Electron-hole coupling and the charge density wave transition in TiSe2 -: art. no. 226402
Electron-hole coupling and the charge density wave transition in TiSe2 -: art. no. 226402
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DOI：
10.1103/physrevlett.88.226402
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发表时间：
2002-06-03
影响因子：
8.6
通讯作者：
Chiang, TC
中科院分区：
文献类型：
--
作者：
Kidd, TE;Miller, T;Chiang, TC
利用角分辨光电子能谱（Angle-resolved photoemission）测量了TiSe_2的能带结构，以阐明（2x2 x2）电荷密度波跃迁的本质。结果表明，在布里渊区的不同位置处，正常相位中非常小的间接带隙转变为较大的间接带隙。费米表面拓扑在这种情况下是无关紧要的。相反，电子-空穴耦合与一种新的间接Jahn-Teller效应一起驱动了跃迁。
Angle-resolved photoemission is employed to measure the band structure of TiSe2 in order to clarify the nature of the (2x2x2 ) charge density wave transition. The results show a very small indirect gap in the normal phase transforming into a larger indirect gap at a different location in the Brillouin zone. Fermi surface topology is irrelevant in this case. Instead, electron-hole coupling together with a novel indirect Jahn-Teller effect drives the transition.