Reference : Structure factor of interacting one-dimensional helical systems
 Document type : Scientific journals : Article Discipline(s) : Physical, chemical, mathematical & earth Sciences : Physics To cite this reference: http://hdl.handle.net/10993/20076
 Title : Structure factor of interacting one-dimensional helical systems Language : English Author, co-author : Gangadharaiah, Suhas [> >] Schmidt, Thomas [University of Basel > Department of Physics] Loss, Daniel [> >] Publication date : 2014 Journal title : Phys. Rev. B Volume : 89 Pages : 035131 Peer reviewed : Yes Abstract : [en] We calculate the dynamical structure factor $S(q,\omega)$ of a weakly interacting helical edge state in the presence of a magnetic field $B$. The latter opens a gap of width $2B$ in the single-particle spectrum, which becomes strongly nonlinear near the Dirac point. For chemical potentials $|\mu|>B$, the system then behaves as a nonlinear helical Luttinger liquid, and a mobile-impurity analysis reveals power-law singularities in $S(q,\omega)$ which depend on the interaction strength as well as on the spin texture of the edge states. For \$|\mu|

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