Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Scaling law for the Rashba-type spin splitting in quantum well films   We use laser-based spin- and angle-resolved photoemission spectroscopy
(laser-SARPES) with high-resolution, and experimentally determine, for the
first time, the Rashba-parameters of quantum well states (QWSs) systematically
changing with the film thickness and the quantum numbers, through the
observation of the Ag films grown on an Au(111) substrate. The data are very
well reproduced by the theoretical calculations based on the density functional
theory. Most importantly, we find a scaling law for the Rashba parameter
($\alpha_{\rm R}$) that the magnitude of $\alpha_{\rm R}$ is scaled by the
charge density at the interface and the spin-orbit coupling ratio between the
film and the substrate, and it is expressed by a single straight line
regardless of the film thickness and the quantum numbers. The new finding not
only is crucial to understand the Rashba effect in QWSs but also gives a
foundation of film growth engineering to fine-tune the spin splitting in 2D
heterostructure systems.

3
The categories of this paper are: physics
27
The categories of this paper are: comp-gas
34
The categories of this paper are: chem-ph
35
The categories of this paper are: mtrl-th
17
The categories of this paper are: q-fin
7
The categories of this paper are: hep-th
28
The categories of this paper are: alg-geom
14
The categories of this paper are: math-ph
23
The categories of this paper are: solv-int
1
The categories of this paper are: cs
11
The categories of this paper are: hep-lat
18
The categories of this paper are: econ
5
The categories of this paper are: gr-qc
0
The categories of this paper are: hep-ph
37
The categories of this paper are: supr-con
12
The categories of this paper are: nucl-th