1,884 research outputs found
Mass Defect Effects in Atomic Clocks
We consider some implications of the mass defect on the frequency of atomic
transitions. We have found that some well-known frequency shifts (gravitational
shift and motion-induced shifts such as: quadratic Doppler and micromotion
shifts) can be interpreted as consequences of the mass defect in quantum atomic
physics, i.e., without the need for the concept of time dilation used in
special and general relativity theories. Moreover, we show that the inclusion
of the mass defect leads to previously unknown shifts for clocks based on
trapped ions.Comment: 8 pages, 1 figur
Impact of high-frequency pumping on anomalous finite-size effects in three-dimensional topological insulators
Lowering of the thickness of a thin-film three-dimensional topological
insulator down to a few nanometers results in the gap opening in the spectrum
of topologically protected two-dimensional surface states. This phenomenon,
which is referred to as the anomalous finite-size effect, originates from
hybridization between the states propagating along the opposite boundaries. In
this work, we consider a bismuth-based topological insulator and show how the
coupling to an intense high-frequency linearly polarized pumping can further be
used to manipulate the value of a gap. We address this effect within recently
proposed Brillouin-Wigner perturbation theory that allows us to map a
time-dependent problem into a stationary one. Our analysis reveals that both
the gap and the components of the group velocity of the surface states can be
tuned in a controllable fashion by adjusting the intensity of the driving field
within an experimentally accessible range and demonstrate the effect of
light-induced band inversion in the spectrum of the surface states for high
enough values of the pump.Comment: 6 pages, 3 figure
- …