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Updated: Jun 28, 2025

Probe Type II Band Alignment in One-Dimensional Van Der Waals Heterostructures Using First-Principles Calculations

Probe Type II Band Alignment in One-Dimensional Van Der Waals Heterostructures Using First-Principles Calculations

Published on: October 12, 2019

Light-wave-controlled Haldane model in monolayer hexagonal boron nitride.

Sambit Mitra^1,2, Álvaro Jiménez-Galán^3,4, Mario Aulich^2,5

¹Max Planck Institute of Quantum Optics, Garching, Germany.

|April 15, 2024

Summary

This summary is machine-generated.

Researchers demonstrate optical control of electron transport in atom-thin materials. Tailored light waveforms mimic twisted layer stacking, enabling ultrafast switching of quantum properties and creating novel electronic devices.

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Area of Science:

Condensed Matter Physics
Quantum Optics
Materials Science

Background:

Atom-thin materials with matching crystal symmetry enable superlattice structures with emergent properties.
Control of light fields allows manipulation of electron transport on ultrafast timescales.

Purpose of the Study:

To demonstrate a light-wave-driven analogue to twisted layer stacking.
To achieve optical control over time-reversal symmetry breaking and realize the topological Haldane model in a laser-dressed 2D crystal.

Main Methods:

Tailoring the spatial symmetry of light waveforms to match hexagonal boron nitride lattice symmetry.
Twisting light waveforms to induce optical control of symmetry breaking.
Utilizing optical harmonic polarimetry to detect valley Hall currents.

Main Results:

Realization of the topological Haldane model in a laser-dressed 2D insulating crystal.
Ultrafast switching between band structure configurations by rotating the light waveform.
Generation of measurable valley Hall currents due to asymmetric population between quantum valleys.

Conclusions:

The developed scheme offers robust optical control over valley-selective bandgap engineering.
This approach enables the creation of few-femtosecond switches utilizing quantum degrees of freedom.
The findings open new avenues for ultrafast electronic devices and quantum information processing.