We theoretically investigate the thermoelectric transport in nanoribbon of magnetic topological insulator with a domain wall linear and nonlinear regimes. The Lorenz number $L$, Seebeck coefficients ${S}_{c}$, thermoelectrical figure merit $ZT$ response regime are obtained by nonequilibrium Green's function method. These strongly depend on configuration wall, that is, can regulate performance. also discuss effect width thickness coefficient. results show N\'eel-type is more dependent size...

We theoretically study the electronic transport through a ferromagnet-Ising superconductor junction. A tight-binding Hamiltonian describing Ising is presented. Then by combining nonequilibrium Green's function method, expressions of Andreev reflection coefficient and conductance are obtained. strong magnetoanisotropic spin-triplet shown, period $\ensuremath{\pi}$ instead $2\ensuremath{\pi}$ as in conventional system. demonstrate significant increase for single-band superconductor....

The thermoelectric properties of the surface states in three-dimensional topological insulator nanowires are studied. Seebeck coefficients ${S}_{c}$ and dimensionless thermoelectrical figure merit $ZT$ obtained by using tight-binding Hamiltonian combined with nonequilibrium Green's-function method. They strongly dependent on gate voltage longitudinal perpendicular magnetic fields. By changing or fields, values can be easily controlled. At zero field voltage, at large nonzero has a value....

It is widely accepted that both backscattering and dissipation cannot occur in topological systems because of the protection. Here we show thermal can quantum Hall (QH) regime graphene presence sources, although plateaus zero longitudinal resistance still survive. Dissipation appears along downstream chiral flow direction constriction plateau regime, but it occurs mainly bulk transition regime. In addition, processes are accompanied with evolution energy distribution from non-equilibrium to...

In this paper, the effects of CN point defects on thermoelectric properties GaN nanowires (NWs) were investigated by using first principles calculation. It is found that can increase electronic density states (DOS) near Fermi level NWs. The calculation results indicate are beneficial for improving power factor (PF) addition, it was electrical conductivity At same time, also has impact thermal and Seebeck coefficient will NWs from 0.41 × 10 14Wm−1k−1s−1 to 1.15 at T = 700 K. it's as...

We investigate the thermal transport properties of a quantum anomalous Hall insulator nanoribbon covered by superconductors. Due to peculiar chiral Majorana fermion (CMF) edge states, we found half-integer quantized conductance plateau. Different from ordinary superconductor which conducts electricity but does not conduct heat, in insulator--topological junction, CMF occurs at boundary topological carries heat left right. A with Chern number $\mathcal{N}=\ifmmode\pm\else\textpm\fi{}1$ has...

Abstract Recently discovered Weyl semimetals have received considerable research interest due to the exotic fermion-like excitations and nontrivial π Berry phase near band degenerate points. Here we show that by constructing a semimetal p – n junction restricting fermions into closed orbits with electric magnetic confinements, acquired can be controlled flexibly. This brings out two effects on electron transport through junction: when is integer multiples of an obvious shift observed in...

Topological nodal-line semimetals (TNLSMs) are a new state of quantum matter. It has one-dimensional energy band intersections where the conduction and valence cross to form one or more nodal rings. Here, based on Landauer-B\"uttiker formula combined with nonequilibrium Green's function method, we investigate electron transport through TNLSM nanowires under perpendicular magnetic field. We theoretically calculate conductance find that it is essentially different from other topological...

The spin Nernst effect describes a transverse current induced by the longitudinal thermal gradient in system with spin-orbit coupling. Here we study mesoscopic four-terminal cross-bar Weyl semimetal device under perpendicular magnetic field. Because is tensor, it has three elements direction pointing to x, y and z directions when flows along lead. By using tight-binding Hamiltonian combined nonequilibrium Green's function method, of leads coefficients are obtained. results show that an...

This paper calculates the electron impact excitation rate coefficients from ground term 2s22p2 3P to excited terms of 2s22p2, 2s2p3, 2s22p3s, 2s22p3p, and 2s22p3d configurations N II. In calculations, multiconfiguration Dirac–Fork wave functions have been applied describe target-ion states relativistic distorted-wave calculation has performed generate fine-structure collision strengths. The strengths are then averaged over a Maxwellian distribution velocities in order effective calculated...

Thermoelectric effects in quantum systems have been focused recent years. energy conversion study of with edge states, such as Hall insulators and spin insulators, is one the most important frontier topics material science condensed-matter physics. Based on previous paper (Gresta Phys Rev Lett 123:186801, 2019), we further investigated linear nonlinear thermoelectric transport properties helical states coupled double nanomagnet, calculated Seebeck coefficients [Formula: see text]...

Excitation energies and electron impact excitation strengths from the ground states of Ni-, Cu- Zn-like Au ions are calculated. The collision computed by a 213-levels expansion for Ni-like ion, 405-levels Cu-like ion 229-levels ion. Configuration interactions taken into account all levels included. target state wavefunctions calculated using Grasp92 code. continuum orbits in distorted-wave approximation, which direct exchange potentials among electrons Excellent agreement is found when...

Recently discovered topological nodal-line semimetals (TNLSMs) have received considerable research interest due to their rich physical properties and potential applications. TNLSMs the particular band structure lead many novel properties. Here we theoretically study thermoelectric transport of a two-terminal pristine TNLSM nanowires TNLSMsp-n-pjunctions. The Seebeck coefficientsScand thermoelectrical figure meritZTare calculated based on Landauer-Büttiker formula combined with nonequilibrium...

As a common impurity, carbon was related to the physical properties of GaN-based materials closely. By using density functional theory and Boltzmann transport theory, electronic structure thermoelectric doped GaN were studied. The band structure, states calculated. Comparing with intrinsic bulk-GaN, (1) It found that Fermi level moves down, gap becomes narrow for CN point defects. (2) Power factors become decrease, while thermal conductivity decreases more significantly. Therefore,...

The electron impact excitation(EIE) cross sections of He atom and He-like Fe24+, Xe52+ U90+ ions from the metastable 1s2s3S1 to all 1snl(n=2,3; l=s,p,d) states are calculated systematically by using fully relativistic distorted-wave (RDWB) program developed our group recently. effects Breit interaction on EIE isoelectronic sequences at different energies incident electrons is studied, some important conclusions summarized, which can be extended other highly charged ions. Also, comparison...

Abstract The Nernst effect is the transverse mode of thermoelectric transport, in which a longitudinal thermal gradient induces current conductor while under perpendicular magnetic field. Here mesoscopic topological nodal-line semimetals (TNLSMs) system four-terminal cross-bar with spin–orbit coupling field studied. coefficient N c two non-equivalen connection modes ( k z – y and x mode) calculated based on tight-binding Hamiltonian combined nonequilibrium Green’s function method. When...

We study the impact of size effect and varying perpendicular magnetic field B on transport properties topological nodal-line semimetals (TNLSMs) by using Landauer-Büttiker formula combined with nonequilibrium Green's function. theoretically calculate band structure, conductance G local density states (LDOS) TNLSMs nanowire. The results show that both application play a crucial role in electron TNLSMs. find step height width plateau are closely related to system. For system large TNLSMs, low...

Abstract Andreev reflection is an important quantum tunneling phenomenon in the conductor-superconductor junction. The coefficients T AR of a hybrid system with s -wave superconductor connected by topological nodal-line semimetals (TNLSMs-SC junction system) calculated theoretically using Landauer–Büttiker formula combined nonequilibrium Green’s function method. results show that when direction boundary state electron and incident are same, only bulk states TNLSMs involve system, enhance...