20,698 research outputs found
Tunable Quantum Hall Edge Conduction in Bilayer Graphene through Spin-Orbit Interaction
Bilayer graphene, in the presence of a one-sided spin-orbit interaction (SOI)
induced by a suitably chosen substrate, is predicted to exhibit unconventional
Quantum Hall states. The new states arise due to strong SOI-induced splittings
of the eight zeroth Landau levels, which are strongly layer-polarized, residing
fully or partially on one of the two graphene layers. In particular, an Ising
SOI in the meV scale is sufficient to invert the Landau level order between the
and orbital levels under moderately weak magnetic fields \~T. Furthermore, when the Ising field opposes the field, the
order of the spin-polarized levels can also be inverted. We show that, under
these conditions, three different compensated electron-hole phases, with equal
concentrations of electrons and holes, can occur at filling. The
three phases have distinct edge conductivity values. One of the phases is
especially interesting, since its edge conduction can be turned on and off by
switching the sign of the interlayer bias.Comment: 10 pages, 5 figure
as a virtual state from interaction
In this work, we study the and invariant mass
spectra of the decay to find out the origin of the and
structures. The interaction is studied in
a coupled-channel quasipotential Bethe-Saltpeter equation approach, and
embedded to the decay process to reproduce both and
invariant mass spectra observed at BESIII simultaneously. It is
found out that a virtual state at energy about 3870 MeV is produced from the
interaction when both invariant mass spectra are comparable with the
experiment. The results support that both and have the
same origin, that is, a virtual state from
interaction, in which the interaction is more important and the
coupling between and channels plays a minor role.Comment: 8 pages, 4 figures, more reference adde
Interface dynamics under nonequilibrium conditions: from a self-propelled droplet to dynamic pattern evolution
In this article, we describe the instability of a contact line under
nonequilibrium conditions mainly based on the results of our recent studies.
Two experimental examples are presented: the self-propelled motion of a liquid
droplet and spontaneous dynamic pattern formation. For the self-propelled
motion of a droplet, we introduce an experiment in which a droplet of aniline
sitting on an aqueous layer moves spontaneously at an air-water interface. The
spontaneous symmetry breaking of Marangoni-driven spreading causes regular
motion. In a circular Petri dish, the droplet exhibits either beeline motion or
circular motion. On the other hand, we show the emergence of a dynamic
labyrinthine pattern caused by dewetting of a metastable thin film from the
air-water interface. The contact line between the organic phase and aqueous
phase forms a unique spatio-temporal pattern characterized as a dynamic
labyrinthine. Motion of the contact line is controlled by diffusion processes.
We propose a theoretical model to interpret essential aspects of the observed
dynamic behavior
- β¦