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Journal of Materials Science and Nanotechnology | Volume 3

February 25-26, 2019 | Paris, France

Materials Science and Engineering

International Conference on

Gigantic transverse dielectric screening in Quasi-2D materials

Vladimir U Nazarov

and

Eugene E Krasovskii

Academia Sinica, Taiwan

University of the Basque Country, Spain

he electrical and optical properties of quasi-two-

dimensional (Q2D) materials are predominantly known

within their macroscopic in-plane dimensions. In the latter

regime, the strictly 2D models, neglecting the finite thickness

of the systems, serve, in most cases, as already a satisfactory

approximation to study the corresponding phenomena. Here,

on the contrary, we explore the reaction of the Q2D materials

to the static and dynamic electric fields applied perpendicularly

to the systems’ layer(s), when finite, although microscopic,

transverse extent of the system plays a defining role. Counter-

intuitively, in spite of the robustness of the inter-atomic bonds,

we discover the full or almost full screening of the external

field in the interior of the Q2D crystals. The dramatic effect of

these findings on the photoemission spectroscopy of the Q2D

materials is revealed and discussed, leading, in particular to the

failure of the conventional dipole theory of photoemission for

these systems. In order to better understand the underlying

physical processes, we introduce the Q2D jellium model which

qualitatively reproduces results of our Ab initio calculations.

Speaker Biography

Vladimir U Nazarov completed his Ph.D in physics and currently an associate research

fellow at the Research Center for Applied Sciences, Academia Sinica, Taiwan. His research

focuses on the fundamentals of Time-Dependent Density-Functional Theory (TDDFT) and

its applications to optics and transport in bulk materials and low-dimensional structures.

He has his habilitation (in Russia, Doctor of Physical and Mathematical Sciences) from

the Far-Eastern National University, Russia. The past positions of him include the Leading

researcher at the Institute for Automation, Far-Eastern Branch of Russian Academy of

Sciences, associate professor at Kyushu Institute of Technology, Japan, visiting professor

at the Institute for Solid State Physics, Japan, and visiting professor at Chonnam National

University, South Korea.