[Mesurer la phase de Berry du graphène en l’absence de champ magnétique]
Les interférences de quasiparticules observées par microscopie à effet tunnel sont particulièrement utiles pour étudier les propriétés électroniques de matériaux en surfaces. Ces interférences possèdent des informations sur la surface de Fermi du système et leur résolution en énergie permet, dans certains cas, de reconstruire la relation dispersion. Nous montrons ici que les images d’interférences de quasiparticules peuvent aussi contenir une information sur la phase de Berry qui caractérise la structure de bande du matériau. La phase de Berry est une phase géométrique que les fonctions d’onde electroniques acquièrent lors d’une évolution cyclique dans un espace de paramètres. Elle est quantifiée lorsque la trajectoire de l’évolution ensèrre une singularité des fonctions d’onde. Il s’agit alors d’une propriété topologique de la structure de bande. La phase de Berry dans les solides est traditionnellement mesurée en appliquant des champs électromagnétiques pour forcer les particules à former de trajectoires fermées. L’utilisation de la figure d’interférence de quasiparticules permet de s’extraire de ce paradigme car la phase de Berry peut affecter la réponse statique des électrons au désordre en l’absence de champ électromagnétique.
The Berry phase of wave functions is a key quantity to understand various low-energy properties of matter, among which electric polarisation, orbital magnetism, as well as topological and ultra-relativistic phenomena. Standard approaches to probe the Berry phase in solids rely on the electron dynamics in response to electromagnetic forces. In graphene, probing the Berry phase of the massless relativistic electrons requires an external magnetic field. Here, we show that the Berry phase also affects the static response of the electrons to a single atomic scatterer, through wavefront dislocations in the surrounding standing-wave interference. This provides a new experimental method to measure the graphene Berry phase in the absence of any magnetic field and demonstrates that local disorder can be exploited as probe of topological quantum matter in scanning tunnelling microscopy experiments.
Publié le :
Mot clés : Phase de Berry, Graphène, Microscope à effet tunnel, Topologie, Interférence de quasi-particules, Défaut atomique
CC-BY 4.0
@article{CRPHYS_2021__22_S4_133_0,
author = {Cl\'ement Dutreix and Hector Gonz\'alez-Herrero and Ivan Brihuega and Mikhail~I. Katsnelson and Claude Chapelier and Vincent T. Renard},
title = {Measuring graphene{\textquoteright}s {Berry} phase at $B=0${~T}},
journal = {Comptes Rendus. Physique},
pages = {133--143},
publisher = {Acad\'emie des sciences, Paris},
volume = {22},
number = {S4},
year = {2021},
doi = {10.5802/crphys.79},
language = {en},
}
TY - JOUR AU - Clément Dutreix AU - Hector González-Herrero AU - Ivan Brihuega AU - Mikhail I. Katsnelson AU - Claude Chapelier AU - Vincent T. Renard TI - Measuring graphene’s Berry phase at $B=0$ T JO - Comptes Rendus. Physique PY - 2021 SP - 133 EP - 143 VL - 22 IS - S4 PB - Académie des sciences, Paris DO - 10.5802/crphys.79 LA - en ID - CRPHYS_2021__22_S4_133_0 ER -
%0 Journal Article %A Clément Dutreix %A Hector González-Herrero %A Ivan Brihuega %A Mikhail I. Katsnelson %A Claude Chapelier %A Vincent T. Renard %T Measuring graphene’s Berry phase at $B=0$ T %J Comptes Rendus. Physique %D 2021 %P 133-143 %V 22 %N S4 %I Académie des sciences, Paris %R 10.5802/crphys.79 %G en %F CRPHYS_2021__22_S4_133_0
Clément Dutreix; Hector González-Herrero; Ivan Brihuega; Mikhail I. Katsnelson; Claude Chapelier; Vincent T. Renard. Measuring graphene’s Berry phase at $B=0$ T. Comptes Rendus. Physique, Volume 22 (2021) no. S4, pp. 133-143. doi : 10.5802/crphys.79. https://comptes-rendus.academie-sciences.fr/physique/articles/10.5802/crphys.79/
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