Phase separation and long-wavelength charge instabilities in spin-orbit coupled systems

  • We investigate a two-dimensional electron model with Rashba spin-orbit interaction where the coupling constant $g=g(n)$ depends on the electronic density. It is shown that this dependence may drive the system unstable towards a long-wavelength charge density wave (CDW) where the associated second-order instability occurs in close vicinity to global phase separation. For very low electron densities the CDW instability is nesting-induced and the modulation follows the Fermi momentum kF. At higher density the instability criterion becomes independent of kF and the system may become unstable in a broad momentum range. Finally, upon filling the upper spin-orbit split band, finite momentum instabilities disappear in favor of phase separation alone. We discuss our results with regard to the inhomogeneous phases observed at the LaAlO3/SrTiO3 or LaTiO3/SrTiO3 interfaces.

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Metadaten
Author: Götz Seibold, Daniel Bucheli, Sergio CapraraORCiD, Marco GrilliORCiD
URL:http://iopscience.iop.org/article/10.1209/0295-5075/109/17006;jsessionid=34AAE2057398BD7AE51C0C4719FC29DD.c2.iopscience.cld.iop.org
DOI:https://doi.org/10.1209/0295-5075/109/17006
ISSN:1286-4854
Title of the source (English):EPL Europhysics Letters
Document Type:Scientific journal article peer-reviewed
Language:English
Year of publication:2015
Volume/Year:109
Issue number:1
First Page:17006
Faculty/Chair:Fakultät 1 MINT - Mathematik, Informatik, Physik, Elektro- und Informationstechnik / FG Computational Physics
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