2016/10/27 by Eduardo V. Castro, Miguel A. Cazalilla, María A. H. Vozmediano
Materials Science · Physics and Astronomy · #Carbon Nanotubes in Composites #Condensed matter physics #Graphene #Graphene research and applications #Landau quantization #Physics #Quantum and electron transport phenomena #Quantum mechanics #Statistical physics #cond-mat.mes-hall #cond-mat.mtrl-sci #cond-mat.str-el
paper · pdf · doi:10.1103/physrevb.96.241405
published as Phys. Rev. B 96, 241405(R) (2017) · 5 pages, 2 figures
arxiv created 2016/10/27 · openalex created_date 2016/11/04 · openalex publication_date 2017/12/08 · arxiv updated 2018/09/27 · openalex updated_date 2026/08/05
Lattice deformations couple to the low-energy electronic excitations of graphene as vector fields similar to the electromagnetic potential. The observation of strain-induced pseudo Landau levels with scanning tunnel microscopy experiments has been one of the most exciting events in the history of graphene. Nevertheless, the experimental observation presents some ambiguities. Similar strain patterns show different images that are sometimes difficult to interpret. In this Rapid Communication, we show that, for some strain configurations, the deformation potential acts as a parallel electric field able to destabilize the Landau level structure via a mechanism identical to that occurring for real electromagnetic fields. This effect also alters the estimations of the value of the pseudomagnetic field, which can be significantly bigger. The mechanism applies equally if the electric field has an external origin, which opens the door to an electric control of giant pseudomagnetic fields in graphene.