2009Physical Review B

Breakdown of the N = 0 quantum Hall state in graphene: Two insulating regimes

L. Zhang, J. Camacho, H. Cao, Y. P. Chen, M. Khodas, D. E. Kharzeev, A. M. Tsvelik, T. Valla, I. A. Zaliznyak

Physical Review B · 80, 241412 (2009)

**AI thematic illustration**Concept artwork created for this paper.

Introduction

Measurements up to 18 T follow graphene towards charge neutrality. At lower filling, a regime consistent with localized transport gives way near filling one-half to a cusp and a still steeper rise in longitudinal resistance.

A closer reading

Following both longitudinal and Hall resistivity distinguishes the two regimes better than a rising resistance alone. A pinned Wigner crystal is proposed as a candidate for the collective insulating state; the transport measurements do not directly resolve such an ordered structure.