## The self-consistent quantum-electrostatic problem in strongly non-linear regime

Pacome Armagnat, A. Lacerda-Santos, Benoit Rossignol, Christoph Groth, Xavier Waintal

SciPost Phys. 7, 031 (2019) · published 11 September 2019

- doi: 10.21468/SciPostPhys.7.3.031
- Submissions/Reports

### Abstract

The self-consistent quantum-electrostatic (also known as Poisson-Schr\"odinger) problem is notoriously difficult in situations where the density of states varies rapidly with energy. At low temperatures, these fluctuations make the problem highly non-linear which renders iterative schemes deeply unstable. We present a stable algorithm that provides a solution to this problem with controlled accuracy. The technique is intrinsically convergent including in highly non-linear regimes. We illustrate our approach with (i) a calculation of the compressible and incompressible stripes in the integer quantum Hall regime and (ii) a calculation of the differential conductance of a quantum point contact geometry. Our technique provides a viable route for the predictive modeling of the transport properties of quantum nanoelectronics devices.

### Ontology / Topics

See full Ontology or Topics database.### Authors / Affiliation: mappings to Contributors and Organizations

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^{1 }Pacome Armagnat, -
^{1 }A. Lacerda-Santos, -
^{1 }Benoit Rossignol, -
^{1 }Christoph Groth, -
^{1 }Xavier Waintal