71,004 research outputs found
The Wess-Zumino term and quantum tunneling
The significance of the Wess--Zumino term in spin tunneling is explored, and
a formula is established for the splitting of energy levels of a particle with
large fermionic spin as an applied magnetic field is switched on.Comment: Latex, 7 page
Superconducting proximity effect and Majorana fermions at the surface of a topological insulator
We study the proximity effect between an s-wave superconductor and the
surface states of a strong topological insulator. The resulting two dimensional
state resembles a spinless p_x+ip_y superconductor, but does not break time
reversal symmetry. This state supports Majorana bound states at vortices. We
show that linear junctions between superconductors mediated by the topological
insulator form a non chiral 1 dimensional wire for Majorana fermions, and that
circuits formed from these junctions provide a method for creating,
manipulating and fusing Majorana bound states.Comment: 4 pages, 3 figures, published versio
Post-Baccalaureate Wage Growth within Four Years of Graduation: The Effects of College Quality and College Major
This paper examines the impact of college quality and academic major on the earnings of a nationally representative sample of baccalaureate recipients. We extend previous work in this area by analyzing the magnitude of change in the influence of these factors at two points in the early career of these graduates. Our results demonstrate that, despite significant variation, graduates from higher quality colleges enjoy a greater rate of growth in earnings during their early career. We also show that growth in earnings varies significantly by the graduates’ major field of study. Wage growth for women and racial minorities is also examined
Visualization of Dimensional Effects in Collective Excitations of Optically Trapped Quasi-Two-Dimensional Bose Gases
We analyze the macroscopic dynamics of a Bose gas axially confined in an
optical lattice with a superimposed harmonic trap, taking into account weak
tunneling effect. Our results show that upon transition to the
quasi-two-dimensional (2D) regime of the trapped gas, the 3D equation of state
and equilibrium density profile acquire corrections from 2D many-body effects.
The corresponding frequency shift in the transverse breathing mode is
accessible within current facilities, suggesting a direct observation of
dimensional effects. Comparisons with other relevant effects are also
presented.Comment: 4 pages, 1 figur
A method for accurate electron-atom resonances: The complex-scaled multiconfigurational spin-tensor electron propagator method for the ^2P\, \mbox{Be}^{-} shape resonance problem
We propose and develop the complex scaled multiconfigurational spin-tensor
electron propagator (CMCSTEP) technique for theoretical determination of
resonance parameters with electron-atom/molecule systems including open-shell
and highly correlated atoms and molecules. The multiconfigurational spin-tensor
electron propagator method (MCSTEP) developed and implemented by Yeager his
coworkers in real space gives very accurate and reliable ionization potentials
and attachment energies. The CMCSTEP method uses a complex scaled
multiconfigurational self-consistent field (CMCSCF) state as an initial state
along with a dilated Hamiltonian where all of the electronic coordinates are
scaled by a complex factor. CMCSCF was developed and applied successfully to
resonance problems earlier. We apply the CMCSTEP method to get ^2
P\,\mbox{Be}^{-} shape resonance parameters using , , and
basis sets with a \,CAS. The obtained value of the resonance
parameters are compared to previous results. This is the first time CMCSTEP has
been developed and used for a resonance problem. It will be among the most
accurate and reliable techniques. Vertical ionization potentials and attachment
energies in real space are typically within or better of
excellent experiments and full configuration interaction calculations with a
good basis set. We expect the same sort of agreement in complex space.Comment: 13 pages, 3 figue
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