Optical Control of the Layer Degree of Freedom through Wannier-Stark States in Polar 3R MoS2

Title
Optical Control of the Layer Degree of Freedom through Wannier-Stark States in Polar 3R MoS2
Authors
최정혜장차운곽준영박재홍여인원한규승황철성
Keywords
polar symmetry 3R MoS2; layer-index; optical selection rule; transition metal dichalcogenide
Issue Date
2019-05
Publisher
Journal of physics, Condensed matter : an Institute of Physics journal
Citation
VOL 31, NO 31, 315502
Abstract
Electrons in two-dimensional layered crystals gain a discrete positional degree of freedom over layers. We propose the two-dimensional transition metal dichalcogenide homostructure with polar symmetry as a prototypical platform where the degrees of freedom for the layers and valleys can be independently controlled through an optical method. In 3R MoS2, a model system, the presence of the spontaneous polarization and built-in electric field along the stacking axis is theoretically proven by the density functional theory. The K valley states under the electric field exhibit Wannier– Stark type localization with atomic-scale confinement driven by double group symmetry. The simple interlayer-dynamics-selection rule of the valley carriers in 3R homostructure enables a binary operation, upward or downward motion, using visible and infrared light sources. Together with the valley-index, a 2  2 states/cell device using a dual-frequency polarized light source is suggested.
URI
http://pubs.kist.re.kr/handle/201004/69395
ISSN
0953-8984
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KIST Publication > Article
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