Events

Pierre Monceau, MagSup team, will present
the monthly NÉEL seminar

Tuesday, February 21, 2023 at 9:30 am

Salle des séminaires – Bâtiment A

Title: Charge density waves… My love

Abstract :

It is exactly fifty years since charge density waves (CDWs) – a modulation of electronic charges concomitant with a distortion of the crystal lattice – were experimentally demonstrated in one- and two-dimensional compounds. The properties of these CDWs have been intensively studied at the CRTBT, at the LEPES and pursued at Institut Néel. Rather than a similar approach to that of “Le Temps Retrouvé”, the seminar will concern some recent results involving the nonlinear properties of CDWs. The first part¹ shows the use of the Hall voltage to depin the CDW of NbSe3 in nano-structures of submicron size. Measurement of the pinning force is also used² to characterize the non-equilibrium nature of the CDW ground state in rare earth tellurides (RTe₃). Finally, do magneto-conductivity measurements in the non-linear CDW state of (TaSe₄)₂I, recently described as a Weyl semi-metal, reveal an axionic type character³?.

1-A.V. Frolov et al. Applied Phys. Letters, 118, 213102 (2021)
2-A.V. Frolov, et al. Applied Phys. Letters, 118, 253102 (2021)
3-A.A. Sinchenko et al., Applied Phys. Letters, 120, 063102 (2022))