a regular decaying train of pulses, and then their structure becomes chaotic. The described evolution is accompanied by an increase in the energy absorption of the probe radiation by the medium and by a significant deterioration in the applicability of the notion of group velocity for describing the propagation process of normal modes.

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Decoherence of an atomic condensate in a double-well trap at optical probing

L. V. Il’ichev, P. L. Chapovsky

A model of an atomic condensate in a double-well potential with the possibility of tunneling between wells has been considered. The process of tunneling is modified by the optical probing of one of the wells by a beam of nonresonance radiation. The phase of the passing beam is correlated with the number of atoms in the probed well; as a result, coherence between states with different numbers of atoms is partially destroyed. The solution of the initial quantum kinetic equation for the states of the condensate has been obtained under the assumption of the dominant role of such a decoherence. An expression has been obtained for the correlation function of the amplitude of radiation passing through the probed well. The opposite situation of a slow destruction of coherence as compared to the rate of tunneling has also been considered. The stationary distribution in the numbers of atoms in wells for a given number of atoms in the condensate is uniform in both cases.

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Tunneling Control of Optical Properties of a Quantum Well from Adjacent Quantum Well by Coherent Population Trapping Effect

К. А. Баранцев, A. N. Litvinov, Величко Елена Николаевна

The coherent population trapping eect in double tunnel-coupled quantum wells is analyzed.One of two quantum wells interacts with the two-frequency laser radiation and low-frequency eld, thus forming a closed contour of excitation.It is possible to control the excited level population in such a scheme of excitation by changing relative phases of the elds in the coherent population trapping state.The quantum well is bound to the other quantum well by tunnel coupling of the excited levels, therefore the population and optical properties of the other quantum well depend on the coherent population trapping state in the rst quantum well and can be controlled.

Acta Physica Polonica A•Nov 1, 2014•0 citations
The conditions of the dark resonance for interaction of the laser radiation with tunneling coupled quantum wells have been researched. The phase sensitive dependence of the dark resonances has been investigated. We obtained that destruction as well as restoration of the dark resonances is possible in dependence on the algebraic sum of the phases of exciting fields. It is shown that the phase variation of exciting fields influences on the absorption and dispersion of the probe field in a medium with quantum wells.
This work is devoted to the research of conditions of the dark resonance (coherent population trapping) of the interaction of the laser radiation with tunneling-coupled quantum wells. The phase sensitive dependence of dark resonances has been investigated. We obtained that destruction as well as restoration of the dark resonances of the coherent population trapping is possible in dependence on algebraic sum of the phases of exciting fields. It is shown that the phase variation of exciting fields influences on the absorption and dispersion of the probe field in a medium with quantum wells.
In this paper, the radiation of a two-level resonant medium placed in a cavity and excited by a laser pulse with periodic phase modulation is studied theoretically. The analysis is carried out on the basis of an analytical and numerical solution of the system of Maxwell-Bloch equations under conditions when the regime of strong coupling of the field and matter is realized. Under these conditions, this system is similar to a polariton laser. A high excitation efficiency of a polariton laser by a phase-modulated radiation pulse compared with a pulse without phase modulation of the carrier frequency is shown. It is shown that the main reason for the effective excitation of polariton modes of the medium is the occurrence of a difference combination parametric resonance. The results obtained open up new possibilities in the excitation of radiation from polariton lasers by low-power pumping laser radiation with frequency modulation.
Abstr3ct. The paper deals with investigation of one aspect of fundamental problem of laser radiation interaction with the matter. This problem is spatial localization of atomic populations due to fields impact of few running waves. We are the first to propose in our work two-dimensional spatial localization of atomic populations in medium with tripod-like configuration of levels under the field influence of running waves only. Three running waves, propagating along one plane 120o angle-wise to each other, form the system of standing waves in this plane. Atomic populations can be localized in the field of these standing waves. Moreover, the degree of such localization can make up hundredth parts of the wavelength of the incident optical radiation. It is shown that an excitation of the central transition of the tripod-like system using a field of multidirectional linearly polarized running waves is the necessary condition of the population dependence from spatial coordinates in the XY plane. The two-dimensional shapes that appear in this system can have very complicated structure such as “double craters”.
AbstractThe process of propagation of short probe pulses of electromagnetically induced transparency has been analyzed theoretically in the case of elliptically polarized control radiation. As a model of a resonant medium, a Λ scheme of quantum transitions between the 3P0^{3}{{P}_{0}}3P0​ , 3P10^{3}P_{1}^{0}3P10​ , and 3P2^{3}{{P}_{2}}3P2​ degenerate levels of the ^208Pb isotope has been used. The situation in which the probe radiation is rather weak compared to the control radiation has been examined. In this case, the field of the probe pulse can be represented as a sum of the fields of two elliptically polarized pulses that propagate in the medium independently of one another without changing their polarization state, which makes it possible to interpret them as nonstationary normal modes. Numerical simulation has shown that the structure of normal modes depends on the ratio of the width of the spectrum of the input probe pulse to the Doppler frequency broadening of the quantum transition that is resonant to the probe field. If this ratio is small, each mode in the medium is a single pulse similar to the input probe pulse. Under these conditions, the propagation of each normal mode in the medium can be fairly well characterized by the group velocity depending on the intensity and the state of polarization of the control radiation. As this ratio increases, normal modes in the medium initially acquire the shape of a regular decaying train of pulses, and then their structure becomes chaotic. The described evolution is accompanied by an increase in the energy absorption of the probe radiation by the medium and by a significant deterioration in the applicability of the notion of group velocity for describing the propagation process of normal modes.
A model of an atomic condensate in a double-well potential with the possibility of tunneling between wells has been considered. The process of tunneling is modified by the optical probing of one of the wells by a beam of nonresonance radiation. The phase of the passing beam is correlated with the number of atoms in the probed well; as a result, coherence between states with different numbers of atoms is partially destroyed. The solution of the initial quantum kinetic equation for the states of the condensate has been obtained under the assumption of the dominant role of such a decoherence. An expression has been obtained for the correlation function of the amplitude of radiation passing through the probed well. The opposite situation of a slow destruction of coherence as compared to the rate of tunneling has also been considered. The stationary distribution in the numbers of atoms in wells for a given number of atoms in the condensate is uniform in both cases.
The coherent population trapping eect in double tunnel-coupled quantum wells is analyzed.One of two quantum wells interacts with the two-frequency laser radiation and low-frequency eld, thus forming a closed contour of excitation.It is possible to control the excited level population in such a scheme of excitation by changing relative phases of the elds in the coherent population trapping state.The quantum well is bound to the other quantum well by tunnel coupling of the excited levels, therefore the population and optical properties of the other quantum well depend on the coherent population trapping state in the rst quantum well and can be controlled.