Resistively detected nuclear magnetic resonance via a single InSb two-dimensional electron gas at high temperature

TL;DR

This paper demonstrates resistively detected nuclear magnetic resonance (RDNMR) in a single InSb 2DEG at temperatures up to 4 K, highlighting the role of large energy scales in maintaining the signal.

Contribution

It presents the first RDNMR observation in InSb 2DEG at elevated temperatures, revealing unique peak-dip line shapes and temperature-independent nuclear relaxation times.

Findings

RDNMR signal persists up to 4 K in InSb 2DEG.

Distinct peak-dip line shape observed in RDNMR.

Nuclear relaxation time T1 is temperature independent.

Abstract

We report on the demonstration of the resistively detected nuclear magnetic resonance (RDNMR) of a single InSb two-dimensional electron gas (2DEG) at elevated temperatures up to 4 K. The RDNMR signal of 115In in the simplest pseudospin quantum Hall ferromagnet triggered by a large direct current shows a peak-dip line shape, where the nuclear relaxation time T1 at the peak and the dip is different but almost temperature independent. The large Zeeman, cyclotron, and exchange energy scales of the InSb 2DEG contribute to the persistence of the RDNMR signal at high temperatures.