Theory of diamagnetic susceptibility of interacting electrons in solids

Hugues Nélisse, C. Bourbonnais, Yu. M. Vil’k +2 more

Fedor Vasilievich Kusmartsev

Harjinder Singh, K. N. Pathak

The effects of exchange and correlations on the diamagnetic susceptibility of an interacting electron gas are investigated using the double-time Green's-function method. The equation of motion of the appropriate Green's function is linearized using a moment-conserving decoupling approximation. The many-body corrections to the diamagnetic susceptibility at metallic densities are found to be small. The present expression reduces to the exact result in the high-density limit. Many of the results of earlier calculations also follow from our expression for the diamagnetic susceptibility.

Vladimir A. Zyuzin, Dmitrii L. Maslov

Subrata Chakraborty, So Takei

A complete theory of the orbital magnetic susceptibility of an isolated multiband electron system was developed in 2015. Here, the authors study whether one can control this orbital susceptibility by opening the electron system to a fermionic bath. They show that, as the system-bath coupling is increased, a properly engineered bath can enhance the diamagnetic susceptibility of the system and even change its orbital paramagnetic response into a diamagnetic one. The work also discusses how a Van Hove singularity in the bath density of states can be exploited to generate a giant enhancement of the orbital magnetic response. These results are counterintuitive, relative to the common belief, that bath-induced decoherence merely leads to the quenching of the orbital magnetic susceptibility.

A. R. P. Rau, A. K. Rajagopal