Transport of indirect excitons and exciton mediated spin transport in a van der Waals heterostructure in magnetic fields

TL;DR

This paper investigates the transport properties of indirect excitons and their mediated spin transport in a MoSe2/WSe2 heterostructure under magnetic fields, revealing long-range transport phenomena with decay distances up to 100 micrometers.

Contribution

It demonstrates long-range indirect exciton and spin transport in a van der Waals heterostructure under magnetic fields, highlighting the magnetic field dependence of decay distances.

Findings

Long-range IX transport with decay distances up to 100 micrometers.

IX mediated spin transport shows similar long-range behavior.

Decay distances vary with IX density and magnetic field.

Abstract

We studied transport of indirect excitons (IXs) and IX mediated spin transport in a MoSe$_2$/WSe$_2$ van der Waals heterostructure in magnetic fields up to 8 T. We observed the long-range IX transport and the long-range IX mediated spin transport in the magnetic fields. The IX transport and spin transport are characterized by the 1/e decay distances reaching $\sim$ 100 micrometers. The decay distance of the spin transport correlates with the decay distance of IX transport. These decay distances first increase and then decrease with increasing IX density for all studied magnetic fields. The long-range IX transport and the long-range spin transport in the magnetic fields are consistent with the similar long-range transport in zero magnetic field.