669 research outputs found
Discrete symmetries in the three-Higgs-doublet model
N-Higgs-doublet models (NHDM) are among the most popular examples of
electroweak symmetry breaking mechanisms beyond the Standard Model. Discrete
symmetries imposed on the NHDM scalar potential play a pivotal role in shaping
the phenomenology of the model, and various symmetry groups have been studied
so far. However, in spite of all efforts, the classification of finite
Higgs-family symmetry groups realizable in NHDM for any N>2 is still missing.
Here, we solve this problem for the three-Higgs-doublet model by making use of
Burnside's theorem and other results from pure finite group theory which are
rarely exploited in physics. Our method and results can be also used beyond
high-energy physics, for example, in study of possible symmetries in three-band
superconductors.Comment: 5 pages; v2: expanded introduction, some minor corrections, matches
the published versio
Sensitive detection of photoexcited carriers by resonant tunneling through a single quantum dot
We show that the resonant tunnel current through a single energy level of an
individual quantum dot within an ensemble of dots is strongly sensitive to
photoexcited holes that become bound in the close vicinity of the dot. The
presence of these holes lowers the electrostatic energy of the quantum dot
state and switches the current carrying channel from fully open to fully closed
with a high on/off ratio (> 50). The device can be reset by means of a bias
voltage pulse. These properties are of interest for charge sensitive photon
counting devices.Comment: 5 pages, 4 figure
Self-consistent calculations of quadrupole moments of the first 2+ states in Sn and Pb isotopes
A method of calculating static moments of excited states and transitions
between excited states is formulated for non-magic nuclei within the Green
function formalism. For these characteristics, it leads to a noticeable
difference from the standard QRPA approach. Quadrupole moments of the first 2+
states in Sn and Pb isotopes are calculated using the self-consistent TFFS
based on the Energy Density Functional by Fayans et al. with the set of
parameters DF3-a fixed previously. A reasonable agreement with available
experimental data is obtained.Comment: 5 pages, 6 figure
- …