Academic literature on the topic 'Spherical quantum dots'
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Journal articles on the topic "Spherical quantum dots"
Kaputkina, N. E., and Yu E. Lozovik. "“Spherical” quantum dots." Physics of the Solid State 40, no. 11 (November 1998): 1935–36. http://dx.doi.org/10.1134/1.1130690.
Full textFomin, V. M., V. N. Gladilin, J. T. Devreese, E. P. Pokatilov, S. N. Balaban, and S. N. Klimin. "Photoluminescence of spherical quantum dots." Physical Review B 57, no. 4 (January 15, 1998): 2415–25. http://dx.doi.org/10.1103/physrevb.57.2415.
Full textHarry, S. T., and M. A. Adekanmbi. "CONFINEMENT ENERGY OF QUANTUM DOTS AND THE BRUS EQUATION." International Journal of Research -GRANTHAALAYAH 8, no. 11 (December 16, 2020): 318–23. http://dx.doi.org/10.29121/granthaalayah.v8.i11.2020.2451.
Full textJia, Rui, De-Sheng Jiang, Ping-Heng Tan, and Bao-Quan Sun. "Quantum dots in glass spherical microcavity." Applied Physics Letters 79, no. 2 (July 9, 2001): 153–55. http://dx.doi.org/10.1063/1.1380732.
Full textCasado, E., and C. Trallero-giner. "Electrooptical constants in spherical quantum dots." physica status solidi (b) 196, no. 2 (August 1, 1996): 335–46. http://dx.doi.org/10.1002/pssb.2221960208.
Full textZhu, Jia-Lin, Jie-Hua Zhao, Wen-Hui Duan, and Bing-Lin Gu. "D−centers in spherical quantum dots." Physical Review B 46, no. 12 (September 15, 1992): 7546–50. http://dx.doi.org/10.1103/physrevb.46.7546.
Full textThao, Dinh Nhu, and Le Thi Ngoc Bao. "Quantum beat of excitons in spherical semiconductor quantum dots." Superlattices and Microstructures 146 (October 2020): 106675. http://dx.doi.org/10.1016/j.spmi.2020.106675.
Full textFai, Teboul, Monteil, and Maabou. "POLARON IN CYLINDRICAL AND SPHERICAL QUANTUM DOTS." Condensed Matter Physics 7, no. 1 (2004): 157. http://dx.doi.org/10.5488/cmp.7.1.157.
Full textGaragiola, Mariano, and Omar Osenda. "Excitonic states in spherical layered quantum dots." Physica E: Low-dimensional Systems and Nanostructures 116 (February 2020): 113755. http://dx.doi.org/10.1016/j.physe.2019.113755.
Full textMarín, J. L., R. Riera, and S. A. Cruz. "Confinement of excitons in spherical quantum dots." Journal of Physics: Condensed Matter 10, no. 6 (February 16, 1998): 1349–61. http://dx.doi.org/10.1088/0953-8984/10/6/017.
Full textDissertations / Theses on the topic "Spherical quantum dots"
Kimani, Peter Borgia Ndungu. "Electronic structure and electron correlation in weakly confining spherical quantum dot potentials." abstract and full text PDF (free order & download UNR users only), 2008. http://0-gateway.proquest.com.innopac.library.unr.edu/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:3307466.
Full textSushko, O. A., О. М. Bilash, and M. M. Rozhitskii. "Nanophotonic method and sensor for polycyclic aromatic hydrocarbons detection." Thesis, ECL 2014, 2014. http://openarchive.nure.ua/handle/document/8963.
Full textKorolev, N. V., S. E. Starodubtcev, P. A. Meleshenko, and A. F. Klinskikh. "On the Theory of Exciton States Polarizability in Open Spherical Quantum Dot." Thesis, Sumy State University, 2012. http://essuir.sumdu.edu.ua/handle/123456789/34958.
Full textMelnikov, Dmitriy V. "Properties of a polaron confined in a spherical quantum dot /." Diss., 2001. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:3010417.
Full textming, yen hung, and 顏弘洺. "THE SIZE OF SPHERICAL Si QUANTUM DOTS STUDIED BY RAMAN SCATTERING." Thesis, 2002. http://ndltd.ncl.edu.tw/handle/45329727584191762440.
Full text國立臺灣師範大學
物理研究所
90
THE SIZE OF SPHERICAL Si QUANTUM DOTS STUDIED BY RAMAN SCATTERING Spherical Silicon quantum dots which have been grown by thermal evaporation method were examined by Raman scattering, TEM and optical reflectivity measurements. The TEM pattern reveals the size of quantum dots at different growth condition. The Raman spectra have shown the correlation of phonon energy and dots size. The comparison of size obtained from TEM and Raman measurement has shown consistent, therefore, we found the size of silicon quantum dots size can be measured from sample's Raman spectra , and the different pattern related to the different growth condition, similarly to the dot size. We also got the relationship between sample growth pressure and its Raman spectra.
Esfandiarpour, Behzad. "Integration of Nanostructures and Quantum Dots into Spherical Silicon Solar Cells." Thesis, 2013. http://hdl.handle.net/10012/7926.
Full textWeng, Chih-Li, and 翁誌勵. "Electronic Structures and Phonon Properties of Spherical Semiconductor Quantum-Dot Quantum Wells." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/58925679999921978139.
Full text國立中正大學
物理所
97
In this Thesis, the envelope functions of electrons and holes in the spherical semiconductor quantum dots (QDs), core/shell nanocrystals, and quantum-dot quantum wells (QDQWs) are obtained analytically by the single-band effective-mass approximation. Moreover, the vibrational modes of acoustic phonons and the corresponding eigenfrequencies in these nanostructures are obtained by adopting their corresponding continuum models. In addition to the analytic results of the vibrational modes in the nanocrystals, the numerical solutions of the energy spectra of the phonons are obtained by using the Finite-Element Method (FEM). According to the analytic solutions of electrons or holes, and eigenmodes of phonons, the energy shifts from the electron(hole)-acoustic-phonon interaction are calculated by the perturbation theory. The dependence of the ground state and the rst excited state energy shifts of carriers in the core/shell nanocrystal and QDQW on the nanostructure is investigated. We found that the parameter, absolute volume deformation potential (AVDP), and the localization of carriers are two decisive factors in calculating the values of energy shifts. On the other hand, the elementary electronic excitation spectra of the semiconductor nanostructures must be included in the investigation to the electronic structures. The dynamic dielectric function of a spherical semiconductor quantum dot (QD) is also derived analytically within the framework of the effective-mass and Bohm-Pines'' random-phase approximations. The computational schemes are developed to investigate the single-particle-like charge-density excitations (SP-like CDEs) in charged spherical QDs, which are observed in the resonant Raman scattering. The formulism in this study is established in terms of the real-space representation, which is suitable for zero-dimensional systems. This Thesis investigates the energy of the SP-like CDE with the angular quantum number l, and discusses the relation between this excitation and the single-particle excitation (SPE) energies. The selection rules of angular quantum numbers l play the important role in determining the SP-like CDE energies, and the calculated results are consistent with measurements. This Thesis also presents the dependence of the energy shift of the SP-like CDE with respect to the SPE on the size of a QD. The calculated results imply that SP-like CDEs will disappear in the limit of a QD with an infinite large radius. The dependence of the energy shift on the relative permittivity is also discussed.
Chang, Shih-Hsin, and 張世欣. "Eigenstates and Fine Structure of a Hydrogenic Impurity in a Spherical Quantum Dot." Thesis, 1998. http://ndltd.ncl.edu.tw/handle/15469733204465864210.
Full text國立彰化師範大學
科學教育研究所
86
A new simpler exact solution and the fine-structure of the energy levels for ahydrogenic impurity located in the center of a spherical quantum dot is calculated. The results reveal that when the dot radius approaches to zero, the eigenenergies are just like a free-space hydrogenic atom. When the dot radius is large enough, then the eigenenergies approach to a free-space hydrogenic atom but are shifted by the confining potential. Also we find that the radial expectation values will be equal to a free-space hydrogenic atom, when the dot radius is extremely small and extremely large. Between these two situations, the radial expectation values are smaller than a free-space one's because of the pressing of the confining potential. Not every dot radius influences the eigenenergy to the same degree. It's decided by the bumps of the electron's wave function and the place of the potential well's margin. When the margin of the well begins to push the bumps of the wave then the eigenenergy will increase more quickly. Because of the changing of the electron distribution probability, the degeneracy of the different L-value in a free-space hydrogenic atom is removedby the confining potential. The total energy shifts of the fine structure of the impurity could be six times larger than the total energy shifts of a free-space atom.
I-Chuen, Chen, and 陳貽春. "SPECIFIC HEAT AND LOW-FREQUENCY RAMAN SCATTERING FROM ACOUSTIC VIBRATIONS OF SPHERICAL SEMICONDUCTOR QUANTUM-DOT." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/94233017134970659785.
Full text國立中正大學
物理系
99
In the first part of this thesis, I will present a study of the vibrational modes of acoustic phonons and their corresponding eigenfrequencies in CdS/CdSe/CdS quantum-dot quantum wells (QDQWs) obtained on the continuum model. The energy spectra of the phonons in nanocrystals from the analytic solutions are checked by the Finite- Element Method (FEM). Based on the spectrum of acoustic phonons and the Debye model, the temperature dependences of the specific heat contributed from lattice phonons are calculated to investigate their size-dependent effects. Lattice softening is also demonstrated and the results qualitatively agree with the experimental observations for fine particles and quantum dots. We found that the phonon density of states of a QDQW is important for calculating specific heat, and, perhaps, also for modifying the effective sound velocity in the nanocrystal. In the second part of the thesis, I will describe an investigation of the Raman light-to-vibration coupling coefficients Cαβ of the l=0 and the l=2 spheroidal phonon modes of quasi-free spherical CdSe/CdS core/shell nanoparticles calculated. Based on the Lamb model, the displacement vectors of acoustic phonon modes are obtained and the Cαβ is also derived. The Raman scattering from quasi-free CdSe/CdS nanoparticles with various inner radii is investigated. For the l=0 acoustic modes, the bond polarizability model is adopted to calculate Cαβ, whose peak positions shift toward lower frequencies with the increase of the inner radius. This could be accounted for by the decrease of the averaged longitudinal and transverse sound velocities. Moreover, the ratio of the coefficients Aαβγδ [Montagna and Dusi, Phys. Rev. B 52, 10080 (1995)] between layers characterizes behaviors of peak heights of Cαβ. For the l=2 modes based on the dipole-induced-dipole model, the behaviors of peak positions are obtained by varying the values of vL and vT of materials in both layers. Because we treat the core/shell nanoparticle as a whole, the behavior of Cαβ peak positions on a CdSe/CdS core/shell nanoparticle is consistent with its dependence on the averaged sound velocities of the whole nanoparticle. At the same time, it also agrees with the calculated results for a CdSxSe1¡x nanoparticle [Risti´c et al., J. Appl. Phys. 104, 073519 (2008)]. However, we observed that some peaks reach dramatically high values for given inner radii of the CdSe/CdS nanoparticles, which occur only in spherical core/shell nanoparticles.
Liu, Te-Kuang, and 劉得光. "Ground State Energy of an Impurity Located at the Center of a Multi-Layer Spherical Quantum Dot." Thesis, 1999. http://ndltd.ncl.edu.tw/handle/65953817050387662651.
Full text國立交通大學
物理研究所
87
The ground state energy of an impurity located at the center of a multi-layer spherical quantum dot (MLSQD) is studied within the framework of effective mass approximation. It is found the material properties and geometric parameters would influence the ground state energy prominently. By solving the Schroedinger's equation analytically, the eigen-state energies can be obtained and the corresponding wave functions can be expressed in terms of Hypergeometric functions. The numerical results shows that by varying the materials in different layer and the geometry of the dot, the potentials and the ground state energies will be influenced deeply. To a bound state problem, the ground state energy directly relates to the thickness of the layer where the electron can stay steadily. The narrower the layer, the lower the ground state energies. On the contrary, quantum tunneling effect would occur if the potential can not allow any bound state to exist.
Book chapters on the topic "Spherical quantum dots"
Stebe, B., J. C. Marini, and E. Kartheuser. "Exciton-Phonon Coupling in Spherical Semiconductor Quantum Dots in the Adiabatic Approximation." In Phonons in Semiconductor Nanostructures, 373–81. Dordrecht: Springer Netherlands, 1993. http://dx.doi.org/10.1007/978-94-011-1683-1_36.
Full textNomura, Wataru, Takashi Yatsui, and Motoichi Ohtsu. "Properties of Optical Near-Field Excitation Transfers in Randomly Distributed Spherical Quantum Dots." In Handbook of Nano-Optics and Nanophotonics, 643–70. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-31066-9_17.
Full textFai, Lukong Cornelius. "Polaronic Kinetics in a Spherical Quantum Dot." In Feynman Path Integrals in Quantum Mechanics and Statistical Physics, 351–64. Boca Raton : CRC Press, 2021.: CRC Press, 2021. http://dx.doi.org/10.1201/9781003145554-20.
Full textFai, Lukong Cornelius. "Multiphoton Absorption by Polarons in a Spherical Quantum Dot." In Feynman Path Integrals in Quantum Mechanics and Statistical Physics, 337–50. Boca Raton : CRC Press, 2021.: CRC Press, 2021. http://dx.doi.org/10.1201/9781003145554-19.
Full text"Appendix A: Valence Band States for Spherical Confinement." In Spins in Optically Active Quantum Dots, 183–85. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2010. http://dx.doi.org/10.1002/9783527628988.app1.
Full textMorello, Giovanni. "Optical Properties of Spherical Colloidal Nanocrystals." In Fingerprints in the Optical and Transport Properties of Quantum Dots. InTech, 2012. http://dx.doi.org/10.5772/35733.
Full textLin, C. Y., and Y. K. Ho. "Photoionization Cross Sections of Atomic Impurities in Spherical Quantum Dots." In Fingerprints in the Optical and Transport Properties of Quantum Dots. InTech, 2012. http://dx.doi.org/10.5772/36179.
Full textBenhaddou, F., I. Zorkani, and A. Jorio. "The Confinement Effect in Spherical Inhomogeneous Quantum Dots and Stability of Excitons." In Prime Archives in Physical Sciences. Vide Leaf, Hyderabad, 2020. http://dx.doi.org/10.37247/paphys.1.2020.9.
Full textEdrissi, S. Janati, I. Zorkani, K. Rahmani, and A. Jorio. "Diamagnetic Susceptibility of a Magneto-Donor in GaAs Spherical and Cylindrical Quantum Dot." In Advanced Aspects of Engineering Research Vol. 2, 54–64. Book Publisher International (a part of SCIENCEDOMAIN International), 2021. http://dx.doi.org/10.9734/bpi/aaer/v2/7259d.
Full textConference papers on the topic "Spherical quantum dots"
Menéndez, E., C. Trallero-Giner, and E. Casado. "Impurity absorption in spherical quantum dots." In The 8th Latin American congress on surface science: Surfaces , vacuum, and their applications. AIP, 1996. http://dx.doi.org/10.1063/1.51198.
Full textCasado, E., and C. Trallero-Giner. "Stark effect in spherical quantum dots." In The 8th Latin American congress on surface science: Surfaces , vacuum, and their applications. AIP, 1996. http://dx.doi.org/10.1063/1.51199.
Full textLiao, Yu-Cheng, Shih-Yen Lin, and Si-Chen Lee. "Spherical SiGe Quantum Dots Prepared by Thermal Evaporation Method." In 2000 International Conference on Solid State Devices and Materials. The Japan Society of Applied Physics, 2000. http://dx.doi.org/10.7567/ssdm.2000.d-5-7.
Full textPeres, Filipa C. R., and Mikhail I. Vasilevskiy. "Near-field resonant energy transfer between spherical quantum dots." In Second International Conference on Applications of Optics and Photonics, edited by Manuel Filipe P. C. Martins Costa and Rogério Nunes Nogueira. SPIE, 2014. http://dx.doi.org/10.1117/12.2060888.
Full textKharitonov, Sergey, Nikolay Kazanskiy, and Ann Frize. "Calculating the band structure of an array of spherical quantum dots." In 2020 International Conference on Information Technology and Nanotechnology (ITNT). IEEE, 2020. http://dx.doi.org/10.1109/itnt49337.2020.9253201.
Full textLee, Seung Joo. "Transitions of dimensional states in quantum dots formed by spherical barrier." In PHYSICS OF SEMICONDUCTORS: 27th International Conference on the Physics of Semiconductors - ICPS-27. AIP, 2005. http://dx.doi.org/10.1063/1.1994345.
Full textKlose, Alexander D., Yared Tekabe, and Lynne Johnson. "Hyperspectral Fluorescence Tomography Of Quantum Dots Using The Simplified Spherical Harmonics Equations." In European Conference on Biomedical Optics. Washington, D.C.: OSA, 2011. http://dx.doi.org/10.1364/ecbo.2011.80880v.
Full textKlose, Alexander D., Yared Tekabe, and Lynne Johnson. "Hyperspectral fluorescence tomography of quantum dots using the simplified spherical harmonics equations." In European Conferences on Biomedical Optics, edited by Andreas H. Hielscher and Paola Taroni. SPIE, 2011. http://dx.doi.org/10.1117/12.889704.
Full textHayrapetyan, D. B., E. M. Kazaryan, and H. Kh Tevosyan. "Influence of hydrostatic pressure on electronic states and optical properties of spherical quantum dots." In SPIE Optics + Optoelectronics, edited by Roman Sobolewski and Jaromír Fiurásek. SPIE, 2013. http://dx.doi.org/10.1117/12.2016912.
Full textUOZUMI, TAKAYUKI, and YOSUKE KAYANUMA. "THEORY OF OPTICAL RESPONSES OF SPHERICAL QUANTUM DOTS UNDER STATIC AND DYNAMICAL EXTERNAL FIELDS." In Proceedings of 2000 International Conference. WORLD SCIENTIFIC, 2001. http://dx.doi.org/10.1142/9789812811387_0101.
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