Mayra PeraltaYachay Tech · Department of Physics
Mayra Peralta
Ph.D. in Physics
About
18
Publications
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Introduction
My research is focused on transport properties of low-D materials, like graphene, silicene, phosphorene, TMD's, and chiral molecules, among others. In particular I am interested in the description of properties like spin orders, spin orbit splitting, spin transport, and charge transport, in terms of the microscopic characteristics of the systems like the structure, the atomic orbitals and their overlaps. With this end I use analytical techniques like tight binding and k.p theory.
Additional affiliations
October 2016 - October 2017
Publications
Publications (18)
In this research, we explore sequence-dependent chiral-induced spin selectivity (CISS) in double-stranded (ds)-DNA using time-correlated single-photon counting and electrochemical impedance spectroscopy supplemented by tight-binding calculations of the phenomenon for the first time. The average lifetime of the photo-excited electrons in a Quantum D...
We address the electron-spin-phonon coupling in an effective model Hamiltonian for DNA to assess its role in spin transfer involved in the Chiral-Induced Spin Selectivity (CISS) effect. The envelope function approach is used to describe semiclassical electron transfer in a tight-binding model of DNA at half filling in the presence of intrinsic spin...
Basic questions on the nature of spin polarization in two terminal systems and the way in which decoherence breaks Time-Reversal Symmetry (TRS) are analyzed. We exactly solve several one-dimensional models of tunneling electrons and show the interplay of spin precession and decay of the wavefunction in either a U(1) U ( 1 ) magnetic field or an eff...
Basic questions on the nature of spin polarization in two terminal systems and the way in which decoherence breaks Time-Reversal Symmetry (TRS) are analyzed. We exactly solve several one-dimensional models of tunneling electrons and show the interplay of spin precession and decay of the wavefunction in either a U(1) magnetic field or an effective S...
The electronic states of a mesoscopic ring are assessed using the Green functions approach and the equation of motion method. We put forward the Green’s function formalism to evaluate precisely persistent charge and spin currents in a ring exhibiting nearest-neighbors (NN) and next-nearest (NNN) neighbors Rashba spin–orbit interactions. Our present...
In this work, we propose the analysis of the electronic and transport properties of graphene decorated with Lithium and Potassium adatoms. We will study two inequivalent metal adsorption sites: the Top site, on top of a carbon atom of one sub-lattice of graphene; and the Hollow site, in the middle of a C6-unit. With this end, we will use an analyti...
We analyze the influence of electron-phonon (e-ph) interaction in a model for electron transfer (ET) processes in DNA in terms of the envelope function approach for spinless electrons. We are specifically concerned with the effect of e-ph interaction on the coherence of the ET process, and how to model the interaction of DNA with phonon reservoirs...
We introduce a $p_{z}-d$ coupling model Hamiltonian for the $\pi$-graphene/Au bands that predicts a rather large intrinsic spin-orbit (SO) coupling as are being reported in recent experiments and DFT studies. Working within the analytical Slater-Koster tight-binding approach we were able to identify the overlapping orbitals of relevance in the enha...
The proximity-induced effects of the nearly commensurate lattice structure of a graphene layer AC stacked on Ni(111) and Co(0001) substrates are addressed. To this end, a minimal tight-binding Hamiltonian is constructed within the Slater-Koster method. We consider the hybridizations of the magnetic 3d orbitals of Ni (Co) atoms with the pz orbitals...
The induced-proximity effects of nearly commensurate lattice structure of a graphene layer on Ni(111) and Co(0001) substrates in the AC stacking configuration are addressed through an analytical tight-binding approach within the Slater-Koster method. A minimal Hamiltonian is constructed by considering the hybridizations of the magnetic $3d$-orbital...
We introduce a pz−d coupling model Hamiltonian for the π-graphene/Au bands that predicts a rather large intrinsic spin-orbit (SO) coupling as is being reported in recent experiments and DFT studies. Working within the analytical Slater-Koster tight-binding approach we were able to identify the overlapping orbitals of relevance in the enhancement of...
We build a tight-binding Hamiltonian describing Co/Ni over graphene, contemplating ATOP (a Co/Ni atom on top of each Carbon atom of one graphene sublattice) and HCP (one Co/Ni atom per Graphene plaquette) configurations. For the ATOP configuration the orbitals involved, for the Co/Ni, are the d z 2 −r 2 which most strongly couples to one graphene s...
Hollow nanostructured spheres of Co, Zn, Mn and Ni ferrites were synthesized from metallic impregnation in situ during the formation of colloidal carbon microspheres from hydrothermal treatment of a glucose solution at 160 °C for 24h and then calcinated in air at 550 °C for 2h. The X-ray diffraction powder patterns reveal the formation of spinel-li...
The fabrication of relatively small electromagnetic generators has been reported recently in the
literature by a number of research groups. Their characteristic sizes are of the order of one millimeter.
With proper tune up, these devices have been used to convert waste ambient vibration
noise into useful electric power. We would like to analyze, in...