Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Transport Measurement of Landau level Gaps in Bilayer Graphene   Landau level gaps are important parameters for understanding electronic
interactions and symmetry-broken processes in bilayer graphene (BLG). Here we
present transport spectroscopy measurements of LL gaps in double-gated
suspended BLG with high mobilities in the quantum Hall regime. By using bias as
a spectroscopic tool, we measure the gap {\Delta} for the quantum Hall (QH)
state at filling factor {\nu}={\pm}4 and -2. The single-particle gap for
{\nu}=4 scales linearly with magnetic field B and is independent of the
out-of-plane electric field E. For the symmetry-broken {\nu}=-2 state, the
measured values of gap are 1.1 meV/T and 0.17 meV/T for singly-gated geometry
and dual-gated geometry at E=0, respectively. The difference between the two
values arises from the E-dependence of the gap, suggesting that the {\nu}=-2
state is layer polarized. Our studies provide the first measurements of the
gaps of the broken symmetry QH states in BLG with well-controlled E, and
establish a robust method that can be implemented for studying similar states
in other layered materials.

28
The categories of this paper are: alg-geom
6
The categories of this paper are: astro-ph
19
The categories of this paper are: eess
3
The categories of this paper are: physics
31
The categories of this paper are: ao-sci
35
The categories of this paper are: mtrl-th
13
The categories of this paper are: quant-ph
14
The categories of this paper are: math-ph
36
The categories of this paper are: cmp-lg
17
The categories of this paper are: q-fin
37
The categories of this paper are: supr-con
1
The categories of this paper are: cs
30
The categories of this paper are: q-alg
23
The categories of this paper are: solv-int
25
The categories of this paper are: patt-sol
15
The categories of this paper are: nucl-ex