Observation of a dynamic magneto-chiral instability in photoexcited tellurium
arXiv:2502.05170 · doi:10.1038/s41567-025-03145-8
Abstract
In a system of charged chiral fermions driven out of equilibrium, an electric current parallel to the magnetic field can generate a dynamic instability by which electromagnetic waves become amplified. Whether a similar instability can occur in chiral solid-state systems remains an open question. Using time-domain terahertz (THz) emission spectroscopy, we detect signatures of what we dub a ``dynamic magneto-chiral instability" in elemental tellurium, a structurally chiral crystal. Upon transient photoexcitation in a moderate external magnetic field, tellurium emits THz radiation consisting of coherent modes that amplify over time. An explanation for this amplification is proposed using a theoretical model based on a dynamic instability of electromagnetic waves interacting with infrared-active oscillators of impurity acceptor states in tellurium to form an amplifying polariton. Our work not only uncovers the presence of a magneto-chiral instability but also highlights its promise for THz-wave amplification in chiral materials.
arXiv commentSupplementary Information (SI) available as a PDF in the TeX source
References in corpus (26)
- The Chiral Magnetic Effect
- Observation of the chiral magnetic effect in ZrTe5
- Dynamical Axion Field in Topological Magnetic Insulators
- Topological quantum properties of chiral crystals
- Weyl Node and Spin Texture in Trigonal Tellurium and Selenium
- Gyrotropic magnetic effect and the magnetic moment on the Fermi surface
- Self-consistent evolution of magnetic fields and chiral asymmetry in the early Universe
- Chiral Plasma Instabilities
- Axion response in Weyl semimetals
- Gate-tuneable and chirality-dependent charge-to-spin conversion in Tellurium nanowires
- Chiral magnetic effect and natural optical activity in (Weyl) metals
- Chiral transport of neutrinos in supernovae: Neutrino-induced fluid helicity and helical plasma instability
- Self-similar inverse cascade of magnetic helicity driven by the chiral anomaly
- Ultrafast Photoinduced Band Splitting and Carrier Dynamics in Chiral Tellurium Nanosheets
- Magnetoelectric Effects in Gyrotropic Superconductors
- Signatures of the chiral anomaly in phonon dynamics
- Instability in magnetic materials with dynamical axion field
- Chiral Langevin theory for non-Abelian plasmas
- Quantification of chirality based on electric toroidal monopole
- Odd non-linear conductivity under spatial inversion in chiral Tellurium
- Impact of a mean field dynamo on neutron star mergers leading to magnetar remnants
- Emergence of chirality by multipole interconversion
- Ultrafast relaxation of symmetry-breaking photo-induced atomic forces
- Chiral light amplifier with pumped Weyl semimetals
- Dynamical chiral magnetic current and instability in Weyl semimetals
- Anomalous plasma: chiral magnetic effect and all that