Zero differential resistance state of two dimensional electron systems in strong magnetic fields

TL;DR

This paper reports the discovery of a zero differential resistance state in two-dimensional electron systems under strong magnetic fields and low temperatures, linked to nonlinear current behavior and electron redistribution.

Contribution

It introduces the observation of a zero differential resistance state in 2D electron systems and suggests a new mechanism involving electron redistribution as its cause.

Findings

Zero differential resistance state appears above a threshold current.

The state is temperature-dependent and disappears above several Kelvins.

The system shows inhomogeneous, non-stationary current patterns at the threshold.

Abstract

Zero differential resistance state is found in response to direct current applied to 2D electron systems at strong magnetic field and low temperatures. Transition to the state is accompanied by sharp dip of negative differential resistance, which occurs above threshold value $I_{th}$ of the direct current. The state depends significantly on the temperature and is not observable above several Kelvins. Additional analysis shows lack of the linear stability of the 2D electron systems at $I>I_{th}$ and inhomogeneous, non-stationary pattern of the electric current in the zero differential resistance state. We suggest that the dc bias induced redistribution of the 2D electrons in energy space is the dominant mechanism leading to the new electron state.