Department of Theoretical Physics, B. Verkin Institute for Low Temperature Physics & Engineering, National Academy of Sciences of Ukraine, 47 Lenin Ave., Kharkov, 61164, Ukraine Email: igorpoltavsky@gmail.com

Position: Junior researcher.

Research area: Low dimensional strongly correlated and magnetic systems.

Current interests: Combination of numerical and analytical approaches for lattice models.

  • 2006-Present

    Theory of Quantum Magnetism and Condensed Matter Systems: Study of correlation functions, spin susceptibility and heat capacity of two-dimensional t-J model and low-dimensional Heisenberg model with anisotropic exchange interaction by means of two-time Green function formalism. Study of finite temperature phase diagram and calculation of thermodynamic functions for a quantum square and triangular lattice hard-core boson model with the nearest and next nearest neighbor interaction within the random phase approximation. Study of excitation spectra of hard-core bosons with nearest and next nearest neighbor interactions on square and triangular lattices in the superfluid phase within the spin-wave theory beyond the standard linear spin-wave approximation.

  • 2003-2006

    Theoretical study of adsorption and thermodynamic functions of atomic and molecular adsorbates on carbon nanobundles: Study of adsorption and thermodynamic functions of atoms formed so called three-line subsystem in the grooves of carbon nanobandle and formation of the first layer on the outer surface using Green function and transfer-matrix formalisms.

  • 2001-2003

    Theoretical study of rare gas low-dimensional criocrystals: Study of phonon spectra and thermodynamic functions of pure rare gas monolayers and two-layers on substrates.

  • 1998-2001

    Teoretical study of wave propagation in waveguides: Study of wave propagation in composite cylindrical waveguides.

  • 2003-2009

    Ph.D. in Theoretical Physics, B. Verkin Institute for Low Temperature Physics & Engineering, National Academy of Sciences of Ukraine, Kharkov, Ukraine. Thesis: “Structural, thermal and magnetic properties of atomic and molecular cryocrystals.” Supervisor: Prof. Konstantin Chishko.

  • 2002-2003

    M.Sc. in Theoretical Radiophysics — with Highest Honors (5.00 / 5.00 GPA), Kharkiv State University, Ukraine. Thesis: “The spectrum of translational excitations and heat capacity of two-layers criocrystals.” Supervisor: Prof. Vadim Kozansky.

  • 1998-2002

    Bachelor in Theoretical Radiophysics — with Highest Honors (5.00 / 5.00 GPA), Kharkiv State University, Ukraine. Thesis: “The spectrum of collective excitations and heat capacity of two-dimensional monoatomic criocrystal on a substrate.” Supervisor: Prof. Vadim Kozansky.

  1. T. N. Antsygina, M. I. Poltavskaya, I. I. Poltavsky, and K. A. Chishko. Excitation spectra of hardcore bosons on square and triangular lattices in superfluid phase // Phys. Rev. B, 2010, V. 82, N 14, P. 144504(10).
  2. T. N. Antsygina, M. I. Poltavskaya, I. I. Poltavsky, and K. A. Chishko. Square lattice hard-core bosons within the random phase approximation // Phys. Rev. B, 2009, V. 80, N 17, P. 174511(9).
  3. T. N. Antsygina, I. I. Poltavsky, M. I. Poltavskaya, and K. A. Chishko. Thermodynamics of lowdimensional spin-1/2 Heisenberg ferromagnets in an external magnetic field within Green function formalism // Phys. Rev. B, 2008, V. 77, N 2, P. 024407(10).
  4. T. N. Antsygina, I. I. Poltavsky, M. I. Poltavskaya, and K. A. Chishko. Heat capacity and spin susceptibility of two-dimensional t-J model // FNT, 2007, V. 33, N 6/7, P. 814-819.
  5. T. N. Antsygina, I. I. Poltavsky, and K. A. Chishko. Exactly solved model for 4He adsorption on carbon nanotube bundles // J. Low Temp. Phys., 2007, V. 148, N 5/6, P. 821-826.
  6. T. N. Antsygina, I. I. Poltavsky, and K. A. Chishko. Thermodynamics of low-dimensional adsorption in grooves, on the outer surface, and in interstitials of a close-ended carbone nanotube bundle // Phys. Rev. B, 2006, V. 74, N 20, P. 205429(10).
  7. T.N. Antsygina, I.I. Poltavsky, K.A. Chishko, T.A. Wilson and O.E. Vilches. Thermodinamics of quasi-one-dimensional deposits on carbon nanobundles // FNT, 2005, V. 31, N 12, P. 1328 - 1340.
  8. T. N. Antsygina, I. I. Poltavsky, and K. A. Chishko. Dynamics and thermody-namics of quasi-onedimensional helium deposited on carbon nano-bundles // J. Low Temp. Phys., 2005, V. 138, N 1/2, P. 223-228.
  9. T. N. Antsygina, I. I. Poltavsky, M. I. Poltavskaya, and K. A. Chishko. Lattice dynamics and heat capacity of a two-dimensional monoatomic crystal on a substrate // FNT, 2002, V. 28, N 6, P. 621-634.
  10. T. N. Antsygina, I. I. Poltavsky, and K. A. Chishko. Lattice dynamics of 2D monoatomic crystal: Application to 3He on graphite // J. Low Temp. Phys., 2002, V. 126, N 1/2, P. 15-20.