6,227 research outputs found
Quantum states in a magnetic anti-dot
We study a new system in which electrons in two dimensions are confined by a
non homogeneous magnetic field. The system consists of a heterostructure with
on top of it a superconducting disk. We show that in this system electrons can
be confined into a dot region. This magnetic anti-dot has the interesting
property that the filling of the dot is a discrete function of the magnetic
field. The circulating electron current inside and outside the anti-dot can be
in opposite direction for certain bound states. And those states exhibit a
diamagnetic to paramagnetic transition with increasing magnetic field. The
absorption spectrum consists of many peaks, some of which violate Kohn's
theorem, and which is due to the coupling of the center of mass motion with the
other degrees of freedom.Comment: 6 pages, 12 ps figure
Multiband tunneling in trilayer graphene
The electronic tunneling properties of the two stable forms of trilayer
graphene (TLG), rhombohedral ABC and Bernal ABA, are examined for pn and pnp
junctions as realized by using a single gate (SG) or a double gate (DG). For
the rhombohedral form, due to the chirality of the electrons, the Klein paradox
is found at normal incidence for SG devices while at high energy interband
scattering between additional propagation modes can occur. The electrons in
Bernal ABA TLG can have a monolayer- or bilayer-like character when incident on
a SG device. Using a DG however both propagation modes will couple by breaking
the mirror symmetry of the system which induces intermode scattering and
resonances that depend on the width of the DG pnp junction. For ABC TLG the DG
opens up a band gap which suppresses Klein tunneling. The DG induces also an
unexpected asymmetry in the tunneling angle for single valley electrons
Electron spin and charge switching in a coupled quantum dot quantum ring system
Few-electron systems confined in a quantum dot laterally coupled to a
surrounding quantum ring in the presence of an external magnetic field are
studied by exact diagonalization. The distribution of electrons between the dot
and the ring is influenced by the relative strength of the dot and ring
confinement, the gate voltage and the magnetic field which induces transitions
of electrons between the two parts of the system. These transitions are
accompanied by changes in the periodicity of the Aharonov-Bohm oscillations of
the ground-state angular momentum. The singlet-triplet splitting for a two
electron system with one electron confined in the dot and the other in the ring
exhibits piecewise linear dependence on the external field due to the
Aharonov-Bohm effect for the ring-confined electron, in contrast to smooth
oscillatory dependence of the exchange energy for laterally coupled dots in the
side-by-side geometry.Comment: to appear in PRB in August 200
Phonon Softening and Direct to Indirect Bandgap Crossover in Strained Single Layer MoSe2
Motivated by recent experimental observations of Tongay et al. [Tongay et
al., Nano Letters, 12(11), 5576 (2012)] we show how the electronic properties
and Raman characteristics of single layer MoSe2 are affected by elastic biaxial
strain. We found that with increasing strain: (1) the E' and E" Raman peaks
(E1g and E2g in bulk) exhibit significant red shifts (up to 30 cm-1), (2) the
position of the A1' peak remains at 180 cm-1 (A1g in bulk) and does not change
considerably with further strain, (3) the dispersion of low energy flexural
phonons crosses over from quadratic to linear and (4) the electronic band
structure undergoes a direct to indirect bandgap crossover under 3% biaxial
tensile strain. Thus the application of strain appears to be a promising
approach for a rapid and reversible tuning of the electronic, vibrational and
optical properties of single layer MoSe2 and similar MX2 dichalcogenides.Comment: http://link.aps.org/doi/10.1103/PhysRevB.87.12541
Adsorption of H2O, NH3, CO, NO2, and NO on graphene: A first-principles study
Motivated by the recent realization of graphene sensors to detect individual
gas molecules, we investigate the adsorption of H2O, NH3, CO, NO2, and NO on a
graphene substrate using first-principles calculations. The optimal adsorption
position and orientation of these molecules on the graphene surface is
determined and the adsorption energies are calculated. Molecular doping, i.e.
charge transfer between the molecules and the graphene surface, is discussed in
light of the density of states and the molecular orbitals of the adsorbates.
The efficiency of doping of the different molecules is determined and the
influence of their magnetic moment is discussed.Comment: 6 pages, 6 figure
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