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

Research output: Contribution to journalArticleResearchpeer review

Authors

  • C. Brand
  • Herbert Pfnür
  • G. Landolt
  • S. Muff
  • Jan Hugo Dil
  • Tanmoy Das
  • Christoph Tegenkamp

Research Organisations

External Research Organisations

  • Universität Zürich (UZH)
  • Paul Scherrer Institut (PSI)
  • École polytechnique fédérale de Lausanne (EPFL)
  • Indian Institute of Science Bangalore
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Details

Original languageEnglish
Article number8118
JournalNature Communications
Volume6
Publication statusPublished - 10 Sept 2015

Abstract

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.

ASJC Scopus subject areas

Cite this

Observation of correlated spin-orbit order in a strongly anisotropic quantum wire system. / Brand, C.; Pfnür, Herbert; Landolt, G. et al.
In: Nature Communications, Vol. 6, 8118, 10.09.2015.

Research output: Contribution to journalArticleResearchpeer review

Brand C, Pfnür H, Landolt G, Muff S, Dil JH, Das T et al. Observation of correlated spin-orbit order in a strongly anisotropic quantum wire system. Nature Communications. 2015 Sept 10;6:8118. doi: 10.1038/ncomms9118
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AU - Pfnür, Herbert

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AU - Muff, S.

AU - Dil, Jan Hugo

AU - Das, Tanmoy

AU - Tegenkamp, Christoph

N1 - Funding information: The financial support by the Deutsche Forschungsgemeinschaft (DFG) through FOR1700 and the Swiss National Science Foundation (project no. PP00P2 1447421) is gratefully acknowledged. We also like to thank Monika Jäger for performing some of the STM experiments.

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