We present a theoretical realization of quantum spin and valley Hall effects in silicene. show that combination an electric field intrinsic spin-orbit interaction leads to phase transitions at the charge neutrality point. This transition from two dimensional topological insulator trivial insulating state is accompanied by quenching effect onset effect, providing tool experimentally tune In contrast graphene other conventional insulators, proposed silicene are accessible experiments.

Chiral tunneling through a harmonically driven potential barrier in graphene monolayer is considered this work. Since the charge carriers system are massless, chiral Dirac particles, described as Klein and highly anisotropic. To study barrier, we determine transmission probabilities for central band sidebands incident angle of electron beam changed. Furthermore, investigate width, amplitude, frequency oscillating Interestingly, perfect normal incidence that has been reported static persists...

We have investigated the electrical transport properties of Dirac electrons in a monolayer graphene sheet presence perpendicular magnetic field that is weakly and periodically modulated along one direction. find Landau levels broaden into bands their width oscillates as function band index field. determine ${\ensuremath{\sigma}}_{yy}$ component magnetoconductivity tensor for this system, which shown to exhibit Weiss oscillations. also analytically asymptotic expressions...

Motivated by the realization that periodic ripples in suspended graphene can result a potential, which also be induced interaction with substrate, we have carried out detailed investigation of electrical transport properties monolayer is modulated weak one-dimensional potential presence perpendicular magnetic field $(B)$. The modulation broadens Landau Levels into bands oscillate $B$. electronic conduction this system take place through either diffusive scattering or collisional off...

We consider rigid rotation and tilting of the anion octahedra around transition metal ions in $AB{\mathrm{O}}_{3}$ perovskites from viewpoint Jahn-Teller problem study effect crystal field nearest $A$ $B$ ion cages on single electron spectrum central ions. While octahedra, which creates degenerate manifolds ${e}_{g}$ ${t}_{2g}$, does not change with such rotations, deforms significantly ideal octahedral a way that leads to sizable splittings these manifolds. The lowering ground state energy...

A new addition to the family of Hall effects is nonlinear effect. We investigate role hexagonal warping band structure surface Dirac fermions in effect 3D topological insulators. Most relevant our study Bi2Te3, where we show that its states exhibit pronounced presence warping. this as a function Fermi energy, bandgap, strength, and temperature.

We study the quantum magnetotransport in ultrathin topological insulator films an external magnetic field considering hybridization between upper and lower surfaces of film. investigate two possible mechanisms for splitting Landau levels, Zeeman effects, show that their interplay leads to minima collisional Hall conductivities with a metal-to-insulator phase transition at charge neutrality point. plateaus arise unusual multiples e2/h. Evidence zeroth higher levels is found from temperature...

Collective excitations spectrum of Dirac electrons in mono and bilayer graphene the presence a uniform magnetic field is investigated.Analytical results for inter-Landau band plasmon within self-consistent-field approach are obtained.SdH-type oscillations that monotonic function observed both monoand bi-layer systems.The presented also compared with those obtained conventional 2DEG.The chiral nature quasiparticles systems observation π 2π Berry's phase SdH-type spectrum.

We present a theoretical study of gap opening in the zeroth Landau level gapped graphene as result pseudo-Zeeman interaction. The applied magnetic field couples with valley pseudospin degree freedom charge carriers leading to To investigate its role transport at Charge Neutrality Point (CNP), we integer quantum Hall effect (QHE) an angular presence Analytical expressions are derived for conductivity using Kubo-Greenwood formula. also determine longitudinal elastic impurity scattering first...

We present the collective excitations spectrum (magnetoplasmon spectrum) of Dirac electrons in a weakly modulated single graphene layer presence uniform magnetic field. consider electric modulation one dimension and field applied perpendicular to graphene. derive analytical results for intra-Landau-band plasmon within self-consistent-field approach. find Weiss oscillations magnetoplasmon which is primary focus this work. Results are presented as function inverse These also compared with...

Theoretical study of electron wave packet dynamics in topological insulator (TI) thin films is presented. We have investigated real space trajectories and spin packets TI films. Our focus on the role hybridization between electronic states two surfaces. This allows us to access crossover regime a thick film with no finite hybridization. show that undergoes side-jump motion addition zitterbewegung. The oscillation frequency zitterbewegung can be tuned by strength hybridization, which turn...

We first derive the energy dispersion of bilayer ${\mathrm{MoS}}_{2}$ in presence a perpendicular electric field ${E}_{z}$. show that band gap and layer splitting can be controlled by Away from $k$ point, intrinsic spin-orbit coupling increases conduction but is weakly affected valence band. then analyze structure magnetic $B$ ${E}_{z}$, including spin valley Zeeman terms, evaluate Hall longitudinal conductivities. discuss numerical results as functions fields ${E}_{z}$ for finite...

We present a theoretical study of the quantum magnetocapacitance an ultrathin topological insulator film in external magnetic field. The is undertaken to investigate interplay Zeeman interaction with hybridization between upper and lower surfaces thin film. Determining density states, we find that electron-hole symmetry broken when energies are varied relative each other. This leads change character at charge neutrality point. further show presence both exhibits beating low splitting...

Zero-resistance states (ZRS) are normally associated with superconducting and quantum Hall phases. Experimental detection of ZRS in two-dimensional electron gas (2DEG) systems irridiated by microwave(MW) radiation a magnetic field has been quite surprise. We develop semiclassical transport formalism to explain the phenomena. find sequence Zero-Resistance States inherited from suppression Shubnikov-de Haas (SdH) oscillations under influence high-frequency large amplitude microwave radiation....

Theoretical investigation of thermodynamic properties an electrically modulated graphene monolayer in the presence a perpendicular magnetic field B is presented. This work aimed at determining modulation-induced effects on graphene. The results obtained are compared with those conventional two-dimensional electron gas (2DEG) systems realized semiconductor heterostructures. one-dimensional periodic potential, due to electric modulation lifts degeneracy Landau levels and converts them into...

We determine the optical response of topological insulator thin films in presence a quantizing, external magnetic field. explicitly take into account hybridization between states top and bottom surface. The interplay Zeeman energies gives rise to normal phases phase transitions them. two at transition point is investigated. show that difference magneto-optical can be used distinguish from system. Further, also allows us gap generated by surface films.

In this work, we determine the effects of temperature on magnetoplasmon spectrum an electrically modulated graphene monolayer as well a two-dimensional electron gas (2DEG). The intra-Landau band within self-consistent field approach is investigated for both aforementioned systems. Results obtained not only exhibit Shubnikov–de Haas (SdH) oscillations but also commensurability (Weiss oscillations). These are periodic function inverse magnetic field. We find that oscillations, SdH and Weiss,...

We present a theoretical study of the electronic structure modulated graphene in presence perpendicular magnetic field. The density states and bandwidth for Dirac electrons this system are determined. appearance unusual Weiss oscillations is main focus work.