34 research outputs found
Near-field Electrodynamics of Atomically Doped Carbon Nanotubes
We develop a quantum theory of near-field electrodynamical properties of
carbon nanotubes and investigate spontaneous decay dynamics of excited states
and van der Waals attraction of the ground state of an atomic system close to a
single-wall nanotube surface. Atomic spontaneous decay exhibits vacuum-field
Rabi oscillations -- a principal signature of strong atom-vacuum-field
coupling. The strongly coupled atomic state is nothing but a 'quasi-1D cavity
polariton'. Its stability is mainly determined by the atom-nanotube van der
Waals interaction. Our calculations of the ground-state atom van der Waals
energy performed within a universal quantum mechanical approach valid for both
weak and strong atom-field coupling demonstrate the inapplicability of
conventional weak-coupling-based van der Waals interaction models in a close
vicinity of the nanotube surface.Comment: Book Chapter. 50 pages, 11 figures. To be published in "Nanotubes:
New Research", edited by F.Columbus (Nova Science, New York, 2005
Controlling Single-Photon Emission with Ultrathin Transdimensional Plasmonic Films
We study theoretically the properties of a two-level quantum dipole emitter
near an ultrathin transdimensional plasmonic film. Our model system mimics a
solid-state single-photon source device. Using realistic experimental
parameters, we compute the spontaneous and stimulated emission intensity
profiles as functions of the excitation frequency and film thickness, followed
by the analysis of the second-order photon correlations to explore the photon
antibunching effect. We show that ultrathin transdimensional plasmonic films
can greatly improve photon antibunching with thickness reduction, which allows
one to control quantum properties of light and make them more pronounced.
Knowledge of these features is advantageous for solid-state single-photon
source device engineering and overall for the development of the new integrated
quantum photonics material platform based on the transdimensional plasmonic
films.Comment: 19 pages, 3 figures, 68 reference
Far- and Near-Field Heat Transfer in Transdimensional Plasmonic Film Systems
We compare the confinement-induced nonlocal electromagnetic response model to
the standard local Drude model routinely used in plasmonics. Both of them are
applied to study the heat transfer for transdimensional plasmonic film systems.
The former provides greater Woltersdorff length in the far-field and larger
film thicknesses at which heat transfer is dominated by surface plasmons,
leading to enhanced near-field heat currents. Our results show that the
nonlocal response model is capable of making a significant impact on the
understanding of the radiative heat transfer in ultrathin films
Crystal Phases of Charged Interlayer Excitons in van der Waals Heterostructures
Throughout the years, strongly correlated coherent states of excitons have
been the subject of intense theoretical and experimental studies. This topic
has recently boomed due to new emerging quantum materials such as van der Waals
(vdW) bound atomically thin layers of transition metal dichalcogenides (TMDs).
We analyze the collective properties of charged interlayer excitons observed
recently in bilayer TMD heterostructures. We predict new strongly correlated
phases - crystal and Wigner crystal - that can be selectively realized with TMD
bilayers of properly chosen electron-hole effective masses by just varying
their interlayer separation distance. Our results open up new avenues for
nonlinear coherent control, charge transport and spinoptronics applications
with quantum vdW heterostuctures.Comment: 34 pages, 8 figures, 57 reference
Photon Bose-Condensate as a Tunable Terahertz Laser Source without Inversion
We develop a theoretical model for a tunable coherent terahertz radiation
source based on the long-lived Bose condensate of photons. In the device we
propose, the original photon pumping is performed incoherently by a blackbody
radiation emitter. The photons thus produced Bose-condense by the inelastic
relaxation on a two-dimensional electron gas in a perpendicular magnetostatic
field. The process involves neither population inversion nor light wave
amplification the standard laser sources are built on. The coherence and
tunability of the light emitted by such a photon condensate are provided and
supported by the discrete spectrum of the electron gas in the quantizing
magnetic field. The device is a compact-size semiconductor crystal. We propose
the design and perform the realistic calculations of the physical properties
and limiting factors for the terahertz photon Bose-condensate resonator. We
show that our terahertz source can deliver the highly coherent light emission
in the frequency range of 3-30 THz for the magnetic field induction of the
order of 2 T, with the upper emission frequency limit adjustable by the
strength of the magnetic field applied.Comment: Main text (15 pages, 7 figures, 52 references) + Supplementary
materials (27 pages, 27 figures, 10 references