Evidence for Charge-Density-Wave in Underdoped Bi2201 from ARPES and LEED

Details Evidence for Charge-Density-Wave in Underdoped Bi2201 from ARPES and LEED Evidence for Charge-Density-Wave in Underdoped Bi2201 from ARPES and LEED

2011-11-11

arxiv.org/abs/1111.2673v1

Physics

Condensed Matter

Superconductivity

A high-resolution version can be found at http://www.physics.ubc.ca/~quantmat/ARPES/PUBLICATIONS/Articles/Bi2201_PG_Q2.pdf

Scientific paper

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.

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