Evidence for a New Dissipationless Regime in 2D Electronic Transport

TL;DR

This paper reports the discovery of a potentially new dissipationless state in ultra-clean 2D electron systems under specific microwave and magnetic field conditions, suggesting a novel collective ground state.

Contribution

It provides evidence for a new dissipationless regime in 2D electronic transport, characterized by exponentially vanishing resistance and high activation energies, indicating a previously unknown collective ground state.

Findings

Emergence of dissipationless states away from cyclotron resonances

Exponential suppression of low-temperature resistance

Activation energies surpass Landau level spacing

Abstract

In an ultra-clean 2D electron system (2DES) subjected to crossed millimeterwave (30--150 GHz) and weak (B < 2 kG) magnetic fields, a series of apparently dissipationless states emerges as the system is detuned from cyclotron resonances. Such states are characterized by an exponentially vanishing low-temperature longitudinal resistance and a classical Hall resistance. The activation energies associated with such states exceeds the Landau level spacing by an order of magnitude. Our findings are likely indicative of a collective ground state previously unknown for 2DES.