Giant Zeeman-type spin splitting of free electron/hole states on quasi-2D perovskite niobates: a theoretical prediction.

Abstract:

:We study the spin-orbit interaction of two-dimensional electron/hole gas (2DEGs/2DHGs) on quasi-2D potassium niobates (KNs) via first-principles calculations. The strong surface polarity changes the free surface states from 2DEGs to 2DHGs. The in-plane dipole maintained on 2D models leads to giant Zeeman-type spin splitting, as high as 566 meV for the (001)c facet KN and 1.21 eV for the (111)c facet KN. The thickness-dependent Zeeman-type spin splitting shows a linear relation with respect to 1/r, while the corresponding in-plane polarization quantum has a linear relation of 1/(2^0.5)with respect to a decrease in thickness. Interestingly, the 2DHGs with molecular-like orbital character is solely constituted by O 2p states, showing logic switchable behavior at extremely thin samples with enormous Zeeman-type splitting that can switch between insulator and conductor by opposite spin polarization.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Zhou Y,Zhou F,Liu Y,Lai Z,Liao M,Huang Y,Zhu J

doi

10.1038/s41598-020-60653-8

subject

Has Abstract

pub_date

2020-02-28 00:00:00

pages

3698

issue

1

issn

2045-2322

pii

10.1038/s41598-020-60653-8

journal_volume

10

pub_type

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