Magneto-exciton limit of quantum Hall breakdown in graphene

• DOI: 10.48550/arxiv.2302.14791
• Publication Date: 2023-08-31
• Authors: A. Schmitt; M. Rosticher; T. Taniguchi; K. Watanabe; J. M. Berroir; G. Ménard; C. Voisin; G. Fève; M. O. Goerbig; B. Plaçais; E. Baudin
• Keywords: Condensed Matter - Mesoscale and Nanoscale Physics; 0103 physical sciences; Mesoscale and Nanoscale Physics (cond-mat.mes-hall); FOS: Physical sciences; 01 natural sciences; [PHYS.COND.CM-MSQHE]Physics [physics]/Condensed Matter [cond-mat]/Mesoscopic Systems and Quantum Hall Effect [cond-mat.mes-hall]

One of the intrinsic drift velocity limit of the quantum Hall effect is the collective magneto-exciton (ME) instability. It has been demonstrated in bilayer graphene (BLG) using noise measurements. We reproduce this experiment in monolayer graphene (MLG), and show that the same mechanism carries a direct relativistic signature on the breakdown velocity. Based on theoretical calculations of MLG- and BLG-ME spectra, we show that Doppler-induced instabilities manifest for a ME phase velocity determined by a universal value of the ME conductivity, set by the Hall conductance.<br/>27 pages, 11 figures including supplementary information (14 pages and 3 figures for the main text alone)<br/>