A direct dispersive signature of Pauli spin blockade

TL;DR

This paper demonstrates a direct, gate-dispersive reflectometry method to observe Pauli Spin Blockade in double quantum dots, revealing charge transition modulations and enabling fast, minimally invasive spin physics probing.

Contribution

It introduces a novel dispersive measurement technique for directly detecting Pauli Spin Blockade in quantum dot systems.

Findings

Reservoir charge transitions are modulated during PSB.

Effects are enhanced with larger bias voltage.

Magnetic field suppresses the observed effects.

Abstract

Pauli Spin Blockade (PSB) is a key paradigm in semiconductor nanostructures and gives access to the spin physics. We report the direct observation of PSB with gate-dispersive reflectometry on double quantum dots with source-drain bias. The reservoir charge transitions are strongly modulated, turning on and off when entering and leaving the blockaded region, consistent with a simple model. Seen with holes in Ge and Si, the effects are enhanced with larger bias voltage and suppressed by magnetic field. This work lays the foundation for fast probing of spin physics and minimally invasive spin readout.