Imaging orbital Rashba induced charge transport anisotropy

• DOI: 10.48550/arxiv.2502.09719
• Publication Date: 2025-02-13
• Authors: Eylon Persky; Xi Wang; Giacomo Sala; Thierry C. van Thiel; Edouard Lesne; Alexander Lau; Mario Cuoco; M. Gabay; Carmine Ortix; Andrea D. Caviglia; Beena Kalisky
• Keywords: Condensed Matter - Materials Science; Condensed Matter - Strongly Correlated Electrons; Condensed Matter - Mesoscale and Nanoscale Physics; Strongly Correlated Electrons (cond-mat.str-el); Mesoscale and Nanoscale Physics (cond-mat.mes-hall); Materials Science (cond-mat.mtrl-sci); FOS: Physical sciences

Identifying orbital textures and their effects on the electronic properties of quantum materials is a critical element in developing orbitronic devices. However, are often entangled with spin degree freedom, making it difficult to uniquely identify them charge transport phenomena. Here, we present combination scanning superconducting interference device (SQUID) current imaging, global measurements, theoretical analysis, that reveals direct contribution linear 2D systems. Specifically, show LaAlO$_3$/SrTiO$_3$ interface, which lacks both rotation inversion symmetries, an anisotropic Rashba coupling leads conductivity anisotropy zero magnetic field. We experimentally demonstrate this result by locally measuring anisotropy, correlating its appearance non-linear Hall effect, showing two phenomena have common origin. Our results lay foundations for all--electrical probing currents two-dimensional