Anisotropy in KTaO<sub>3</sub> (110)-based two-dimensional electron gases
ORAL
Abstract
The difference in superconducting critical temperature (Tc) between bidimensional electron gases (2DEGs) based on KTaO3 with different crystalline orientation continues to puzzle the community. Indeed, the record Tc for KTaO3 (111)- and KTaO3 (110)- 2DEGs are around 2.2 K and 1 K respectively, whereas KTaO3 (001) 2DEGs do not show superconductivity at interfaces. Meanwhile, SrTiO3 2DEGs do not exhibit such variability.
As the intermediate system, sharing one high symmetry direction with each other crystalline orientation, (110)-based systems could serve as a gateway for the understanding of the role of interface symmetry in the pairing mechanism. Here, we present ARPES- and transport-based characterisation of KTaO3 (110) 2DEGs. We observe the elliptical and anisotropic Fermi surface and detail the spin texture. Field-effect magnetotransport experiments with microdevices further reveal anisotropy, with non-reciprocal response, and in the superconducting transition.
As the intermediate system, sharing one high symmetry direction with each other crystalline orientation, (110)-based systems could serve as a gateway for the understanding of the role of interface symmetry in the pairing mechanism. Here, we present ARPES- and transport-based characterisation of KTaO3 (110) 2DEGs. We observe the elliptical and anisotropic Fermi surface and detail the spin texture. Field-effect magnetotransport experiments with microdevices further reveal anisotropy, with non-reciprocal response, and in the superconducting transition.
–
Presenters
-
Hugo Witt
- Unité Mixte de Physique, CNRS, Thales, Université Paris-Saclay, Palaiseau
- Unité Mixte de Physique CNRS-Thales