Christoph Orth
ContactDepartment of PhysicsUniversity of Basel Klingelbergstrasse 82 CH4056 Basel, Switzerland

Research interests
 
CV
since February 2012  PhD student under the supervision of Dr. Thomas Schmidt and Prof. Christoph Bruder. 
2006  2011  Undergraduate studies at the University of Heidelberg, Institute for Theoretical Physics. Diploma thesis under the supervision of Prof. Andreas Komnik. 
Publications
Show all abstracts.1.  The topological Anderson insulator phase in the KaneMele model 
Christoph P. Orth (University of Basel), Tibor Sekera (University of Basel), Christoph Bruder (University of Basel), and Thomas L. Schmidt (Luxembourg University). Scientific Reports 6, Article number: 24007 (2016)  
2.  NonAbelian parafermions in timereversalinvariant interacting helical systems 
Christoph P. Orth, Rakesh P. Tiwari, Tobias Meng, and Thomas L. Schmidt. PHYSICAL REVIEW B 91, 081406(R) (2015)  
3.  Point contacts and localization in generic helical liquids 
Christoph P. Orth, Grégory Strübi, and Thomas L. Schmidt. Phys. Rev. B 88, 165315 (2013)
We consider two helical liquids on opposite edges of a narrow twodimensional
topological insulator, which are connected by one or several local tunnel
junctions. In the presence of spatially inhomogeneous Rashba spinorbit
coupling, the spin textures of the helical states on opposite edges are
different. We demonstrate that this has a strong impact on the electron
transport between the edges. In particular, in the case of many random tunnel
contacts, the localization length depends strongly on the spin textures of the
edge states.
 
4.  Finite frequency noise properties of the nonequilibrium Anderson impurity model 
Christoph P. Orth, Daniel F. Urban, and Andreas Komnik. Phys. Rev. B 86, 125324 (2012)
We analyze the spectrum of the electriccurrent autocorrelation function
(noise power) in the Anderson impurity model biased by a finite transport
voltage. Special emphasis is placed on the interplay of nonequilibrium effects
and electronelectron interactions. Analytic results are presented for a
perturbation expansion in the interaction strength $U$. Compared to the
noninteracting setup we find a suppression of noise for finite frequencies in
equilibrium and an amplification in nonequilibrium. Furthermore, we use a
diagrammatic resummation scheme to obtain nonperturbative results in the
regime of intermediate $U$. At finite voltage, the noise spectrum shows sharp
peaks at positions related to the Kondo temperature instead of the voltage.
