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Related Experiment Video

Updated: Jan 7, 2026

Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform

Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform

Published on: August 2, 2019

A chiral fermionic valve driven by quantum geometry.

Anvesh Dixit¹, Pranava K Sivakumar¹, Kaustuv Manna^2,3

¹Max Planck Institute of Microstructure Physics, Halle (Saale), Germany.

|December 31, 2025

Summary

This summary is machine-generated.

Researchers developed a chiral fermionic valve using quantum geometry to separate particles by chirality without magnetic fields. This breakthrough enables controllable quantum interference and current-induced magnetization.

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Area of Science:

Condensed Matter Physics
Quantum Materials
Topological Matter

Background:

Topological semimetals feature fermions with opposite chiralities.
Chiral transport typically requires magnetic fields or dopants to separate chiral states.
Existing methods struggle to isolate and control chiral fermions effectively.

Purpose of the Study:

To utilize quantum geometry for filtering fermions by chirality.
To demonstrate real-space separation of opposite chiral currents without magnetic fields.
To establish a chiral fermionic valve with novel functionalities.

Main Methods:

Fabrication of devices from single-crystal PdGa in a three-arm geometry.
Exploitation of quantum geometry to induce anomalous velocities in chiral fermions.
Observation of quantum interference of spatially separated chiral currents.

Main Results:

Demonstrated real-space separation of currents with opposite fermionic chiralities.
Observed quantum interference of these currents in the absence of magnetic fields.
Exhibited a nonlinear Hall effect due to quantum-geometry-induced anomalous velocities.

Conclusions:

The developed chiral fermionic valve spatially separates fermions by Chern number using quantum geometry.
The device enables tunable current-induced magnetization.
It provides a platform for controllable quantum interference of chiral quasiparticles.