The ball-milled mixture of Ti and Se powders was carried out a solid -phase reaction at600℃.The as-prepared sample had been characterized by X -ray diffraction(XRD),scanning electron microscopy(SEM),transmission elec...The ball-milled mixture of Ti and Se powders was carried out a solid -phase reaction at600℃.The as-prepared sample had been characterized by X -ray diffraction(XRD),scanning electron microscopy(SEM),transmission elec tron microscopy(TEM)and high-resolution transmission electron microscopy(HRT EM).The result shows that the products are multiwalled TiSe 2 nanotubes with open-ended tips,which are about15nm in outer diameter,se veral micron in lengths,and0.6nm of interlayer spacing.展开更多
By using scanning tunneling microscopy(STM)/spectroscopy(STS), we systematically characterize the electronic structure of lightly doped 1 T-TiSe_2, and demonstrate the existence of the electronic inhomogeneity and the...By using scanning tunneling microscopy(STM)/spectroscopy(STS), we systematically characterize the electronic structure of lightly doped 1 T-TiSe_2, and demonstrate the existence of the electronic inhomogeneity and the pseudogap state. It is found that the intercalation induced lattice distortion impacts the local band structure and reduce the size of the charge density wave(CDW) gap with the persisted 2 × 2 spatial modulation. On the other hand, the delocalized doping electrons promote the formation of pseudogap. Domination by either of the two effects results in the separation of two characteristic regions in real space, exhibiting rather different electronic structures. Further doping electrons to the surface confirms that the pseudogap may be the precursor for the superconducting gap. This study suggests that the competition of local lattice distortion and the delocalized doping effect contribute to the complicated relationship between charge density wave and superconductivity for intercalated 1 T-TiSe_2.展开更多
文摘The ball-milled mixture of Ti and Se powders was carried out a solid -phase reaction at600℃.The as-prepared sample had been characterized by X -ray diffraction(XRD),scanning electron microscopy(SEM),transmission elec tron microscopy(TEM)and high-resolution transmission electron microscopy(HRT EM).The result shows that the products are multiwalled TiSe 2 nanotubes with open-ended tips,which are about15nm in outer diameter,se veral micron in lengths,and0.6nm of interlayer spacing.
基金supported by the Ministry of Science and Technology of China(2014CB921103,2013CB922103,2016YFA0300400,2015CB921202)the National Natural Science Foundation of China(11774149,11374140,11190023,11774152,51372112,11574133)+1 种基金NSF Jiangsu Province(BK20150012)the Open Research Fund Program of the State Key Laboratory of Low-Dimensional Quantum Physics
文摘By using scanning tunneling microscopy(STM)/spectroscopy(STS), we systematically characterize the electronic structure of lightly doped 1 T-TiSe_2, and demonstrate the existence of the electronic inhomogeneity and the pseudogap state. It is found that the intercalation induced lattice distortion impacts the local band structure and reduce the size of the charge density wave(CDW) gap with the persisted 2 × 2 spatial modulation. On the other hand, the delocalized doping electrons promote the formation of pseudogap. Domination by either of the two effects results in the separation of two characteristic regions in real space, exhibiting rather different electronic structures. Further doping electrons to the surface confirms that the pseudogap may be the precursor for the superconducting gap. This study suggests that the competition of local lattice distortion and the delocalized doping effect contribute to the complicated relationship between charge density wave and superconductivity for intercalated 1 T-TiSe_2.
