Dr. Igor Berkutov

Date of Birth: September 30, 1968
Place of Birth: Kharkov, USSR
Nationality: Ukraine citizen
Marital status: married
Children: daughter (1993), daughter (2007)

B.I. Verkin Institute for Low Temperature Physics and Engineering Nanional Academy of Science of Ukraine
47 Nauky Avenue, 61103, Kharkov, Ukraine
     Tel: 380-57-3410963
     Fax: 380-57-3403370
     E-mail: berkutov@ilt.kharkov.ua

Education
1985 - 1993 Kharkov State University, Kharkov, Ukraine.
June 1993, MSc degree in Radiophysics.
1993 - 1996 Institute For Low Temperature Physics Kharkov, Ukraine, PhD student.
November 1998, PhD degree in Low Temperature Physics.

Awards received
1996 Personal Soros studentship.
1998 Inoue Foundation for Science one year fellowship as a post-doc in the Kyushu University, Fukuoka, Japan.
2002 Personal fellowship of National Academy of Science of Ukraine.

Employment
1996 - 1998 Junior researcher, B.I. Verkin Institute for Low Temperature Physics and Engineering, Kharkov, Ukraine.
1998 - 1999 Researcher, Kyushu University, Fukuoka, Japan.
1999 - 2000 Researcher, B.I. Verkin Institute for Low Temperature Physics and Engineering, Kharkov, Ukraine.
2000 - 2002 Research Associate, The University of Manchester, Manchester, UK.
2002 - 2005 Researcher, B.I. Verkin Institute for Low Temperature Physics and Engineering, Kharkov, Ukraine.
2005 - 2006 Associated professor, Kyushu University, Fukuoka, Japan.
2006 - 2008 Researcher, B.I. Verkin Institute for Low Temperature Physics and Engineering, Kharkov, Ukraine.
July 2008 Senior Researcher, B.I. Verkin Institute for Low Temperature Physics and Engineering, Kharkov, Ukraine.

Research interest:
    My major research interest is the experimental investigation of transport and kinetic properties of low dimensional conducting systems, which was carried out in thee directions. First of them is the investigations of edge magnetoplasmon oscillations in the two-dimensional electron system over liquid helium surface. The results of this study were an experimental observation and an investigation of new modes of edge magnetoplasmons such as magnetoripplon and "acoustic" modes, as well as a boundary magnetoplasmons, which propagate among the border of two electron sheets with different densities. Next direction of my experimental activity is a study of transport properties of quasi-one-dimensional electron systems formed on the helium film, which wets a profiled dielectric substrate. It was shown that the mobility of this system could be both very low in weak localization regime and very high close to the value of the electron mobility of the electron system over balk helium. In the first case the mobility of the charge carriers depends exponentially on the temperature with activation energy of few degrees. At low temperatures in the last regime the conductivity of this system demonstrates peak near 0.2 K, which is the evidence of the one-dimensional character originating in the intersubband transitions that was observed for the first time. The third direction deals with the investigation of kinetic properties of Si/SiGe-based p-type heterostructures with SiGe quantum wells. The magnetoquantum effects such as Shubnikov-de Haas oscillations and Quantum Hall effect were studied in high magnetic fields regime. Simultaneously the quantum-interference effects such as a weak localization, hole-hole and spin-orbit interactions were studied in a low magnetic field. The quantum characteristic parameters of two-dimensional hole system as well as the parameters of hole-phonon interaction were calculated. The value of spin splitting was estimated for the heterostructures studied for the first time. Another part of my scientific activity is the investigation of acoustic properties of the aerogel-glass filed with 4He. This study resulted in the first direct experimental observation of the transverse sound in this system. Using the transverse sound technique the tortuosity of aerogel was measured as a function of the helium film coverage.

Cryogenic technique:

* Design of parts, assembling and working on a conventional type of a dilution refrigerator. * Design, assembling and working on the 3He refrigerator (S. Babuin /Transverse sound in liquid Helium-4 in aerogel / A thesis submitted to the University of Manchester for the degree of Ph.D. in the Faculty of Science and Engineering, 2004). * Design and assembling of cryogenic experimental cells.

Experience of scientific publishing:
Book titled "Methods of obtaining and measurement of low and super low temperatures" authors Grigor'ev V. N., Ivantshov V. G., Koval' V. A., Rudavskii E. Ya., Golub A. A., and Zvjagina N. M. was translated and edited by Hideki Yayama and myself from Russian into Japanese (Russian edition by Naukova Dumka Publishers, Kiev, Ukraine 1987, Japanese edition by Kyushu University Press, Fukuoka, Japan 2000).

Pedagogical experience:
Supervision of master degree projects in physics undergraduates at the University of Manchester and at B.I. Verkin Institute for Low Temperature Physics & Engineering.

List of main publications:
1. O.I. Kirichek, I.B. Berkutov, Magnetoplasmons in a system of surface electrons in helium at a boundary between regions with different charge densities // Low Temp. Phys., 21, 394 (1995).
2. O.I. Kirichek, I.B. Berkutov, Yu.Z. Kovdrya, and V.N. Grigor'ev. New modes of edge magnetoplasma oscillations in an electron system over liquid helium // Low Temp. Phys., 21, 785 (1995).
3. O.I. Kirichek, I.B. Berkutov, Yu.Z. Kovdrya, and V.N. Grigor'ev. Analysis of peculiarities in the propagation of edge magnetoplasmons in a sheet of surface electrons // Low Temp. Phys., 22, 246 (1996).
4. O.I. Kirichek, I.B. Berkutov, Yu.Z. Kovdrya, and V.N. Grigor'ev. The spectrum of edge magnetoplasmons in a sheet of electrons over liquid helium // Czech. J. Phys., 46-S1, 248 (1996).
5. O.I. Kirichek, I.B. Berkutov, Yu.Z. Kovdrya, and V.N. Grigor'ev. Evidence for the Edge Magnetoplasmons "Acoustic" Mode in an Electron Layer over Liquid Helium // JLTP, 109, 1/2, 397 (1997).
6. Hideki Yayama, Akihisa Tomokiyo O.I. Kirichek, I.B. Berkutov and Yu.Z. Kovdrya. Carrier transport in Quasi-One-Dimensional Electron System over Liquid Helium under Strong Localization Condition // FNT, 23, 878-881 (1997).
7. Yu.Z. Kovdrya, V.N. Nikolaenko, Hideki Yayama, Akihisa Tomokiyo, O.I. Kirichek, I.B. Berkutov. Mobility and Localization of Carriers in Quasi-One-Dimensional Electron System over Liquid Helium // JLTP, 110, 1/2, 191 (1998).
8. Hideki Yayama, Igor B. Berkutov and Akihisa Tomokiyo. Electrical conductivity of quasi-one-dimensional electrons on helium film // Physica B, 284, 1914 (2000).
9. Yu.F. Komnik, V.V. Andrievskii, I.B. Berkutov, S.S. Kryachko, M. Myronov, T.E. Whall. Quantum effects in hole Si/SiGe heterostructures // Low Temp. Phys., 26, 8, 829 (2000).

10. V.V. Andrievskii, I.B. Berkutov, Yu.F. Komnik, O.A. Mironov, and T.E. Whall. Temperature dependence of electron-phonon relaxation time of charge carriers in p-Si/SiGe heterojunctions // Low Temp. Phys., 26, 12, 1202 (2000).
11. I.B. Berkutov, S. Babuin, A.I. Golov, and J.R. Hook. Transverse resonances in aerogel with liquid 4He // JLTP, 126, 1/2, 667 (2002).
12. A.I. Golov, I.B. Berkutov, S. Babuin, D.J. Cousins /Characterization of fractals with an adsorbed superfluid film // Physica B, 229-233, № 1, 258 (2003).
13. I.B. Berkutov, S. Babuin and A.I. Golov .Transverse sound in aerogel with liquid 4He // Physica B, 229-233, 1, 337, (2003).
14. Hideki Yayama, Igor B. Berkutov. Temperature dependence of electrical conductance in 1D electron system formed on liquid helium surface // Physica E, 18, № 1-3, 177 (2003).
15. V.V. Andrievskii, I.B. Berkutov, T. Hackbarth, Yu.F. Komnik, O.A. Mironov, M. Myronov, V.I. Litvinov, and T.E. Whall /Quantum interference and spin-splitting effects in Si_(1-x)Ge_(x) p-type quantum wells/, Kluwer Academic Publishers B.V. NATO SCIENCE SERIES, II: Mathematics, Physics and Chemistry, V.148,"Molecular Nanowires and Other Quantum Objects", edited by Alexandre S. Alexandrov, Jure Demsar, Igor K. Yanson, April (2004).
16. S.S. Sosin, L.A. Prozorova, A.I. Smirnov, A.I. Golov, I.B. Berkutov, O.A. Petrenko, G. Balakrishnan, and M.E. Zhitomirsky. Magnetocaloric effect in pyrochlore antiferromagnet Gd₂Ti₂O₇ // Physical Review B, 71, 094413-1-5 (2005).
17. S.S. Sosin, L.A. Prozorova, A.I. Smirnov, A.I Golov., I.B. Berkutov, 0.A. Petrenko, G. Balakrishnan, M.E. Zhitomirsky. Adiabatic demagnetization of a pyrochlore antiferromagnet Gd₂Ti₂O₇ // Journal of Magnetism and Magnetic Materials, 290, 709 - 711, 0304-8853 (2005).
18. Yu.F. Komnik, I.B. Berkutov, V.V. Andrievskii.  Spin-orbit interaction in thin bismuth films// Low Temp. Phys., 3/4, 429 (2005).
19.  I.B. Berkutov, Yu.F. Komnik, V.V. Andrievskii, O.A. Mironov, M. Myronov, and D.R. Leadley, Weak localization and charge-carrier interaction effects in a two-dimensional hole gas in a germanium quantum well in a SiGe/Ge/SiGe heterostructure // Low Temp. Phys., 32, 683 (2006).
20. Yu.F. Komnik, I.B. Berkutov, V.V. Andrievskii, O.A. Mironov, M. Myronov, and D.R. Leadley, Features of the Shubnikov–de Haas oscillations of the conductivity of a high-mobility two-dimensional hole gas in a SiGe/Ge/SiGe quantum well // Low Temp. Phys., 32, 82 (2006).
21. Yu.F. Komnik, I.B. Berkutov, and V.V. Andrievskii, Manifestation of the spin-orbit interaction in bismuth films in a parallel magnetic field // Low Temp. Phys., 33, 105-114 (2007).

22. Komnik Yu.F., Andrievskii V.V., Berkutov I.B. Charge Transport in Quasi-One-Dimensional Electron System on Liquid Helium // "Journal of the Physical Society of Japan", 76, Supplement A, 196-197 (2007).

23. Komnik Yu.F., Andrievskii V.V., Berkutov I.B. Spin-Orbit Effects in Thin Bismuth Films // "Journal of the Physical Society of Japan" , 76, Supplement A, 200-201 (2007).
24. Nikolaenko V. A., Berkutov I.B., Kovdrya Yu. Z., Kobayashi R., Yayama H. Localization and Ordering of Carriers in a Quasi-One- Dimensional Electron Sys-tem on Liquid Helium // Journal of Low Temp. Phys., 148 , № 3-4, 175-179 (2007).

25. Berkutov I.B., Andrievskii  V.V., Komnik Yu.F., Myronov M., Mironov O.A. Overheating effect and hole-phonon interaction in SiGe heterostructures // Low Temp. Phys., 34, № 11, 1192-1196 (2008).

26. Berkutov I.B., Andrievskii  V.V.,  Komnik Yu.F., Leadley D.R., Myronov M., von Känel H., Mironov O.A. A new method of investigating the quantum channel surface // J.Phys.: Cond. Mat., 20, № 22, 224024 (2008).

27. Berkutov I.B., Andrievskii V.V., Komnik Yu.F., Mironov O.A., Myronov M., Leadley D.R. Shubnikov-de Haas oscillations of the conductivity of a two-dimensional gas in quantum wells based on germanium and silicon. Determination of the effective mass and g factor // Low Temp. Phys., 35, № 2, 141 (2009).
28. I.B. Berkutov, V.V. Andrievskii, Yu.F. Komnik, and O.A. Mironov. Positive quasiclassical magnetoresistance and quantum effects in germanium quantum wells // Low Temp. Phys., 36, 1076 (2010).
29. Leadley D.R., Andrievskii V.V., Berkutov I.B., Komnik Y.F., Hackbarth T., Mironov O.A. Quantum interference effects in p-Si(1-x)Ge(x) quantum wells // J. Low Temp. Phys., 159, 1/2, 230-233 (2010).
30. I.B. Berkutov. Low temperature overheating effect in SiGe p-type quantum wells. Methods of the hole-phonon energy relaxation time determination // Acta Ðhysica Polonica. A, 119, 2, 228-230 (2011).
31. I.B. Berkutov, V.V. Andrievskii, Yu.F. Komnik, and O.A. Mironov. Study of overheating effects in in SiGe p-type heterostructures: Methods of the hole temperature determination // Mat.-wiss. u. Werkst of tech., 42, 1, 15-19 (2011).
32. Berkutov I.B., Andrievskii V.V., Komnik Yu.F., Hackbarth T., Leadley D.R., Mironov O.A. On the Magnetoresistance Maximum Observed in the Intermediate Magnetic Field Region for the Two-Dimensional Hole Gas in a Strained Si 0.05Ge0.95 Quantum Well // JLTP, v. 168, № 5-6, 285-291 (2012).
33. Berkutov I.B., Andrievskii V.V., Komnik Yu.F., Kolesnichenko Yu.A., Morris R.J.H., Leadley D.R., and Mironov O.A. Magnetotransport studies of SiGe-based p-type heterostructures: problems of the effective mass determination // Low Temp. Phys., 38, № 12, 1455-1463 (2012).


Names of referees

*Dr. Hideki Yayama
Department of Physics,
Kyushu University,
Ropponmatsu, Fukuoka 810-8560, Japan
Phone & Fax: 92-726-4731
E-mail: yayama@rc.kyushu-u.ac.jp

*Dr. Andrei Golov
Department of Physics and Astronomy,
University of Manchester,
Oxford Road, Manchester,
M13 9PL,UK
Phone: 44-161-275-4068
Fax: 44-161-275-4056
Email: andrei.golov@man.ac.uk

* Dr. Vladimir Andrievskii
B. I. Verkin Institute for Low Temperature Physics & Engineering
47 Lenin Avenue, 310064, Kharkov, Ukraine
Tel: 380-572-308563
Fax: 380-572-322370
E-mail: andrievskii@ilt.kharkov.ua