In this work we implement a tight-binding calculation of the energy bands of silicon. This traditional method is still employed as a useful approximation for the electronic motion in solids. The tight-binding wavefunctions are taken as linear combinations of atomic orbitals located at each atom in the crystal, based on phase factors e(ik·R) (R are the position of such atoms) for coefficients. T...

The observation of replica bands in single-unit-cell FeSe on SrTiO3 (STO)(001) by angle-resolved photoemission spectroscopy (ARPES) has led to the conjecture that the coupling between FeSe electrons and the STO phonons are responsible for the enhancement of Tc over other FeSe-based superconductors. However the recent observation of a similar superconducting gap in single-unit-cell FeSe/STO(110)...

A hallmark of graphene is its unusual conical band structure that leads to a zero-energy band gap at a single Dirac crossing point. By measuring the spectral function of charge carriers in quasi-freestanding graphene with angle-resolved photoemission spectroscopy, we showed that at finite doping, this well-known linear Dirac spectrum does not provide a full description of the charge-carrying ex...

The low-energy electronic properties of a few graphite layers with AA and ABC stacking under application of the electric field (F), perpendicular to the layers, are explored through the tight-binding model. They strongly depend on the interlayer interactions, the stacking sequences, the layer numbers, and the field strength. In the absence or presence of F, the AA-stacked N-layer graphites (N 1...

Constrained Relativistic Mean Field (RMF) calculations have been carried out to estimate excitation energies relative to the ground state for superdeformed bands in the mass regions A ∼ 190 and A ∼ 150. It is shown that RMF theory is able to successfully reproduce the recently measured superdeformed minima in Hg and Pb nuclei. Superdeformation has become the recent years one of the most interes...

Low-energy moir\'e flat bands in magic-angle twisted bilayer graphene (tBG) have demonstrated incredible potential to exhibit rich exotic quantum phenomena. Theoretically, the of tBG are based on extended structures, i.e., patterns with periodic boundary conditions. However, a fundamental question whether can exist reduced structure symmetry, such as sample edges, remains unanswered. Here, via ...

Abstract Integer quantum Hall (IQH) states and anomalous (QAH) show the same static dc response but distinct dynamical ac response. In particular, conductivity profile σ yx ( ω ) is sensitive to band shape of QAH states. For example, dispersive bands shows resonance without a sign change at gap while IQH cyclotron energy. We argue by flattening bands, should recover that flat Landau in IQH, thu...

Although visible and near-infrared reflectance spectra contain absorption bands that are characteristic of the composition and structure of the absorbing species, deconvolving a complex spectrum is nontrivial. An improved approach to spectral deconvolution is presented here that accurately represents absorption bands as discrete mathematical distributions and resolves composite absorption featu...

The values of the quantum mechanical overlap integrals between the ~-orbitals of the superimposed nucleotide bases of DNA show that there is a non-negligible interaction between these bases. The energy levels of the MO's of the adenine-thymine and guanine-cytosine base pairs, known from the literature, differ from each other only by an amount -~0.09 8, which is the width of the second filled en...

The electronic structure of the Fe-based superconductor Ba(0.6)K(0.4)Fe(2)As(2) is studied by means of angle-resolved photoemission. We identify dispersive bands crossing the Fermi level forming hole-like (electron-like) Fermi surfaces (FSs) around Γ (M) with nearly nested FS pockets connected by the antiferromagnetic wavevector. Compared to band structure calculation findings, the overall band...