Optical Control of Polarization in Hybrid 2D-Ferroelectric Structures
Alexei Gruverman, Alexander Sinitskii, and Chang-Beom Eom
Switchable electric polarization of ferroelectric materials can serve as a state variable in advanced electronic systems, such as non-volatile memories and logic. Control of ferroelectric polarization by external stimuli is the key component for these systems. Nebraska MRSEC researchers have discovered an optical control of the hybrid structures comprising a two-dimensional (2D) semiconducting material, molybdenum disulfide (MoS2), and ultrathin ferroelectric barium titanate (BaTiO3). They showed that optical excitation of MoS2 by ultraviolet light leads to polarization reversal in the BaTiO3 film accompanied by a significant change in electric resistance of the hybrid structure. These findings reveal a great potential of the 2D semiconductor-ferroelectric structures for future nanoelectronic devices with optically controlled functionalities.
This research is supported by the National Science Foundation, Division of Materials Research, Materials Research Science and Engineering Program, Grant DMR-1420645.
Optically-induced polarization reversal in hybrid MoS2/BaTiO3 (BTO) structures: geometry of experiment (left panel) and polarization state of BaTiO3 (right panels). The BaTiO3 surface is partially covered with MoS2. Under ultraviolet (UV) illumination polarization of the BaTiO3 film underneath the MoS2 flake is reversed as indicated by color.
Highlight InfoDate: April 2018
IRG2: Polarization-enabled Electronic Phenomena