Thermodynamic currents, such as energy, heat, and entropy production, can fluctuate significantly at the nanoscale. However, some less than others. Hyperaccurate currents are defined those which least, in sense that they maximize signal-to-noise ratio (precision). In this Letter we analytically determine what hyperaccurate quantum thermoelectrics, modeled by coherent transport Landauer-B\"uttik...

The environmental influence is inevitable but often ignored in the study of electronic transport properties small-scale systems. Such an environment-mediated interaction can generally be described by a parity-time symmetric non-Hermitian system with balanced distribution physical gain and loss. It quite known literature that along conventional junction current, another current called bias-drive...

The combined effects of an asymmetric (square or V-shaped) notch and uniaxial strain are studied in a zigzag graphene nanoribbon (ZGNR) device using a generalized tight-binding model. The spin-polarization and conductance-gap properties, calculated within the Landauer–Büttiker formalism, were found to be tunable for uniaxial strain along the ribbon-length and ribbon-width for an ideal ZGNR and ...

We report the transport behavior of an open-end metallic single wall carbon nanotube (SWCNT) with and without local structural defects using the non-equilibrium Green’s functions approach together with the density functional theory (DFT). The transmission spectra and the projected density of states for the devices such as SWCNT (3, 3), (4, 4), (5, 5) and (6, 6) with and without defects were com...

When a three-dimensional ferromagnetic topological insulator thin film is magnetized out-of-plane, conduction ideally occurs through dissipationless, one-dimensional (1D) chiral states that are characterized by a quantized, zero-field Hall conductance. The recent realization of this phenomenon, the quantum anomalous Hall effect, provides a conceptually new platform for studies of 1D transport, ...

We study transport of fermions in a system composed of a short optical lattice connecting two finite atomic reservoirs at different filling levels. The average equilibration current through the optical lattice, for strong latticereservoir coupling and finite temperatures, is calculated within the Landauer formalism using a nonequilibrium Green’s functions approach. We moreover determine quantum...

Thermoelectric effects, such as the generation of a particle current by a temperature gradient, have their origin in a reversible coupling between heat and particle flows. These effects are fundamental probes for materials and have applications to cooling and power generation. Here, we demonstrate thermoelectricity in a fermionic cold atoms channel in the ballistic and diffusive regimes, connec...

We numerically investigate Andreev reflection in a graphene ring with one normal conducting and one superconducting lead by solving the Bogoliubov-de Gennes equation within the Landauer-Büttiker formalism. By tuning chemical potential and bias voltage, it is possible to switch between regimes where electron and hole originate from the same band (retroconfiguration) or from different bands (spec...

We investigate the influence of spin-orbit interaction on ballistic transport through chaotic cavities by using semiclassical methods. Our approach is based on the Landauer formalism IBM J. Res. Dev. 1, 223 1957 ; 32, 306 1988 and the Fisher-Lee relations Phys. Rev. B 23, 6851 1981 , appropriately generalized to spin-orbit interaction, and a semiclassical representation of Green’s functions. We...

Electron transport in branched semiconductor nanostructures provides many possibilities for creating fundamentally new devices. We solve the problem of its calculation using a quantum network model. The proposed scheme consists three computational parts: S-matrix junction, terms junctions’ S-matrices, electric currents through based on S-matrix. To calculate we propose scattering boundary condi...