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.
Author: | Götz SeiboldORCiD, Daniel Bucheli, Sergio CapraraORCiD, Marco GrilliORCiD |
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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 |