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성명 Jaekwang Lee, Assistant Professor
소속 Department of Physics, Pusan National University, Busan, 46241 Korea
주제 Two dimensional polar metal
학력 University of Texas at Austin, Physics, Ph.D., 2010
Korea University, Physics, B.S. & M.S. & Ph.D. (taking off) 2003
경력 2015-p Assistant Professor, Physics, Pusan National University
2011-2014 Postdoctoral Associate, Oak Ridge National Lab2007-2010 Research Assistant, Physics, UT Austin
2004-2006 Teaching Assistant, Physics, UT Austin
요약 The coexistence of polarity and conducting characteristics are mutually excluded in general because the finite bandgap is always necessary to maintain permanent dipole moment existing in polar materials.
Therefore, all polar materials are essentially insulating while conducting materials are normally nonpolar.
Recently, we find that once two dimensional (2D) materials are distorted along the out-of-plane direction, both the electronic bandgap reduction and polarization simultaneously emerge in two dimensional 1H-MoTe2. First-principles density functional theory calculations show that this ripple feature can induce the flexorelectric effect along the out-of-plane and the effective tensile strain along the in-plane, respectively, and then develop the huge out-of-plane polarization and significantly reduce the electronic bandgap at the same time.
This extraordinary 2D polar conducting phenomena could help understanding the close interplay between polarity and conductivity in low dimension, and realize innovative devices and novel applications for the next generation of electronics.