25 research outputs found
Zitterbewegung of a heavy hole in presence of spin-orbit interactions
We study the of a heavy hole in presence of both cubic
Rashba and cubic Dresselhaus spin-orbit interactions. On contrary to the
electronic case, does not vanish for equal strength of Rashba
and Dresselhaus spin-orbit interaction. This non-vanishing of
is associated with the Berry phase. Due to the presence of the spin-orbit
coupling the spin associated with the heavy hole precesses about an effective
magnetic field. This spin precession produces a transverse spin-orbit force
which also generates an electric voltage associated with . We
have estimated the magnitude of this voltage for a possible experimental
detection of .Comment: 6 pages, 3 figure
Wave packet dynamics in monolayer MoS with and without a magnetic field
We study the dynamics of electrons in monolayer Molybdenum Disulfide
(MoS), in the absence as well as presence of a transverse magnetic field.
Considering the initial electronic wave function to be a Gaussian wave packet,
we calculate the time dependent expectation value of position and velocity
operators. In the absence of the magnetic field, the time dependent average
values of position and velocity show damped oscillations dependent on the width
of the wave packet. In the presence of a transverse magnetic field, the wave
packet amplitude shows oscillatory behaviour over short timescales associated
with classical cyclotron orbit, followed by the phenomena of spontaneous
collapse and revival over larger timescales. We relate the timescales of these
effects and our results can be useful for the interpretation of experiments
with trapped ions.Comment: 8pages, 3 figures. typos corrected and improved presentatio