Terahertz-Speed Manipulation of Two-Dimensional Ferroelectricity
Abstract
Two-dimensional (2D) van der Waals ferroelectrics have recently emerged as highly promising candidates for next-generation nanoelectronic, spintronic, and sensing devices. Unlike their bulk counterparts, these solids exhibit defect-free, CMOS-compatible interfaces and can be integrated into 2D heterostructures to allow novel functionalities. Future progress in van der Waals ferroelectric technologies hinges on the ability to manipulate the electric polarization at the fastest possible timescales and with low heat dissipation. In theory, this requires an external stimulus to trigger all-coherent dynamics of the polarization, collectively steering the relevant microscopic degrees of freedom across the potential barrier that separates distinct domain states. For most ferroelectrics, this entails the coherent excitation of specific collective modes that have the same symmetry of the ferroelectric order parameter and lie in the terahertz (THz) frequency range. However, the integration of THz driving protocols with probes of 2D collective properties has so far been hindered by several technical constraints, such as the achievable THz field selectivity and probing sensitivity. In this research program, we will combine a suite of advanced techniques - including multidimensional THz polarimetry and ultrafast second harmonic generation microscopy - to acquire fundamental understanding and full dynamic control over the collective modes of 2D ferroelectrics. This multi-messenger approach will provide an entirely new view on these systems and enable us to investigate emergent families of 2D materials in which ferroelectricity coexists with other macroscopic functionalities, most notably metallicity, superconductivity, and magnetism.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Feb 06, 2025
- Source ID
- FA95502410097
Entities
People
- Edoardo Baldini
Organizations
- Air Force Office of Scientific Research
- United States Air Force
- University of Texas at Austin