Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Electronic Compressibility of Magic-Angle Graphene Superlattices   We report the first electronic compressibility measurements of magic-angle
twisted bilayer graphene. The evolution of the compressibility with carrier
density offers insights into the interaction-driven ground state that have not
been accessible in prior transport and tunneling studies. From capacitance
measurements, we determine chemical potential as a function of carrier density
and find the widths of the energy gaps at fractional filling of the moir\'{e}
lattice. In the electron-doped regime, we observe unexpectedly large gaps at
quarter- and half-filling and strong electron-hole asymmetry. Moreover, we
measure a $\mathord{\sim}35\,\textrm{meV}$ mini-bandwidth that is much wider
than most theoretical estimates. Finally, we explore the field dependence up to
the quantum Hall regime and observe significant differences from transport
measurements.

12
The categories of this paper are: nucl-th
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The categories of this paper are: q-bio
7
The categories of this paper are: hep-th
26
The categories of this paper are: bayes-an
2
The categories of this paper are: math
24
The categories of this paper are: dg-ga
9
The categories of this paper are: nlin
35
The categories of this paper are: mtrl-th
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The categories of this paper are: nucl-ex
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The categories of this paper are: math-ph
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The categories of this paper are: adap-org
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The categories of this paper are: quant-ph
8
The categories of this paper are: hep-ex
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The categories of this paper are: solv-int
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The categories of this paper are: econ
28
The categories of this paper are: alg-geom