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Observation of correlated spin-orbit order in a strongly anisotropic quantum wire system

Brand, C and Pfnuer, H and Landolt, G and Muff, S and Dil, JH and Das, Tanmoy and Tegenkamp, Christoph (2015) Observation of correlated spin-orbit order in a strongly anisotropic quantum wire system. In: NATURE COMMUNICATIONS, 6 .

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Official URL: http://dx.doi.org/10.1038/ncomms9118


Quantum wires with spin-orbit coupling provide a unique opportunity to simultaneously control the coupling strength and the screened Coulomb interactions where new exotic phases of matter can be explored. Here we report on the observation of an exotic spin-orbit density wave in Pb-atomic wires on Si(557) surfaces by mapping out the evolution of the modulated spin-texture at various conditions with spin-and angle-resolved photoelectron spectroscopy. The results are independently quantified by surface transport measurements. The spin polarization, coherence length, spin dephasing rate and the associated quasiparticle gap decrease simultaneously as the screened Coulomb interaction decreases with increasing excess coverage, providing a new mechanism for generating and manipulating a spin-orbit entanglement effect via electronic interaction. Despite clear evidence of spontaneous spin-rotation symmetry breaking and modulation of spin-momentum structure as a function of excess coverage, the average spin polarization over the Brillouin zone vanishes, indicating that time-reversal symmetry is intact as theoretically predicted.

Item Type: Journal Article
Additional Information: Copy right for this article belongs to the NATURE PUBLISHING GROUP, MACMILLAN BUILDING, 4 CRINAN ST, LONDON N1 9XW, ENGLAND
Department/Centre: Division of Physical & Mathematical Sciences > Physics
Date Deposited: 12 Nov 2015 05:09
Last Modified: 12 Nov 2015 05:09
URI: http://eprints.iisc.ac.in/id/eprint/52729

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