We show that a central ${1/r}^{n}$ singular potential (with $n>~2)$ is renormalized by one-parameter square-well counterterm; low-energy observables are made independent of the width adjusting strength. find closed form expression for renormalization-group evolution counterterm.

Methylammonium lead iodide perovskite (MAPbI3) is a promising material for photovoltaic devices. A modification of MAPbI3 into confined nanostructures expected to further increase efficiency solar energy conversion. Photoexcited dynamic processes in quantum dot (QD) have been modeled by many-body perturbation theory and nonadiabatic dynamics. photoexcitation followed either exciton cooling (EC), its radiative (RR) or nonradiative recombination (NRR), multiexciton generation (MEG) processes....

Intrinsic constraints on efficient photoluminescence (PL) from smaller alkene-capped silicon nanocrystals (SiNCs) put limits potential applications, but the root cause of such effects remains elusive. Here, plasma-synthesized colloidal SiNCs separated into monodisperse fractions reveal an abrupt size-dependent partitioning multilevel PL relaxation, which we study as a function temperature. Guided by theory and simulation, explore role resonant phonon interactions with "minigaps" that emerge...

We find that for a large enough strange quark mass, ${m}_{s}^{2}/4\ensuremath{\mu}\ensuremath{\Delta}>2/3(1\ensuremath{-}0.023)$ ($\ensuremath{\mu}$ is the number chemical potential, $\ensuremath{\Delta}$ superconducting gap), kaon condensed color flavor locked (CFL) phase of asymptotically dense strongly interacting 3 matter unstable with respect to spontaneous generation currents Nambu Goldstone bosons due breaking baryon symmetry and hypercharge in $\mathrm{CFL}{K}^{0}$ ground state....

We study the effective field theory for fermions in color-flavor locked (CFL) phase of high density QCD. The contains a flavor nonet baryons interacting with pseudoscalar Goldstone bosons as well singlet scalar boson. is similar to chiral perturbation one-baryon sector. explain how incorporate quark mass terms and spectrum function strange mass. Without meson condensation gapless baryon modes appears if exceeds critical value ms2/(2pF)=Δ, where pF Fermi momentum Δ gap limit. show that kaon...

We use the density functional theory (DFT) combined with many-body perturbation to derive expressions for rates of optical photon→exciton and photon→bi-exciton processes in nanoparticles, quantum efficiency, all leading order screened Coulomb interaction between Kohn–Sham quasiparticles. Also, we calculate exciton→bi-exciton due impact ionisation (II) mechanism Si29H36 dots (QDs) both crystalline amorphous core structures, quasi-one dimensional (1-D) arrays constructed from these QDs....

We consider $O({\ensuremath{\alpha}}_{s})$ corrections to the squared masses of pseudo-Goldstone excitations about ground state dense quark matter. show that these contributions tend destabilize vacuum, leading a surprisingly complex phase structure for matter as function mass, even small ${\ensuremath{\alpha}}_{s}$. In particular we find two new phases CFL possibly relevant real world, which ${\overline{\ensuremath{\theta}}}_{\mathrm{Q}\mathrm{C}\mathrm{D}}=\ensuremath{\pi}/2$.

We investigate the issue of charge neutrality $\mathrm{CFL}{K}^{0}$ phase dense quark matter using low energy effective theory high density QCD. show that local electric and color ground state in a homogeneous superconducting medium follows from its dynamics. also consider situation spatially inhomogeneous medium, such as may be found neutron star core. find spatial inhomogeneity results generation fields, positrons and/or electrons present state. estimate concentration charged leptons to...

We study the stability of kaon condensed color-flavor locked (CFL) phase dense quark matter with regard to formation a nonzero Goldstone boson current. In there is an electrically charged fermion which becomes gapless near ${\ensuremath{\mu}}_{s}^{(1)}\ensuremath{\simeq}1.35\ensuremath{\Delta}$ and neutral ${\ensuremath{\mu}}_{s}^{(2)}\ensuremath{\simeq}1.61\ensuremath{\Delta}$. Here, ${\ensuremath{\mu}}_{s}={m}_{s}^{2}/(2{p}_{F})$ shift in Fermi energy due strange mass ${m}_{s}$...

We compute free energy of quark matter at asymptotically high baryon number density in the presence nonzero strange mass including dynamics pseudo Nambu-Goldstone bosons due to chiral symmetry breaking, extending previously existing analysis based on perturbative expansion ${m}_{s}^{2}/4\ensuremath{\mu}\ensuremath{\Delta}.$ demonstrate that $\mathrm{C}\mathrm{F}\mathrm{L}{K}^{0}$ state has lower than symmetric CFL for $0<{m}_{s}^{2}/4\ensuremath{\mu}\ensuremath{\Delta}<2/3$. also...

The scalar heavy quark content of the nucleon, ${\cal M}_q = \bra{N} m_q \bar q \ket{N},$ is relevant for computing interaction dark matter candidates with ordinary matter, while M}_s$ important predicting properties dense matter. We compute M}_q$ in perturbative QCD to ${\cal{O}}{(\alpha^3)}.$ As one goes from M}_t$ M}_c$ leading order contribution decreases as number light quarks dropping, radiative corrections grow and are all positive. source uncertainty calculation due poorly known...

Semiconductor nanomaterials allow tuning their optical and electronic properties as a function of morphology structural disorder. Quantum dots (QD), arrays quantum dots, nanowires demonstrate strong dependence absorption spectra on the morphological variables. Organization QDs into leads to increase in oscillator strengths overall brightening transitions. Electronic structure calculations support search efficient several amorphous crystalline silicon nanosystems.

Multiple exciton generation (MEG) in nanometer-sized hydrogen-passivated silicon nanowires (NWs), and quasi two-dimensional nanofilms depends strongly on the degree of core structural disorder as shown by perturbative many-body quantum mechanics calculations based density functional theory simulations. Working to second order electron–photon coupling screened Coulomb interaction, we calculate efficiency (QE), average number excitons created a single absorbed photon, Si29H36 dots (QDs) with...

We use the Boltzmann transport equation (BE) to study time evolution of a photoexcited state, including phonon-mediated exciton relaxation, multiple generation (MEG), and energy-transfer processes. BE collision integrals are derived using Kadanoff–Baym–Keldysh many-body perturbation theory (MBPT) based on density functional (DFT) simulations, effects. apply method nanostructured p–n junction composed 1 nm hydrogen-terminated Si quantum dot (QD) doped with two phosphorus atoms (Si36P2H42)...

We consider a polarized Fermi gas in the unitarity limit. Results are calculated analytically up to next-to-leading order an expansion about $d=4$ spatial dimensions. find first transition from superfluid normal phase. The critical chemical potential asymmetry for this phase is $\ensuremath{\delta}{\ensuremath{\mu}}_{c}=\frac{2\ensuremath{\mu}}{\ensuremath{\epsilon}}(1\ensuremath{-}0.467\ensuremath{\epsilon})$, where $\ensuremath{\epsilon}=4\ensuremath{-}d$ parameter and $\ensuremath{\mu}$...

Using $\ensuremath{\epsilon}$ expansion technique proposed by Nishida and Son [Phys. Rev. Lett. 97, 050403 (2006)] we derive an effective Lagrangian (Ginzburg-Landau-type functional) of the degenerate unitary Fermi gas to next-to-leading order in $\ensuremath{\epsilon}$. It is demonstrated that for many realistic situations it sufficient retain leading terms derivative expansion. The functional used study vortex structure symmetric gas, interface between normal superfluid phases polarized...

We study the fermion sign problem in a theory of non-relativistic fermions with spin-independent repulsive interaction. work polar co-ordinates momentum space, which makes it straightforward to keep only low-energy degrees freedom close Fermi surface. This is sufficient for purpose calculating many physically important observables. find indications that this effective will be weaker than full theory, so properties could calculated by modifying action make positive semi-definite and including...

Using the $\ensuremath{\varepsilon}$-expansion technique, we compute $\ensuremath{\eta}/s$, where $\ensuremath{\eta}$ is shear viscosity and $s$ entropy density of normal phase unitary Fermi gas in $d=4\ensuremath{-}\ensuremath{\varepsilon}$ dimensions to leading order (LO) $\ensuremath{\varepsilon}$. We use kinetic theory approach solve transport equations for a medium perturbed by hydrodynamic flow. The collision integrals are calculated ${\ensuremath{\varepsilon}}^{2}$, which LO. LO...

The work provides computational arguments in support of excitonic approach for the treatment photo-induced processes semiconductor quantum dots. non-radiative relaxation, recombination, and photo-luminescence yield are computed a range atomistic models dots (QDs) confinement regime. (EX) is compared to independent orbital approximation (IOA) approach. Both approaches address dissipation electronic energy from degrees freedom thermal vibrations lattice. difference two appears energies states...

Using the $\ensuremath{\varepsilon}$ expansion proposed in Y. Nishida and D. T. Son [Phys. Rev. Lett. 97, 050403 (2006)], we calculate density correlation function dynamic structure of unitary Fermi gas at zero temperature to next-to-leading order for excitation energies below quasiparticle threshold.

ABSTRACTIn this study, a computational examination of the electronic transitions and through-space energy transfer processes lends insight into experimental spectra redox-sensitive rhodamine–anthraquinone dyad. Electronic were calculated using density functional theory (DFT) time-dependent DFT (TDDFT) based on models optimised from single-crystal X-ray diffraction (XRD) ion positions. calculations performed gas-phase Vienna Ab Initio Software Package (VASP) with developed by Perdew, Burke,...

Previous work on high-density QCD suggests that the ground state configuration in presence of a nonzero neutrino chemical potential consists color-flavor locked matter plus homogeneous condensate neutral and positive kaons. We consider here stability this toward production charge-separated mixed phase, find system is indeed stable against such heterogenous configuration. identify critical value fine structure constant which would allow for phase separation. also derive dispersion relations...

Multiple exciton generation (MEG) in nanometer-sized hydrogen-passivated silicon nanowires (NWs), and quasi two-dimensional nanofilms strongly depends on the degree of core structural disorder as shown by many-body perturbation theory (MBPT) calculations based density functional (DFT) simulations. Working to second order electron-photon coupling screened Coulomb interaction we calculate quantum efficiency (QE), average number excitons created a single absorbed photon, ${\rm Si}_{29}{\rm...