Condensed Matter Theory Group

Lattice dynamics of pure and defect crystals

Theory of optical line width for fundamental and localized vibrations absorption and Raman scattering is presented. Results are in good agreement with experimental data [1,2]

Thermodynamics of defect crystals

[3,4]

Physics of the surface

Description of structural phase transitions on solid surfaces within Landau-Lifshits theory is developed on the basis of three-dimensional diperiodic E.A.Wood space groups. The variety of new surface phase transitions is found [5]. The enhancement of hyper-Raman scattering from lattice vibrations in homogeneous surface region of a semiconductor is reported [6]

Light scattering from semiconductors

Theory of quasielastic electronic Raman light scattering from heavily doped A^IIIB^V semiconductors with nonparabolic band structure is given. Lorentzian shape of the spectral line witnesses of line broadening. The experimental part of the work has been performed in Ioffe Institute, in experimental group of Dr. B.H. Bairamov [7,8]

Disordered systems

Phonon distribution function of polar optical phonons in A^IIB^VI semiconductor alloys with uniaxial symmetry is given. The exact solution is obtained in collision controlled region by Lipatov-Brezin-Parizi method [9,10,11]

Theory of semiconductor alloy stability

Theory of semiconductor alloy epitaxial film decomposition into modulated two-phase structure is developed. Two different regimes are investigated: Thermodynamic equilibrium (spinodal) decomposition and nonequilibrium kinetic decomposition [12-16]

Theory of spontaneous formation of quantum dot arrays

Theories for the spontaneous formation of arrays of strained islands in heteroepitaxial systems are developed: formation of single-layered arrays of three-dimensional strained islands [17], formation of multi-layered arrays of islands [18]

References

1. R.F. Wallis, I.P. Ipatova, A.A. Maradudin. On the Line Width Temperature Dependence of the Fundamental Lattice Absorption in Ionic Crystals. FTT v.8, No.4, p. 1064-1078, 1966, (English translation: Sov. Phys. - Solid State v.8, No.4)
2. I.P. Ipatova, A.A. Klotchichin. Anharmonic Line Width of Localized Vibrations. JETP v.50, No.6, pp.1603-1610, 1966
3. G. Benedek, R.F. Wallis, I.P. Ipatova, A.A. Klotchichin, A.A. Maradudin, W.C. Overton. On Thermodynamic Equilibrium of a System of Gas and Crystal with Isotopic Defects. JETP, v.55, No.1, pp. 369-379, 1968, (English translation Sov. Phys.-JETP v.29, pp.193-197, 1968)
4. I.P. Ipatova, O.P. Chikalova-Lusina, K. Hess. Effect of the Localized Vibrations on the Si Surface Concentration of H and D. J. of Appl. Phys., v.83, No.2, pp. 814-819, 1998
5. I.P. Ipatova, Yu.E. Kitaev, A.V. Subashiev. Translational Symmetry Changes in Second-order Phase Transitions on Clean Crystal Surfaces. Surface Science, v.110, pp.543-554, 1981
6. I.P. Ipatova, A.Yu. Maslov, L.V. Udod, and G. Benedek. The Enhancement of Hyper Raman Effect from Semiconductor Surfaces. Phys. Stat. Sol. (a) v.170, pp. 291-300, 1998
7. B.H. Bairamov, I.P. Ipatova, E. Jane, A.V. Subashiev, V.V. Toporov, V.A. Voitenko. Light Scattering by Free Carries in InP and Ga_xIn_1-xP Sov. Phys. Solid State, v.28, No.3, pp.754-761, 1986, (English Translation: Sov. Phys.-Solid State v.28, No.3, 1986)
8. B.H. Bairamov, I.P. Ipatova, V.A. Voitenko. Light Scattering from Electron Density Fluctuations in Manyvalley Semiconductors. Sov. Phys.-Uspekhi, v.36, No.5, pp. 392-435, 1993
9. A.Yu. Maslov, L.G. Suslina, A.G. Areshkin, V.G. Melekhin, D.L. Fedorov. Effect of one-dimensional disorder on the exciton states in semiconductor solid solutions. JETP Letters, v. 37, No. 8, pp.440-443, 1983
10. I.P. Ipatova, V.A. Shchukin. Exact Solution of the Problem of the Polar Optical Phonon Green's Function and Phonon Distribution Function in the Diffusion Region of Uniaxial Crystal Solid Solutions. JETP, v.97, No.3, pp. 990-1003, 1990, (English Translation: Sov. Phys.-JETP v.70, No.3, 1990)
11. I.P. Ipatova and V.A. Shchukin. Exactly Solvable Problem for the Polar Optical Phonon Green's Function and the Phonon Distribution Function in the Energy Spectrum Diffusion Region of the Uniaxial Crystals Solid Solutions. Proceedings of Sir Roger Elliott 60th Birthday Seminar, Ed. G.J.A. Blackman, Cambridge, U.K., (1990), pp.127-133
12. I.P. Ipatova, V.G. Malyshkin, V.A. Shchukin. On Spinodal Decomposition in Elastically Anisotropic Epitaxial Films of III-V Semiconductor Alloys. J. Appl. Phys., v.74, pp. 7198-7210, 1993
13. I.P. Ipatova, V.G. Malyshkin, V.A. Shchukin, A.A. Maradudin, and R.F. Wallis. Kinetic Instability of the Semiconductor Alloy Growth. Phys. Rev. B, v.57, pp. 12968-12993, 1998
14. D. Bimberg, I.P. Ipatova, P.S. Kop'ev, N.N. Ledentsov, V.G. Malyshkin, and V.A. Shchukin. Spontaneous Ordering of Semiconductor Nanostructures. Uspekhi Fiz. Nauk, vol. 167, pp. 552-555, 1997, (Physics-Uspekhi, vol. 167, pp. 529-532, 1997)
15. V.A. Shchukin and A.N. Starodubtsev. Steady-state structures in composition-modulated alloys: Kinetic phase transition between 1D and 2D patterns. In: Self-Organized Processes in Semiconductor Alloys - Spontaneous Ordering, Composition Modulation, and 3-D Islanding. MRS Symposium Proceedings. V. 583. Pp. 327-332, 2000
16. L.S. Vavilova, V.A. Kapitonov, A.V. Murashova, N.A. Pikhtin, I.S. Tarasov, I.P. Ipatova, V.A. Shchukin, N.A. Bert, and A.A. Sitnikova. Spontaneously assembling periodic composition-modulated In GaAsP structures. Semiconductors v.33, No.9, pp.1010-1012, 1999
17. V.A. Shchukin, N.N. Ledentsov, P.S. Kop'ev, and D. Bimberg. Spontaneous Ordering of Arrays of Coherent Strained Islands. Phys. Rev. Lett. Vol. 75, No. 16, pp. 2968-2971, 1995
18. V.A. Shchukin, D. Bimberg, V.G. Malyshkin, and N.N. Ledentsov. Vertical Correlations and Anticorrelations in Multisheet Arrays of Two-dimensional Islands. Phys. Rev. B, vol. 57, No. 20, pp. 12262-12274, 1998
19. А.Ю. Маслов, О.В. Прошина. Роль интерфейсных фононов при формировании поляронных состояний в квантовых ямах. ФТП 44 (2), 200-204 (2010)
20. A.Yu. Maslov, O.V. Proshina. Interface phonons and polaron effect in quantum wires. Nanoscale Res. Lett., DOI 10.1007/s11671-010-9704-0, 1-5 (2010)
21. A.Yu. Maslov, O.V. Proshina. Interface phonons and dielectric enhancement effects on excitons in quantum well. Superlattices Microstruct. 47 (1), 213-215 (2010)
22. A.Yu. Maslov, O.V. Proshina. Interface phonons and polaron effect in II-VI quantum well. Phys. Status Solidi C 7 (6), 1609-1611 (2010)
23. A.Yu. Maslov, O.V. Proshina. New method for control over exciton states in quantum wells. J. Phys.: Conf. Ser. 210 (1), 012055 (2010)
24. М.Е. Компан, В.П. Кузнецов, В.Г. Малышкин. Нелинейный импеданс твердотельных энергонакопительных конденсаторов-ионисторов. ЖТФ 80 (5), 100-106, (2010)
25. M.B. Lifshits, M.I. Dyakonov. Swapping Spin Currents: Interchanging Spin and Flow Directions Phys. Rev. Lett. 103, 186601 (2009)
26. I.V. Rozhansky, M.B. Lifshits, S.A. Tarasenko, N.S. Averkiev. Conversion of hole states by acoustic solitons. Phys. Rev. B, 80, 085314 (2009)
27. M.B. Lifshits, M.I. Dyakonov. Photovoltaic effect in a gated two-dimensional electron gas in magnetic field. Phys. Rev. B, 80, 121304(R) (2009)
28. И.Ю. Сапурина, М.Е. Компан, В.Г. Малышкин, В.В. Розанов, Я. Стейскал. Свойства протонпроводящих мембран типа "Нафион" с поверхностными наноразмерными слоями электропроводящего полианилина. Электрохимия 45 (6), 744-754 (2009)
29. A.Yu. Maslov, O.V. Proshina, A.N. Rusina. Interface phonon effect on optical spectra of quantum nanostructures. J. Lumines 129 (12), 1934-1936 (2009)
30. А.Ю. Маслов, О.В. Прошина. Влияние спектра элементарных возбуждений на спинодальный распад полупроводниковых твердых растворов. ФТП 43 (7), 873-877 (2009)

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