• Sergey Artyukhin3 © 2016 IIT 4954
  • Sergey Artyukhin2 © 2016 IIT 4953

Our interests are in realistic modeling of quantum effects in magnetic, ferroelectric, multiferroic and other functional materials.

We study Hamiltonians models analytically, using Monte-Carlo and exact diagonalization, and perform numerical simulations (dft, dmft, md) to study magnetic, electronic, optical properties of materials, mostly oxides and dichalcogenides. We closely collaborate with experimental groups to interpret their data and possibly guide the measurements.

Activities

  • Multiferroics: novel magnetoelectric coupling mechanisms, excitations and switching dynamics

The use of ordered (ferroic) materials spans every area of modern technology. Magnetic materials are used for information storage, piezoelectrics are used in sensors and actuators, superconductors are needed to support maglev trains and perform MRI. Materials with multiple ferroic orders - multiferroics - combine functionalities of conventional ferroics and promise to break the ground for new devices and functionalities. For example, they could offer electric control of magnetic bits, much sought after due to difficulties with applying magnetic fields in miniature devices and the associated dissipation. We study the complex interactions between bulk orders and between domain walls, and resulting excitations and dynamics.

  •  Ultrafast dynamics of phase transitions (in collaboration with MPI-Hamburg and UCSD)

Recent experiments allowed to track the dynamics of matter on ultrafast timescales, where many important phenomena are taking place. In collaboration with experimental groups, we study rapid phase changes following an intense laser pulse. This work reveals the details of the switching mechanisms in materials with complex orders.

  • Materials with strong spin-orbit coupling and hidden orders

Electric fields inside materials result in a magnetic field in a co-moving frame of electrons, thus giving rise to the interaction between the orbital and spin degrees of freedom (spin-orbit coupling). These interactions are especially strong in heavy ions due to a large charge of their nuclei. Strong spin-orbit coupling leads to exotic states, such as topologically protected surface states in topological insulators, and to high-multipole orders that are puzzling physicists for many years.

Laboratories

We have computational resources in IIT and in CINECA supercomputing center to perform simulations on real materials.

Collaborations

  • Rutgers University, USA
  • Max Planck Institute for Structure and Dynamics of Matter (Hamburg, Germany)
  • University of Groningen, The Netherlands
  • University of Texas at Austin, USA
  • University of California at San Diego, USA