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20 April 2024

» arxiv » 1111.2673

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Evidence for Charge-Density-Wave in Underdoped Bi2201 from ARPES and LEED
J.A. Rosen ; R. Comin ; G. Levy ; D. Fournier ; Z.-H. Zhu ; B. Ludbrook ; C.N. Veenstra ; D.Wong ; P. Dosanjh ; Y. Yoshida ; H. Eisaki ; L. Petaccia ; A. Damascelli ;
Date:	11 Nov 2011
Abstract:	While there is mounting evidence for a broken symmetry in the pseudogap state of the high-Tc cuprates, the identification of a specific phase remains elusive. Through the combination of electronic (ARPES) and structural (LEED) probes, we uncover a temperature dependent evolution of the CuO2 plane band dispersion in highly-ordered Bi2201, which is directly associated with a hitherto-undetected evolution of the incommensurate superstructure. The quasilinear, continuous variation of the modulation wavelength 2pi/Q_2 from 66 to 43A, below a characteristic T_Q_2=130K, provides evidence for an electronically-driven charge-density-wave ordering. This points to a remarkable electron-lattice coupling, in which the footprint of the BiO-layer-induced superstructure is found in the modulated electronic structure of the CuO2 plane.
Source:	arXiv, 1111.2673
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