Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Charge transfer driven emergent phenomena in oxide heterostructures   Complex oxides exhibit many intriguing phenomena, including metal-insulator
transition, ferroelectricity/multiferroicity, colossal magnetoresistance and
high transition temperature superconductivity. Advances in epitaxial thin film
growth techniques enable us to combine different complex oxides with atomic
precision and form an oxide heterostructure. Recent theoretical and
experimental work has shown that charge transfer across oxide interfaces
generally occurs and leads to a great diversity of emergent interfacial
properties which are not exhibited by bulk constituents. In this report, we
review mechanisms and physical consequence of charge transfer across interfaces
in oxide heterostructures. Both theoretical proposals and experimental
measurements of various oxide heterostructures are discussed and compared. We
also review the theoretical methods that are used to calculate charge transfer
across oxide interfaces and discuss the success and challenges in theory.
Finally, we present a summary and perspectives for future research.

30
The categories of this paper are: q-alg
19
The categories of this paper are: eess
8
The categories of this paper are: hep-ex
36
The categories of this paper are: cmp-lg
13
The categories of this paper are: quant-ph
6
The categories of this paper are: astro-ph
9
The categories of this paper are: nlin
23
The categories of this paper are: solv-int
17
The categories of this paper are: q-fin
20
The categories of this paper are: acc-phys
33
The categories of this paper are: plasm-ph
7
The categories of this paper are: hep-th
31
The categories of this paper are: ao-sci
14
The categories of this paper are: math-ph
12
The categories of this paper are: nucl-th
11
The categories of this paper are: hep-lat