电学性能:半金属,电荷密度波(CDW)晶体结构:六边形晶胞参数:a = b = 0.354 nm, c = 0.601 nm, α = β = 90°, γ = 120°晶体类型:合成晶体纯度:>99.995% X-ray diffraction on a TiSe2 single crystal aligned along the (001) plane. XRD was performed at room temperature using a D8 Venture...
其中红色散点标记了导带,橙色散点标记了位于CDW能隙(灰色区域)间的电子-激子耦合导致的隙间态。红色实线为抛物线拟合。垂直的黑色虚线标记了布拉格点的位置。 双层1T-TiSe2中的电子-激子耦合 研究背景 在半导体中,当电子与空穴形成激子的能量收益大于带隙时,系统在低温下凝聚成激子绝缘相。在半金属中,当导带和价带...
电学性能:半金属,电荷密度波(CDW)晶体结构:六边形晶胞参数:a = b = 0.354 nm, c = 0.601 nm, α = β = 90°, γ = 120°晶体类型:合成晶体纯度:>99.995%X-ray diffraction on a TiSe2 single crystal aligned along the (001) plane. XRD was performed at room temperature using a D8 Venture ...
We found that the formation of the charge density wave (CDW) in 1 T -TiSe 2 at~205K is accompanied by a significant increase of the band gap, supporting the existence of excitonic pairing in the CDW state of 1 T -TiSe 2 . More importantly, by analyzing the linewidth of the single...
The electronic band structure in the CDW state (superlattice structure) of 1T-TiSe 2 is calculated on the basis of the band-type Jahn-Teller model by extending our theory of lattice instability in the normal phase. A strong coupling between the hole-band (Se p states) around the 螞 point...
Physical properties of the CDW state of 1T-TiSesuch as electronic band structures are investigated on the basis of the band-type Jahn-Teller model by extending our microscopic theory of lattice instability in the normal phase. The results are summarized as follows: (i) The triple-q CDW state...
All-electron ab initio calculations are used to study the microscopic origin of the charge density wave (CDW) in 1T-TiSe2. A purely electronic picture is ruled out as a possible scenario, indicating that the CDW transition in the present system is merely a structural phase transition. The CDW...
We found that a pseudogap emerges at the Fermi level, prior to the superconductivity transition, which is more prominent in the CDW “normal” regions. We attribute the decrease of CDW gap to the local lattice distortion induced by the intercalated atoms, and the formation of pseudogap to the...
To better understand this connection, we used high-pressure X-ray scattering to directly study the CDW order in the layered dichalcogenide TiSe, which was previously shown to exhibit superconductivity when the CDW is suppressed by pressure or intercalation of Cu atoms. We succeeded in suppressing ...
(CDW) states with scanning tunnelling microscopy. When the twist angle is near zero degrees, 2 × 2 CDW domains are formed in 1T-TiTe2, separated by 1 × 1 normal state domains, and trapped in the moiré pattern. The formation of the moiré-trapped CDW state is ascribed to ...