Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Effect of ferromagnetic exchange field on band-gap and spin-polarization
  of graphene on a TMD substrate   We calculate the electronic band dispersion of graphene monolayer on a two
dimensional transition metal dichalcogenide substrate (GTMD) (viz., XY2 , X =
Mo, W; Y = S, Se) around K and K prime points taking into account the interplay
of the exchange field due to the ferromagnetic impurities and the substrate
induced, sub-lattice-resolved, strongly enhanced intrinsic spin-orbit
couplings(SOC). There are extrinsic Rashba spin-orbit coupling(RSOC) and the
orbital gap related to the transfer of the electronic charge from graphene to
XY2 as well. The former allows for external tuning of the band gap in GTMD and
connects the nearest neighbors with spin-flip. On account of the strong SOC,
the system acts as a quantum spin Hall insulator. We introduce the exchange
field (M) in the Hamiltonian to take into account the deposition of Fe atoms on
the graphene surface. The cavalcade of the perturbations yield particle-hole
symmetric bands with an effective Zeeman field due to the interplay of the
substrate induced interactions with RSOC as the prime player. Our graphical
analysis with extremely low-lying states strongly suggests the following: The
GTMDs like WY2 exhibit band gap narrowing/widening (Moss-Burs-tein(MB)gap
shift)including the spin-polarization inversion(SPI) at finite but low
temperature (T = 1 K) due to the increase in the exchange field (M) at the
Dirac point K. For graphene on MoY2, on the other hand, the occurrence of the
MB-shift and the SPI at higher temperature (T = 10 K) take place as M is
increased at the Dirac point K prime. Finally, there is anti-crossing of
non-parabolic bands with opposite spins around Dirac points. A direct electric
field control of magnetism at the nano-scale is needed here. The magnetic
multi-ferroics, like BiFeO3 (BFO), are useful for this purpose due to the
coupling between the magnetic and electric order parameters.

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The categories of this paper are: econ
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The categories of this paper are: q-fin
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The categories of this paper are: nucl-ex
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The categories of this paper are: funct-an
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The categories of this paper are: dg-ga
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The categories of this paper are: gr-qc
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The categories of this paper are: nucl-th
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The categories of this paper are: mtrl-th
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The categories of this paper are: chem-ph
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The categories of this paper are: cmp-lg
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The categories of this paper are: atom-ph
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The categories of this paper are: hep-th
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The categories of this paper are: ao-sci
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The categories of this paper are: cs
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The categories of this paper are: stat
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The categories of this paper are: solv-int