Abstract
Mechanical strain can induce noteworthy structural and electronic changes in vanadium dioxide,imparting substantial scientific importance to both the exploration of phase transitions and the development of potential technological applica-tions.Unlike the traditional rutile(R)phase,bronze-phase vanadium dioxide[VO2(B)]exhibits an in-plane anisotropic structure.When subjected to stretching along distinct crystallographic axes,VO2(B)may further manifest the axial depen-dence in lattice-electron interactions,which is beneficial for gaining insights into the anisotropy of electronic transport.Here,we report an anisotropic room-temperature metal-insulator transition in single-crystal VO2(B)by applying in-situ uniaxial tensile strain.This material exhibits significantly different electromechanical responses along two anisotropic axes.We reveal that such an anisotropic electromechanical response mainly arises from the preferential arrangement of a strain-induced unidirectional stripe state in the conductive channel.This insulating stripe state could be attributed to the in-plane dimerization within the distorted zigzag chains of vanadium atoms,evidenced by strain-modulated Raman spectra.Our work may open up a promising avenue for exploiting the anisotropy of metal-insulator transition in vanadium dioxide for potential technological applications.
基金项目
国家重点研发计划(2023YFF1203600)
国家自然科学基金(62122036)
国家自然科学基金(62034004)
国家自然科学基金(12322407)
国家自然科学基金(61921005)
国家自然科学基金(12074176)
中国科学院战略规划重点项目(XDB44000000)
AIQ Foundation()
microfabrication center of the National Laboratory of Solid State Microstructures(NLSSM)()
program for Outstanding PhD Candidates of Nanjing University()
NETL
NSTL
万方数据