Christoph Orth


Department of Physics
University of Basel
Klingelbergstrasse 82
CH-4056 Basel, Switzerland
office:Office 4.13

email:view address

tel: ++41 (0)61 267 36 53

Research interests


since February 2012PhD 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.


Show all abstracts.

1.  The topological Anderson insulator phase in the Kane-Mele 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.  Non-Abelian parafermions in time-reversal-invariant 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 two-dimensional topological insulator, which are connected by one or several local tunnel junctions. In the presence of spatially inhomogeneous Rashba spin-orbit 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 non-equilibrium Anderson impurity model
Christoph P. Orth, Daniel F. Urban, and Andreas Komnik.
Phys. Rev. B 86, 125324 (2012)

We analyze the spectrum of the electric-current autocorrelation function (noise power) in the Anderson impurity model biased by a finite transport voltage. Special emphasis is placed on the interplay of non-equilibrium effects and electron-electron interactions. Analytic results are presented for a perturbation expansion in the interaction strength $U$. Compared to the non-interacting setup we find a suppression of noise for finite frequencies in equilibrium and an amplification in non-equilibrium. Furthermore, we use a diagrammatic resummation scheme to obtain non-perturbative 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.