Electronic instability in a zero-gap semiconductor: the charge-density wave in (TaSe4)2I.
نویسندگان
چکیده
We report a comprehensive study of the paradigmatic quasi-1D compound (TaSe(4))(2)I performed by means of angle-resolved photoemission spectroscopy (ARPES) and first-principles electronic structure calculations. We find it to be a zero-gap semiconductor in the nondistorted structure, with non-negligible interchain coupling. Theory and experiment support a Peierls-like scenario for the charge-density wave formation below T(CDW)=263 K, where the incommensurability is a direct consequence of the finite interchain coupling. The formation of small polarons, strongly suggested by the ARPES data, explains the puzzling semiconductor-to-semiconductor transition observed in transport at T(CDW).
منابع مشابه
The spectral , structural and transport properties of the pseudogap system ( TaSe 4 ) 2 I
The room temperature “metallic” properties of the quasi-one-dimensional charge density wave system (TaSe4)2I differ markedly from those expected of either a Fermi or a Luttinger Liquid. We discuss evidence for the simplest possible explanation of the observed behavior of (TaSe4)2I in its conducting phase — namely the existence of large quasi–static fluctuations of structural order, which howeve...
متن کاملCharge density wave transport in inorganic linear chain compounds
2014 In quasi-one dimensional inorganic conductors such as the transition metal trichalcogenides NbSe3, TaS3, the tetrachalcogenides (TaSe4)2I, (NbSe4)10/3I and the molybdenum blue bronzes A0.30MoO3 (A = K, Rb, T1) a new collective transport by the macroscopic sliding of a so-called charge density wave through the lattice has been reported. We review the structural and electronic properties of ...
متن کاملInterpretation of Photoemission Spectra of (TaSe4)2I as Evidence of Charge Density Wave Fluctuations
The competition between different and unusual effects in quasi-onedimensional conductors makes the direct interpretation of experimental measurements of these materials both difficult and interesting. We consider evidence for the existence of large charge-density-wave fluctuations in the conducting phase of the Peierls insulator (TaSe4)2I, by comparing the predictions of a simple Lee, Rice and ...
متن کامل1 2 A pr 1 99 9 Electronic properties of the pseudogap system ( TaSe 4 ) 2
The room temperature “metallic” properties of the quasi-one-dimensional material (TaSe4)2I differ markedly from those expected of either a Fermi or a Luttinger Liquid, showing strong signs of a suppression of the density of states at the Fermi level. We present evidence for the existence of strong quasi–static fluctuations of structural order with long correlation length. These fluctuations pro...
متن کاملFirst-Principles Study of Structure, Electronic and Optical Properties of HgSe in Zinc Blende (B3) Phase
In this paper, the structural parameters, energy bands structure, density ofstates and charge density of HgSe in the Zincblende(B3) phase have been investigated.The calculations have been performed using the Pseudopotential method in theframework of density functional theory (DFT) by Quantum Espresso package. Theresults for the electronic density of states (DOS) show tha...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
- Physical review letters
دوره 110 23 شماره
صفحات -
تاریخ انتشار 2013