Related Experiment Video
Updated: Jul 5, 2026

Excitonic Hamiltonians for Calculating Optical Absorption Spectra and Optoelectronic Properties of Molecular Aggregates and Solids
Published on: May 27, 2020
Excitons in van der Waals magnetic materials
Pratap Chandra Adak1, Florian Dirnberger2,3,4, Swagata Acharya5
1Department of Physics, City College of New York, New York, NY, USA. padak@ccny.cuny.edu.
Abstract:
Two-dimensional magnetic semiconductors provide a unique platform where long-range magnetic order coexists with strongly bound excitons. Because excitonic states and magnetic moments originate from the same electronic orbitals and couple via intrinsic exchange interactions, optical excitations in these systems exhibit pronounced sensitivity to magnetic order. Recent experiments show unusually strong magneto-optical responses and direct exciton-magnon coupling, establishing new routes for controlling light-matter interactions with spin degrees of freedom. This Review surveys key developments, focusing on representative material systems, experimental signatures, and theoretical frameworks used to describe these phenomena. We conclude with perspectives on how this rapidly evolving field could enable next-generation optoelectronic and quantum technologies leveraging the coupled dynamics of light, charge and spin.
Related Concept Videos
Atomic Nuclei: Nuclear Relaxation Processes
Valence Bond Theory
Diamagnetism
Diamagnetism was discovered by Anton Brugmans in 1778 when he observed that bismuth gets repelled by magnetic fields, thus theorizing that diamagnets get repelled by magnets.
Magnetic Vector Potential
Consider an ideal solenoid with n turns per unit length and radius R. If I is the current through the solenoid, the magnetic field inside the solenoid is expressed as the product of vacuum...
Potential Due to a Magnetized Object
The vector...
Van der Waals Interactions

