Controlling the self-doping of YBa2C3O7-d polar surfaces: From Fermi surface to nodal Fermi arcs by ARPES

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dc.creatorHossain, M. A.
dc.creatorMottershead, J. D. F.
dc.creatorBostwick, A.
dc.creatorMcChesney, J. L.
dc.creatorRotenberg, E.
dc.creatorLiang, R.
dc.creatorHardy, W. N.
dc.creatorSawatzky, G. A.
dc.creatorElfimov, I. S.
dc.creatorBonn, D. A.
dc.creatorDamascelli, A.
dc.date2008-01-22
dc.date.accessioned2026-07-07T09:48:08Z
dc.date.available2026-07-07T09:48:08Z
dc.descriptionThe discovery of quantum oscillations in the normal-state electrical resistivity of YBa2Cu3O6.5 provides the first evidence for the existence of Fermi surface (FS) pockets in an underdoped cuprate. However, the pockets' electron vs. hole character, and the very interpretation in terms of closed FS contours, are the subject of considerable debate. Angle-resolved photoemission spectroscopy (ARPES), with its ability to probe electronic dispersion as well as the FS, is ideally suited to address this issue. Unfortunately, the ARPES study of YBa2C3O7-d (YBCO) has been hampered by the technique's surface sensitivity. Here we show that this stems from the polarity and corresponding self-doping of the YBCO surface. By in-situ deposition of potassium atoms on the cleaved surface, we are able to continuously tune the doping of a single sample from the heavily overdoped to the underdoped regime. This reveals the progressive collapse of the normal-metal-like FS into four disconnected nodal FS arcs, or perhaps into hole but not electron pockets, in underdoped YBCO6.5.
dc.descriptionA high-resolution version can be found at http://www.physics.ubc.ca/~quantmat/ARPES/PUBLICATIONS/Articles/YBCO_polar_ARPES.pdf
dc.identifierhttps://arxiv.org/abs/0801.3421
dc.identifierhttp://arxiv.org/abs/0801.3421
dc.identifierNature Physics 4, 527 (2008).
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/164102
dc.subjectSuperconductivity
dc.subjectStrongly Correlated Electrons
dc.titleControlling the self-doping of YBa2C3O7-d polar surfaces: From Fermi surface to nodal Fermi arcs by ARPES
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