incorporate hundreds of millions of semiconductor devices (transistors, diodes, optical devices, etc.). To predict the performance of the VLSI circuits, the current-voltage (I-V) characteristics of the semiconductor device are required. Semiconductor device simulation codes provide a way of predicting I-V curves as device parameters are varied, without having to fabricate the device first. (The...

The ground state energy of a polaron in a superlattice was calculated using the doubletime Green functions. The e ective mass of the polaron along the planes perpendicular to the superlattice axis was also calculated. The dependence of the ground state energy and the e ective mass along the planes perpendicular to the superlattice axis on the electron-phonon coupling constant and on the superla...

We report here on a theoretical model for the electronic structure and transport properties of superlattice nanowires, considering their cylindrical wire boundary and multiple anisotropic carrier pockets. The thermoelectric properties of superlattice nanowires made of various lead salts ~PbS, PbSe, and PbTe! are investigated as a function of the segment length, wire diameter, crystal orientatio...

Over the past two decades, semiconductor nanowires (NWs) have been intensively studied because of their wide application in electronics, photonics, chemical/ biological sensing, and energy harvesting/ conversion technologies. [ 1,2 ] Rational design and control of growth dynamics and NW architecture is of tremendous interest. [ 3 ] So far, some novel structures, such as superlattice NWs, [ 4 ] ...

Phonon optics concerns operations with high-frequency acoustic waves in solid media in a similar way to how traditional optics operates with the light beams (i.e. photons). Phonon optics experiments with coherent terahertz and sub-terahertz phonons promise a revolution in various technical applications related to high-frequency acoustics, imaging, and heat transport. Previously, phonon optics u...

Graphene, a single layer of graphite, has recently attracted considerable attention owing to its remarkable electronic and structural properties and its possible applications in many emerging areas such as graphene-based electronic devices. The charge carriers in graphene behave like massless Dirac fermions, and graphene shows ballistic charge transport, turning it into an ideal material for ci...

By using direct growth, we create a rotationally aligned MoS2/WSe2 hetero-bilayer as a designer van der Waals heterostructure. With rotational alignment, the lattice mismatch leads to a periodic variation of atomic registry between individual van der Waals layers, exhibiting a Moiré pattern with a well-defined periodicity. By combining scanning tunneling microscopy/spectroscopy, transmission el...

It is well-known that third-order dispersion (TOD) plays no role in the onset of modulation instability nonlinear Schrödinger (NLS) family systems. Here we demonstrate characteristics modulational can be dramatically altered by TOD two different systems, namely Wannier exciton mass a ZnCdSe/ZnSe semiconductor superlattice and pulse/beam propagation Kerr-like waveguide under non-slowly varying e...

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...