# Spin-polarized two-dimensional electron/hole gases on LiCoO$_2$ layers.

### Submission summary

 As Contributors: Santosh Kumar Radha Preprint link: scipost_202011_00010v1 Date submitted: 2020-11-11 14:27 Submitted by: Radha, Santosh Kumar Submitted to: SciPost Physics Academic field: Physics Specialties: Condensed Matter Physics - Theory Condensed Matter Physics - Computational Approaches: Theoretical, Computational

### Abstract

First-principles calculations show the formation of a 2D spin polarized electron (hole) gas on the Li (CoO$_2$) terminated surfaces of finite slabs down to a monolayer, in remarkable contrast with the bulk band structure, which is stabilized by Li donating its electron to the CoO$_2$ layer forming a Co-$d-t_{2g}^6$ insulator. By mapping the first-principles computational results to a minimal tight-binding models corresponding to a non-chiral 3D generalization of the quadripartite Su-Schrieffer-Heeger (SSH4) model and symmetry analysis, we show that these surface states have topological origin.

###### Current status:
Editor-in-charge assigned