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Revealing topological Dirac fermions at the surface of strained HgTe thin films via Quantum Hall transport spectroscopy
C. Thomas, O. Crauste, B. Haas +7
We demonstrate evidences of electronic transport via topological Dirac surface states in a thin film of strained HgTe. At high perpendicular magnetic fields, we show that the elect…
Diffusion of Dirac fermions across a topological merging transition in two dimensions
P. Adroguer, D. Carpentier, G. Montambaux +1
A continuous deformation of a Hamiltonian possessing at low energy two Dirac points of opposite chiralities can lead to a gap opening by merging of the two Dirac points. In two dim…
Effect of disorder on 2D topological merging transition from a Dirac semi-metal to a normal insulator
David Carpentier, Andrei A. Fedorenko, Edmond Orignac
We study the influence of disorder on the topological transition from a two-dimensional Dirac semi-metal to an insulating state. This transition is described as a continuous mergin…
Diffusion at the Surface of Topological Insulators
Pierre Adroguer, David Carpentier, Jérôme Cayssol +1
We consider the transport properties of topological insulators surface states in the presence of uncorrelated point-like disorder, both in the classical and quantum regimes. The tr…
Two dimensional Dirac fermions in the presence of long-range correlated disorder
Andrei A. Fedorenko, David Carpentier, Edmond Orignac
We consider 2D Dirac fermions in the presence of three types of disorder: random scalar potential, random gauge potential and random mass with long-range correlations decaying as a…
Probing the helical edge states of a topological insulator by Cooper-pair injection
P. Adroguer, C. Grenier, D. Carpentier +3
We consider the proximity effect between a singlet s-wave superconductor and the edge of a Quantum Spin Hall (QSH) topological insulator. We establish that Andreev reflection at a…
Phase transitions in the boson-fermion resonance model in one dimension
Edmond Orignac, Roberta Citro
We study 1D fermions with photoassociation or with a narrow Fano-Feshbach resonance described by the Boson-Fermion resonance model. Using thebosonization technique, we derive a low…
Disordered Quantum smectics
E. Orignac, R. Chitra
We study the impurity pinning of the Quantum Hall (QH) smectic state arising in two dimensional electron systems in high Landau levels. We use replicas and a Gaussian Variational m…