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Biaxial Strain and Electric Field Dependent Conductivity of Monolayer WTe 2 on Top of Fe 3 O 4 (111)
Author(s) -
Song Yan,
Mi Wenbo,
Wang Xiaocha
Publication year - 2016
Publication title -
advanced materials interfaces
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.671
H-Index - 65
ISSN - 2196-7350
DOI - 10.1002/admi.201600581
Subject(s) - materials science , electric field , monolayer , condensed matter physics , conductivity , electrical resistivity and conductivity , fermi level , spintronics , polarization (electrochemistry) , nanotechnology , physics , electron , ferromagnetism , chemistry , quantum mechanics
The biaxial strain and electric field dependent electronic properties of monolayer WTe 2 on top of Fe 3 O 4 (111) are investigated by first‐principles calculations. Our results demonstrate that mechanical strain effectively separates the contributions of interface state and valley states to the conductivity of monolayer WTe 2 . Tensile strain shifts the interface state below Fermi level. The conductivity of WTe 2 is dominated by valley states. With compressive strain, the interface state is shifted away from the valley state edge. The conductivity is only subject to the spin‐polarized interface state. Applying perpendicular electric field also yields valley‐state‐dominating conductivity. The valley splitting energy reduces from 139 to −68 meV with an electric field of 0.02 V nm −1 . Different from applying strain, valley polarization is robust against wide range of electric field intensity, showing potential applications in spintronic and valleytronic devices.