- Jisoon
- Suk Bum
bibliography:
- 'rashbaoxide.bib'
date:
- 
- 
title: 'Strongly enhanced Rashba splittings in oxide heterostructure: a tantalate monolayer on BaHfO$_3$'
---

Recently, the spin-orbit interaction of the two-dimensional electron gas (2DEG) at the surfaces and interfaces of the perovskite transition metal (TM) oxide  [-@Ohtomo2004; -@Takagi2010; -@Mannhart2010; -@Santander2011; -@Meevasana2011] has been much investigated experimentally [-@BenShalom2010; -@Caviglia2010; -@Santander2014; -@Santander2012; -@King2012; -@Reyren2012; -@MKim2012]. However, definite understanding on how its magnitude might be maximized has not been well established. It is the combination of the broken inversion symmetry and the atomic spin-orbit coupling (SOC) of the TM that gives rise to a non-zero spin splitting in the form of the Rashba spin-orbit interaction [-@Bychkov1984; -@Dresselhaus1955; -@Winkler2003]. But this origin implies that the magnitude of the spin-orbit interaction is intrinsically limited by the TM atomic SOC. The limitation should be apparent in the best-studied perovskite 2DEGs — the SrTiO$_3$ (STO) surface and the LaAlO$_3$/SrTiO$_3$ (LAO/STO) heterostructure interface — as the atomic SOC strength of the 3$d$ TM Ti is relatively small [-@Zhong2013; -@Khalsa2013; -@PKim2014]. Experimental evidences have been mixed, with the claims of large magnitude stemming from the magnetoresistance measurements  [-@BenShalom2010; -@Caviglia2010; -@Santander2012; -@King2012; -@Santander2014] contradicted by the Hanle effect measurement 