Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Momentum microscopy of Pb-intercalated graphene on SiC: charge
  neutrality and electronic structure of interfacial Pb   Intercalation is an established technique for tailoring the electronic
structure of epitaxial graphene. Moreover, it enables the synthesis of
otherwise unstable two-dimensional (2D) layers of elements with unique physical
properties compared to their bulk versions due to interfacial quantum
confinement. In this work, we present uniformly Pb-intercalated
quasi-freestanding monolayer graphene on SiC, which turns out to be essentially
charge neutral with an unprecedented $p$-type carrier density of only
$(5.5\pm2.5)\times10^9$ cm$^{-2}$. Probing the low-energy electronic structure
throughout the entire first surface Brillouin zone by means of momentum
microscopy, we clearly discern additional bands related to metallic 2D-Pb at
the interface. Low-energy electron diffraction further reveals a $10\times10$
Moir\'e superperiodicity relative to graphene, counterparts of which cannot be
directly identified in the available band structure data. Our experiments
demonstrate 2D interlayer confinement and associated band structure formation
of a heavy-element superconductor, paving the way towards strong spin-orbit
coupling effects or even 2D superconductivity at the graphene/SiC interface.

22
The categories of this paper are: chao-dyn
35
The categories of this paper are: mtrl-th
17
The categories of this paper are: q-fin
3
The categories of this paper are: physics
36
The categories of this paper are: cmp-lg
29
The categories of this paper are: funct-an
19
The categories of this paper are: eess
23
The categories of this paper are: solv-int
11
The categories of this paper are: hep-lat
7
The categories of this paper are: hep-th
37
The categories of this paper are: supr-con
13
The categories of this paper are: quant-ph
9
The categories of this paper are: nlin
10
The categories of this paper are: q-bio
1
The categories of this paper are: cs
16
The categories of this paper are: stat