THz laser pulses can excite phonons in tellurium that shift the lattice enough to flip the sign of the nonlinear Hall effect in electron-doped samples.
Light-induced renormalization of the band structure of chiral tellurium
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abstract
Chirality in tellurium derives from a Peierls distortion driven by strong electron-phonon coupling, making this material a unique candidate for observing a light-induced topological phase transition. By using time- and angle-resolved photoelectron spectroscopy (trARPES), we reveal that upon near-infrared photoexcitation the Peierls gap is modulated by displacively excited coherent phonons with $\mathrm{A_{1g}}$ symmetry as well as chiral-symmetry-breaking $\mathrm{E'_{LO}}$ modes. By comparison with state-of-the-art TDDFT+U calculations, we reveal the microscopic origin of the in-phase oscillations of band edges, due to phonon-induced modulation of the effective Hubbard $U$ term.
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cond-mat.mtrl-sci 1years
2024 1verdicts
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Laser-Controlled Nonlinear Hall Effect in Tellurium Solids via Nonlinear Phononics
THz laser pulses can excite phonons in tellurium that shift the lattice enough to flip the sign of the nonlinear Hall effect in electron-doped samples.