对TiSe2最近ARPES测量的另一种解释
An Alternative Interpretation of Recent ARPES Measurements on TiSe2
摘要：
最近有一个新的兴趣在电荷密度波过渡的TiSe 2，燃料的可能性，这种转变可能是由激子绝缘体，甚至激子凝聚体的形成驱动。我们在这里表明，最近的ARPES测量TiSe 2也可以解释在一个替代方案，其中过渡是由于结合的Jahn-Teller效应和激子形成。导致CDW形成的混合激子-声子介于纯结构型和纯电子型跃迁之间。在转变温度以上，电子-声子耦合变得无效，但激子的有限平均场密度仍然存在，并产生所观察到的扩散ARPES信号。
英文摘要：
Recently there has been a renewed interest in the charge density wave transition of TiSe2, fuelled by the possibility that this transition may be driven by the formation of an excitonic insulator or even an excitonic condensate. We show here that the recent ARPES measurements on TiSe2 can also be interpreted in terms of an alternative scenario, in which the transition is due to a combination of Jahn-Teller effects and exciton formation. The hybrid exciton-phonons which cause the CDW formation interpolate between a purely structural and a purely electronic type of transition. Above the transition temperature, the electron-phonon coupling becomes ineffective but a finite mean-field density of excitons remains and gives rise to the observed diffuse ARPES signals.
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