Field and temperature dependence of intrinsic diamagnetism in graphene: Theory and experiment

Abstract

Intrinsic diamagnetism of graphene is studied both theoretically and experimentally, to unravel the magnetic response of chiral massless fermions. Comprehensive formulas predicting the variation of graphene magnetization with magnetic field and temperature are developed. Graphene magnetization M at low temperatures is particularly large and M ∝ − √ B, intrinsically different from normal materials. The quantum Berry phase of π and linear energy dispersion are responsible for this intriguing macroscopic behavior. The temperature dependence of magnetization is successfully formulated by a Langevin-like function. The de Haas-van Alphen oscillations are predicted in the case of doping. Correspondingly, experiments at different temperatures are conducted on highly pure, mass-produced graphene flakes derived from SiC single crystals, which exhibit very strong diamagnetism. The measured results agree well with the theoretical ones in both magnitude and trend.

Study on magnetic properties of a nano-graphene bilayer

“…The temperature dependence of magnetization for graphene is successfully expressed by a Langevin-like function. Graphene magnetization at low temperatures is particularly large, intrinsically different from normal materials [8]. Mohammadi et al apply the Anderson impurity model to consider the local moment of bilayer graphene.…”

Thermal bridging of graphene nanosheets via covalent molecular junctions: A non-equilibrium Green’s functions–density functional tight-binding study

“…In the last decade, a great deal of research interest was focused on graphene, due to its high thermal and electrical conductivity [13][14][15][16], optical [17,18] and magnetic [19] properties. In terms of thermal conductivity, graphene was reported both experimentally and theoretically in the range between 1000 and 5000 W/mK [20], depending on the used experimental technique or computational method.…”

Orbital magnetic susceptibility of graphene andMoS2

“…It is thus worthwhile to count on a detailed characterization of their magnetic response through the discussion of the magnetic susceptibility. Moreover, the availability of experimental techniques involving highly pure graphene flakes encourage our study as liable to be tested [25].…”