Languages:

English, Russian, Ukrainian

Education:

Field of Scientific Interest:

Condense matter physics. In particular, properties of topological materials and physics of vortices in type-II superconductors.

Main Achievements:

• Theory of the electron phenomena in condensed matter physics. The following results were obtained in this field:
  (i) The Berry phase, equal to π, can occur even in crystals with negligible spin-orbit interaction if an electron orbit surrounds a band-contact line in the Brillouin zone of such a crystal ]26].
  (ii) A nonzero Berry phase changes the semiclassical quantization condition for electron orbits in topological semimetals and insulators, this change has the universal form even if the Berry phase differs from π and manifests itself in the phase of the quantum oscillations [23,26,40,45,57,58,65,74, 76,78,93, 112,115,118].
  (iii) Magnetization [11,18,75,102,105-107,110,113] and magnetostriction [103,114] of electrons in nodal-line, Dirac and Weyl topological semimetals can exhibit anomalies. These anomalies occur at electron topological transitions [98,100,101,108] that differ from the well-known Lifshitz transitions of the 2½ kind.
• Vortex physics. The main results in this field are the following:
  (i) The H-T phase diagrams of type-II superconductors were analyzed, taking into account thermal fluctuations of the order parameter and flux-line pinning [13,17,36,38,46,53].
  (ii) The complete set of the critical state equations for thin flat anisotropic superconductors was derived [31,59,71].
  (iii) Exact solutions of the equations describing the critical [32,67,84] and Meissner [33] states were obtained for superconductors of realistic shapes.
  (iv) The vortex-shaking effect was explained [37,41,49,72].
  (v) Effects of a sample shape and of anisotropy of the flux-line pinning on magnetic relaxation in type-II superconductors were studied [20,24,30,39,47,56].
  (vi) Penetration of vortices into type-II superconductors with rectangular cross sections [95,117] and the critical current of such superconductors [111] were analyzed, taking into account an interplay between the Bean-Livingston and geometrical barriers.

Professional Experience:

Since 1981 has been working at ILTPE.

During 1998-2010 - invited scientist at Max Planck Institute (Stuttgart, Germany)

Publications:

Number of papers: 119 (in the refereed journals - 119)

The full list of the publications is here:

Selected Publications for the last 10 years:

1. Grigorii P. Mikitik, Quasi-Dirac points in electron-energy spectra of crystals, Communications Physics 7, 295, 1-9 (2024).
2. T. Cichorek, L. Bochenek, J. Juraszek, Yu. V. Sharlai, G. P. Mikitik, Detection of relativistic fermions in Weyl semimetal TaAs by magnetostriction measurements, Nature Communications 13, 3868, 1-9 (2022).
3. G. P.Mikitik, Critical current in thin flat superconductors with Bean-Livingston and geometrical barriers, Phys. Rev. B 104, 094526, 1-18 (2021).
4. G.P. Mikitik, Yu.V.Sharlai, Magnetic susceptibility of topological semimetals (Review article), J. Low Temp. Phys. 197, N3/4 272-309 (2019).
5. L. Embon, Y. Anahory, Z.L. Jelic, E.O. Lachman, Y. Myasoedov, M.E. Huber, G.P. Mikitik, A.V. Silhanek, M.V. Milosevic, A. Gurevich, & E. Zeldov, Imaging of super-fast dynamics and flow instabilities of superconducting vortices, Nature Communications 8, 85 (2017).