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Welcome to Wiki of the Quantum Transport Theory Group Our group is a member of the Center for Spintronics and Biodetection

About QTTG Our group conducts research on the frontier problems of quantum transport of electron charge and spin in a variety of nanostructures. The Research Topics that we are currently pursuing include: second-generation spintronics, graphene-based nanoelectronics, nanoelectronic biosensors, nanoscale thermoelectric devices, strongly correlated heterostructures. We are also working on the development of new theoretical and computational formalisms, often involving massively parallel codes, which are required to study quantum many-body systems far from equilibrium. The principal tools that we employ daily include nonequilibrium Green function theory, density functional theory, and dynamical mean field theory. Our research is supported by the National Science Foundation and the U.S. Department of Energy. Research Highlights The image on the left depicts bilayer-CrI3/monolayer-TaSe2 van der Waals heterostructure for which we predict current-pulse driven nonequilibrium phase transition where spin-orbit torque, generated by monolayer of metallic transition metal dichalcogenide TaSe2, switches insulating antiferromagnet bilayer-CrI3 into ferromagnet in reversible fashion and with those phases being stable in between two pulses.

News Outreach Video on Spinning balls in baseball Video Lecture on Spin and charge pumping in the presence of spin-orbit coupling in THz spintronics with antiferromagnets at SPICE-SPIN+X seminars, Germany Video Lecture on Quantum-classical description of nonequilibrium electrons interacting with dynamical magnetic textures in spintronics and magnonics at W2S seminars, India. Video of Lecture on Spin-orbit torque in van der Waals heterostructures of magnetic two-dimensional materials at ICTP school on 2D Materials for Spin-Orbitronics. Video Lecture on What is quantum spin torque: Spintronics meets nonequilibrium strongly correlated and long-range entangled quantum matter at Real-space simulations of topological matter and disordered materials CMD 29 online series. Video Lecture on Diagrammatic and resummation algorithms for electron-magnon and electron-phonon interacting systems in nanojunctions far from equilibrium at nano-QT 2016 in Kiev. Recently Completed Projects Charge and spin current pumping by ultrafast demagnetization dynamics Magnon spectrum of altermagnets: Time-dependent matrix product states vs. linearized Holstein-Primakoff calculations unraveling spontaneous magnon decay Nonlocal damping of spin waves in a magnetic insulator induced by normal, heavy, or altermagnetic metallic overlayer: A Schwinger-Keldysh field theory approach Origins of electromagnetic radiation from spintronic terahertz emitters: A time-dependent density functional theory plus Jefimenko equations approach Twist- and gate-tunable proximity spin-orbit coupling, spin relaxation anisotropy, and charge-to-spin conversion in heterostructures of graphene and transition-metal dichalcogenides QTTG Mottos The outcome of any serious research can only be to make the two questions grow where only one grew before. Employing the computer for the study of a model has the feeling of an experiment: you can ask clever "questions" to the "sample" under study, analyze data, and come up with an intuitive picture of what is happening. Very often the computer results are not what we were expecting a priori, thus there is a neat back and forth process until a convergence to a firm conclusion is reached. (Elbio Dagotto).

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