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Welcome to Wiki of the Quantum Transport Theory Group led by Prof. Dr. Branislav K. Nikolić

About QTTG Our theoretical condensed matter physics group is focused on nonequilibrium quantum and many-body systems, with close attention being paid to their realization in experiments and/or technological applications, such as: quantum transport in nanostructures, spintronics, magnonics, entanglement in solid-state materials or between qubits, ultrafast-light-driven quantum materials and their heterostructures. The principal tools that we employ daily include analytical Schwinger-Keldysh nonequilibrium quantum field theory, as well as computational nonequilibrium Green functions, time-dependent density functional theory, time-dependent density matrix renormalization group, quantum-classical methods and their combination with high performance scientific computing. Our research is supported by the U.S. National Science Foundation and the 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 Deciphering the origin of spin current in spintronic terahertz emitters and its imprint on their electromagnetic radiation via time-dependent density functional theory Reconciling Kubo and Keldysh approaches to Fermi-sea-dependent nonequilibrium observables: Application to spin Hall current and spin-orbit torque in spintronics Computational quantum transport Schwinger-Keldysh nonequilibrium quantum field theory of open quantum systems beyond the Markovian regime: Application to the spin-boson model Charge and spin current pumping by ultrafast demagnetization dynamics 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). QTTG Member Competences strong commitment, attention to detail, demonstrated ability to work with deadlines, manage conflicting priorities, excellent communication skills, ability to work with highly qualified professionals with international backgrounds.

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