Research: Quantum dynamics

Schematic picture of a ring of 4 spins connected to a ring-shaped bath of 18 spins

Our approach to study the dynamical properties of a quantum system is to solve numerically, and without additional approximations, the time-dependent Schrödinger equation for the model Hamiltonian.
We are currently working on

  • The simulation of electron-spin-resonance (ESR) and nuclear magnetic resonance (NMR) experiments on nanoscale magnets
  • Transport properties of graphene
  • Quantum dynamics of molecular magnets and diluted magnets
  • Quantum annealing
  • The simulation of physical realizations of quantum computer hardware
  • Fundamental questions of the foundations of statistical physics mainly such as the question how a system of interacting particles dynamically evolves to a stationary state (e.g. thermal equilibrium)
Selected publications:
  • M.A. Novotny, M. Guerra, H. De Raedt, K. Michielsen, and F. Jin,
    "Dynamics of a Single Spin 1/2 Coupled to x- and y-Spin Baths: Algorithm and Results",
    Physics Procedia 34, 90 – 99 (2012)
  • H. De Raedt, B. Barbara, S. Miyashita, K. Michielsen, S. Bertaina, and S. Gambarelli,
    "Quantum simulations and experiments on Rabi oscillations of spin qubits: Intrinsic vs extrinsic damping",
    Phys. Rev. B 85, 014408 (2012)
  • S. Yuan, R. Roldán, H. De Raedt, and M.I. Katsnelson,
    "Optical conductivity of disordered graphene beyond the Dirac cone approximation",
    Phys. Rev. B 84, 195418 (2011)
  • S. Yuan, H. De Raedt, M.I. Katsnelson,
    "Electronic Transport in Disordered Bilayer and Trilayer Graphene",
    Phys. Rev. B 82, 235409 (2010)
  • F. Jin, H. De Raedt, S. Yuan, M.I. Katsnelson, S. Miyashita, and K. Michielsen,
    "Approach to equilbrium in nano-scale systems at finite temperature"
    J. Phys. Soc. Jpn. 79, 124005 (2010)
  • S. Yuan, M.I. Katsnelson, and H. De Raedt
    "Origin of the Canonical Ensemble: Thermalization with Decoherence",
    J. Phys. Soc. Jpn. 78, 094003 (2009)
  • S. Yuan, M.I. Katsnelson, and H. De Raedt,
    "Evolution of a quantum spin system to its ground state: Role of entanglement and interaction symmetry",
    Phys. Rev. A 75, 052109 (2007)
  • V.V. Dobrovitski, H.A. De Raedt, M.I. Katsnelson, and B.N. Harmon,
    "Quantum oscillations without quantum coherence",
    Phys. Rev. Lett. 90, 210401 (2003)
  • H. De Raedt, S. Miyashita, K. Saito, D. García-Pablos, and N. García,
    "Theory of Quantum Tunneling of the Magnetization in Magnetic Particles",
    Phys. Rev. B 56, 11761 - 11768 (1997)
  • Magnetization dynamics of nano-scale magnets