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Сорокин Павел Борисович
Pavel Borisovich Sorokin

Academic Degrees and Titles 
Dr. habil, associate professor 

Academic Position
leading research scientist

Name of the University
Technological Institute for Superhard and Novel Carbon Materials

Russian Federation 

Name of the Chair/Lab 
Laboratory of novel materials simulation 

Research area
Investigation of effect of super- and ultrahigh hardness, the search for new superhard materials, the investigations of diamond based nanostructures, the study of the properties of prospective nanomaterials

Major Scientific Advances
Dr. Sorokin’s studies are devoted to the theoretical investigation of the rapidly growing field of promising two-dimensional materials which was established by remarkable discovery and investigation of free-standing graphene. Graphene displays number of interesting properties that allow to consider it as promising candidate for the base of future nanoelectronics. The major hurdle for its application in electronic devices is the lack of a consistent method to open the zero gap of graphene in a controlled fashion. The opening of band gap in graphene is one of the most challenging problems of today science of 2D materials whereas other research trend is devoted to the investigation of naturally semiconducting inorganic 2D counterparts. Dr. Sorokin’s studies are dedicated to both lines of research.

Dr. Sorokin and his colleagues explored how a few-layer graphene can undergo phase transformation into diamane under reduced or no pressure, if the process is facilitated by functionalization of the surface_s. Such “chemically induced phase transition” is inherently nanoscale phenomenon, when the surface_ conditions directly affect thermodynamics, and the transition pressure depends greatly on film thickness. For the first time, by ab initio computations of the Gibbs free energy, a phase diagram (P,T,h) of diamond film versus multilayered graphene was obtained. It describes accurately the role of film thickness h and shows feasibility of creating novel quasi-2D materials. It was shown that the chemically induced phased transition allows the fabrication of the carbon films not only with diamond crystal structure but also with lonsdaleite structure, it can open the way to fabricate single-crystal hexagonal diamond which mechanical rigidity overcomes cubic diamond one. Moreover, it was shown that the atomic structure of the resulted film will depend on the adatoms arrangement on the graphene surface_ that can be controlled by external pressure and temperature.

In collaboration with group of Prof. Pulickel Ajayan (Rice University) the mechanical properties of boron nitride atomic layers were studied.  The measured mechanical properties of the h-BN film were via nanoindentation were supported by proposed nanoindentation modeling. Theoretical computation explained well unusual measured experimental data such as high elastic modulus and other mechanical properties of h-BN sheet. This paper was published in Nano Letters and was cited more than 500 times.

Collaboration with Tulane University, USA, resulted in work published in Nature Physics where the investigation of new 2D Nb3SiTe6 film was carried out. It was obtained in both experimental and theoretical ways that when the thickness of Nb3SiTe6 crystal is reduced an unexpected, enhanced weak-antilocalization signature in magnetotransport is appeared, attributable to the suppression of e-ph interaction caused by 2D confinement on phonons.

The general graphitization tendency in ultrathin slabs of the ionic compound including rocksalt and cesium chloride-type structures was shown. In the paper published in Nano Letters in 2014 the critical slab thickness for a range of systems, below which a spontaneous conversion from a cubic to a layered graphitic structure occurs was determined. Such graphitization process in ionic materials was investigated in details for thin slabs of simplest and most accurately studied cubic sodium chloride. It was found that the in the nanoscale level ultra thin cubic NaCl layers become unstable due to the destabilizing surface_ dipole moment which leads to the transformation to graphite-like phase. The critical thickness at which the transformation from cubic to graphite-like phase occurs was obtained.

Research Projects and Contracts
Research Project of Federal Target Program 14.В37.21.1645. The study of fabrication methods and properties of single-crystal diamond films with nanometer thickness

RFBR 12-02-31261. Investigation of the features of the electronic, elastic and mechanical properties of the materials based on the nanosize_d diamond clusters

Grant of President of Russian Federation for government support of young PhD scientists

Referee, Reviewer 
Nano Letters, Advanced Materials, Applied Physics Letters, Physical Status Solidi (in top 100 referee list of 2010/2011., Nanoscale, Physical Chemistry Chemical Physics, Computational Materials Science

Scientific Recognition 
Award of Academia Europaea for young scientists in physics, Scopus Award Russia 2015 for high scientific activity

More than 60 papers in international journals which include Nature Physics, Nature Communications, Nano Letters, ACS Nano, J. Phys. Chem. Lett. etc.

Top 10 papers 

1.      J. Hu, X. Liu, C.L. Yue, J.Y. Liu, H.W. Zhu, J.B. He, J. Wei, Z.Q. Mao, L.Yu. Antipina, Z.I. Popov, P.B. Sorokin, T.J. Liu, P.W. Adams, S. Radmanesh, L. Spinu, H. Ji and D. Natelson, Enhanced electron coherence in atomically thin Nb3SiTe6, Nature Physics 11, 6, 471-476  (2015)

2.      A.G. Kvashnin, P.B. Sorokin, B.I. Yakobson Flexoelectricity in carbon nanostructures: nanotubes, fullerenes, nanocones J. Phys. Chem. Lett. 6, 2740-2744 (2015)

3.      Yu.A. Kvashnina, A.G. Kvashnin, M.Yu. Popov, B.A. Kulnitskiy, I.A. Perezhogin, E.A. Tyukalova, L.A. Chernozatonskii, P.B. Sorokin, V.D. Blank, Toward the ultra-incompressible carbon materials. Computational simulation and experimental observation, J. Phys. Chem. Lett. 6, 2147–2152 (2015)

4.      D.M.Tang., D.G. Kvashnin, S. Najmaei, Y. Bando, K. Kimoto, P. Koskinen, P. Ajayan, B.I. Yakobson, P.B. Sorokin, J. Lou, D. Golberg, Nanomechanical cleavage of molybdenum disulphide atomic layers, Nature Communications 5, 3631 (2014)

5.      A.G. Kvashnin, P.B. Sorokin, D. Tománek Graphitic phase of NaCl. Bulk properties and nanoscale stability. J. Phys. Chem. Lett. 5, 22, 4014-4019 (2014)

6.      A.G. Kvashnin, L.A. Chernozatonskii, B.I. Yakobson, P.B. Sorokin, Phase diagram of quasi-two-dimensional carbon, Nano Letters 14, 2, pp. 676-681 (2014)

7.      P.B. Sorokin, H. Lee, L. Yu. Antipina, A.K. Singh and B.I. Yakobson Calcium-decorated carbyne networks as hydrogen storage media Nano Lett. 11, 7, 2660–2665 (2011)

8.      L.A. Chernozatonskii, P.B. Sorokin, A.A. Kuzubov, B.P. Sorokin, A.G. Kvashnin, D.G. Kvashnin, P.V. Avramov and B.I. Yakobson, The influence of size_ effect on the electronic and elastic properties of diamond films with nanometer thickness J. Phys. Chem. C 115, 1, 132-136 (2011)

9.      L. Song, L. Ci, H. Lu, P.B. Sorokin, C. Jin, J. Ni, A.G. Kvashnin, D.G. Kvashnin, J. Lou, B.I. Yakobson and P.M. Ajayan, Large scale growth and characterization of atomic hexagonal boron nitride layers Nano Lett.10, 8, 3209-3215 (2010)

10.   L. A. Chernozatonskii, P.B. Sorokin and J. Brüning, Two-dimensional semiconducting nanostructures based on single graphene sheets with lines of adsorbed hydrogen atoms, Applied Physics Letters 91, 183103 (2007)

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