Publication details

A Novel Ferroelectric Rashba Semiconductor

Authors

KRIZMAN Gauthier ZAKUSYLO Tetiana SAJEEV Lakshmi HAJLAOUI Mahdi TAKASHIRO Takuya ROSMUS Marcin OLSZOWSKA Natalia KOŁODZIEJ Jacek J. BAUER Günther CAHA Ondřej SPRINGHOLZ Gunther

Year of publication 2024
Type Article in Periodical
Magazine / Source Advanced Materials
MU Faculty or unit

Faculty of Science

Citation
Web https://onlinelibrary.wiley.com/doi/full/10.1002/adma.202310278
Doi http://dx.doi.org/10.1002/adma.202310278
Keywords angle-resolved photoemission spectroscopy; ferroelectricity; IV-VI compounds; phase transition; rashba spin texture; x-ray diffraction
Description Fast, reversible, and low-power manipulation of the spin texture is crucial for next generation spintronic devices like non-volatile bipolar memories, switchable spin current injectors or spin field effect transistors. Ferroelectric Rashba semiconductors (FERSC) are the ideal class of materials for the realization of such devices. Their ferroelectric character enables an electronic control of the Rashba-type spin texture by means of the reversible and switchable polarization. Yet, only very few materials are established to belong to this class of multifunctional materials. Here, Pb1-xGexTe is unraveled as a novel FERSC system down to nanoscale. The ferroelectric phase transition and concomitant lattice distortion are demonstrated by temperature dependent X-ray diffraction, and their effect on electronic properties are measured by angle-resolved photoemission spectroscopy. In few nanometer-thick epitaxial heterostructures, a large Rashba spin-splitting is exhibiting a wide tuning range as a function of temperature and Ge content. This work defines Pb1-xGexTe as a high-potential FERSC system for spintronic applications.

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