331 citations · 1.8k across the 54 of their papers we have counts for
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Bismuth antiphase domain wall: A three-dimensional manifestation of the Su-Schrieffer-Heeger model
Jinwoong Kim, Cheng-Yi Huang, Hsin Lin +2
The Su, Schrieffer and Heeger (SSH) model, describing the soliton excitations in polyacetylene due to the formation of antiphase domain walls (DW) from the alternating bond pattern…
Elasto-Dynamical Induced Spin and Charge Pumping in Bulk Heavy Metals
Farzad Mahfouzi, Nicholas Kioussis
Analogous to the Spin-Hall Effect (SHE), {\it ab initio} electronic structure calculations reveal that acoustic phonons can induce charge (spin) current flowing along (normal to) i…
Spin transfer torque in MnGa-based ferrimagnetic tunnel junctions from first principles
Maria Stamenova, Plamen Stamenov, Farzad Mahfouzi +3
We report on first-principles calculations of spin-transfer torque (STT) in epitaxial magnetic tunnel junctions (MTJs) based on ferrimagnetic tetragonal MnGa electrodes, both a…
Microscopic Origin of Spin-Orbit Torque in Ferromagnetic Heterostructures: A First Principles Approach
Farzad Mahfouzi, Rahul Mishra, Po-Hao Chang +2
We present an {\it ab initio}-based theoretical framework which elucidates the origin of the spin-orbit torque (SOT) in Normal-Metal(NM)/Ferromagnet(FM) heterostructures. The SOT i…
Termination Dependent Topological Surface States in Nodal Loop Semimetal HfP2
Christopher Sims, M. Mofazzel Hosen, Hugo Aramberri +11
Symmetry plays a major role in all disciplines of physics. Within the field of topological materials there is a great interest in understanding how the mechanics of crystalline and…
Damping and Anti-Damping Phenomena in Metallic Antiferromagnets: An ab-initio Study
Farzad Mahfouzi, Nicholas Kioussis
We report on a first principles study of anti-ferromagnetic resonance (AFMR) phenomena in metallic systems [MnX (X=Ir,Pt,Pd,Rh) and FeRh] under an external electric field. We demon…
First Principles Study of Angular Dependence of Spin-Orbit Torque in Pt/Co and Pd/Co Bilayers
Farzad Mahfouzi, Nicholas Kioussis
Spin-orbit torque (SOT) induced by spin Hall and interfacial effects in heavy metal(HM)/ferromagnetic(FM) bilayers has recently been employed to switch the magnetization direction…
Intrinsic Damping Phenomena from Quantum to Classical Magnets:An ab-initio Study of Gilbert Damping in Pt/Co Bilayer
Farzad Mahfouzi, Jinwoong Kim, Nicholas Kioussis
A fully quantum mechanical description of the precessional damping of Pt/Co bilayer is presented in the framework of the Keldysh Green function approach using {\it ab initio} elect…
Current Induced Damping of Nanosized Quantum Moments in the Presence of Spin-Orbit Interaction
Farzad Mahfouzi, Nicholas Kioussis
Motivated by the need to understand current-induced magnetization dynamics at the nanoscale, we have developed a formalism, within the framework of Keldysh Green function approach,…
Ferromagnetic Damping/Anti-damping in a Periodic 2D Helical surface; A Non-Equilibrium Keldysh Green Function Approach
Farzad Mahfouzi, Nicholas Kioussis
In this paper, we investigate theoretically the spin-orbit torque as well as the Gilbert damping for a two band model of a 2D helical surface state with a Ferromagnetic (FM) exchan…
Antidamping spin-orbit torque driven by spin-flip reflection mechanism on the surface of a topological insulator: A time-dependent nonequilibrium Green function approach
Farzad Mahfouzi, Branislav K. Nikolić, Nicholas Kioussis
Motivated by recent experiments observing spin-orbit torque (SOT) acting on the magnetization of a ferromagnetic (F) overlayer on the surface of a three-dimensional topol…
Two dimensional topological insulators with tunable band gaps: HgTe and HgSe monolayers
Jin Li, Chaoyu He, Lijun Meng +7
Employing ab initio electronic calculations, we propose a new type of two-dimensional (2D) topological insulator (TI), monolayer (ML) low buckled (LB) mercury telluride (HgTe) and…
Aviram-Ratner rectifying mechanism for DNA base pair sequencing through graphene nanogaps
Luis A. Agapito, Jacob Gayles, Christian Wolowiec +1
We demonstrate that biological molecules such as Watson-Crick DNA base pairs can behave as biological Aviram-Ratner electrical rectifiers because of the spatial separation and weak…
Approaching the Intrinsic Bandgap in Suspended High-Mobility Graphene Nanoribbons
Ming-Wei Lin, Cheng Ling, Luis A. Agapito +6
We report electrical transport measurements on a suspended ultra-low-disorder graphene nanoribbon(GNR) with nearly atomically smooth edges that reveal a high mobility exceeding 300…
Room-Temperature High On/Off Ratio in Suspended Graphene Nanoribbon Field Effect Transistors
Ming-Wei Lin, Cheng Ling, Yiyang Zhang +6
We have fabricated suspended few layer (1-3 layers) graphene nanoribbon field effect transistors from unzipped multiwall carbon nanotubes. Electrical transport measurements show th…
Enhancing the spin-transfer torque through proximity of quantum well states
Ioannis Theodonis, Alan Kalitsov, Nicholas Kioussis
We predict that the spin-transfer, , and field-like, , components of the {\it local} spin torque are dramatically enhanced in double-barrier magnetic tunnel j…