We use a hybrid k dot p theory - tight binding (HkpTB) model to describe interlayer coupling simultaneously in both Bernal and twisted graphene structures. For Bernal-aligned interfaces, HkpTB is parametrized using the full Slonczewski-Weiss-McClure (SWMcC) Hamiltonian of graphite, which then used refine commonly minimal for by deriving additional terms that reflect all details SWMcC graphite. ...

Abstract The presence of periodic modulation in graphene leads to a reconstruction the band structure and formation minibands. In an external uniform magnetic field, fractal energy spectrum called Hofstadter butterfly is formed. Particularly interesting this regard are superlattices with tunable strength, such as electrostatically induced ones graphene. We perform quantum transport modeling gat...

The coupling of Bloch oscillations to longitudinal optical phonons is investigated in a narrow-well In0.53Ga0.47As/In0.52Al0.48As superlattice. A strong increase of coherent phonon amplitudes is observed when the Bloch oscillations are subsequently tuned into resonance with different optical phonon modes. The rapid dephasing of the Bloch oscillations due to field induced tunneling from the weak...

We obtain a general result for the Lamb shift of excited states of multilevel atoms in inhomogeneous electromagnetic structures and apply it to study atomic hydrogen in inverse-opal photonic crystals. We find that the photonic-crystal environment can lead to very large values of the Lamb shift, as compared to the case of vacuum. We also suggest that the position-dependent Lamb shift should exte...

We develop a semiclassical theory of the nondegenerate parametric amplification in a single miniband of superlattice. We present the formulas describing absorption and gain of signal and idler fields in superlattice and analyze the limiting cases of strong and weak dissipation. We show how the well-known Manley-Rowe relations arise in the tight-binding lattice in the weak dissipation limit. Our...

We show that superlattices can be formed in the ternary and quaternary ln(GaAl)As alloys on InP by molecular beam epitaxy without mechanical shuttering. Periodic ordering is produced by rotation of the substrate through the naturally nonuniform distribution of beam fluxes at the rotating substrate. The growth rate and substrate rotation rate together determine the superlattice period which is m...

Studying the tight binding model in an applied rational magnetic field (H) we show that graphene there are very unusual Landau levels situated immediate vicinity of saddle point (M-point) energy epsilon_M. around $\epsilon_M$ broadened into minibands (even relatively weak fields ~40-53 T) with maximal width reaching 0.4-0.5 separation between two neighboring though at all other energies is prac...

Semiconductor superlattice frequency multipliers have emerged as a nonlinear medium able to generate radiation in wide range. This property facilitates the potential of sources suitable for sensing and spectroscopy applications. In this study, we further investigate consequences on harmonic generation multiplier after excitation by an input signal oscillating at different frequencies. Here prov...

Twistronic heterostructures have recently emerged as a new class of quantum electronic materials with properties determined by the twist angle between adjacent two-dimensional materials. Here, we study moir\'e superlattice minibands in graphene (G) encapsulated hexagonal boron nitride (hBN) an almost perfect alignment both top and bottom hBN crystals. We show that, for such orientation unit cel...