Po-Hao Chang

Edge currents and nanopore arrays in zigzag and chiral graphene nanoribbons as a route toward high-ZTthermoelectrics

We analyze electronic and phononic quantum transport through zigzag or chiral graphene nanoribbons (GNRs) perforated with an array of nanopores. Since local charge current profiles in these GNRs are peaked around their edges, drilling nanopores in their interior does not affect such edge charge currents while drastically reducing heat current carried by phonons in sufficiently long wires. The combination of these two effects can yield highly efficient thermoelectric devices with maximum

Giant thermoelectric effect in graphene-based topological insulators with heavy adatoms and nanopores.

ZT \simeq 11

Nonequilibrium spin texture within a thin layer below the surface of current-carrying topological insulator Bi2Se3: A first-principles quantum transport study

at liquid nitrogen temperature and

First-principles versus semi-empirical modeling of global and local electronic transport properties of graphene nanopore-based sensors for DNA sequencing

ZT \simeq 4

Proximity Band Structure and Spin Textures on Both Sides of Topological-Insulator/Ferromagnetic-Metal Interface and Their Charge Transport Probes

at room temperature achieved in

Spin-Seebeck effect on the surface of a topological insulator due to nonequilibrium spin-polarization parallel to the direction of thermally driven electronic transport

\sim 1

Topological-insulator/ferromagnetic-metal interface band and spin structure decoded by first-principles Green functions and tunneling anisotropic magnetoresistance

\mu

Spin-transfer torque in Co/Graphene/Co vertical heterostructures: A route toward magnetic memories with low write energy and ultrahigh magnetoresistance.

m long zigzag GNRs with nanopores of variable diameter and spacing between them. Our analysis is based on the

Spin-Seebeck effect due to thermally driven spin-polarized electron transport on the surface of a three-dimensional topological insulator

\pi