In this theory project, we want to accomplish two major tasks: Firstly, quantum dynamics and kinetics methods will be worked out to calculate the strongly driven charge and spin dynamics in ultrafast time-resolved scanning tunneling spectroscopy experiments, tunnel junctions, and photoemission experiments. These calculations will also deliver microscopic information as input for coarse-grained models.

Secondly, schemes are to be developed and implemented for large-scale electromagnetic/micromagnetic simulations to infer the dynamical, highly intense local field distributions for given magnetic nano- and heterostructures such as spintronic THz sources. Our approach also captures the strongly non-linear influence on the local magnetic dynamics, including the transient changes in the underlying microscopic magnetic interactions, as well as the modifications of the traversing electromagnetic waves such as strong changes in their frequency, phase, or polarization. The results are expected to contribute to a deeper understanding of the dynamic interplay between spin, charge, and intense radiation fields with prospect applications in ultrafast magnetophotonics.

Publications

• Electrons in intense laser fields with local phase, polarization, and skyrmionic textures
  J. Wätzel and J. Berakdar 
  Phys. Rev. A 102, 063105 (2020)  - DOI: 10.1103/PhysRevA.102.063105

• Rotating edge‑field driven processing of chiral spin textures in racetrack devices 
  A. F. Schäffer, P. Siegl, M. Stier, T. Posske, J. Berakdar, M. Thorwart, R. Wiesendanger, and E. Y. Vedmedenko 
  Sci. Rep. 10: 20400 (2020)  - DOI: 10.1038/s41598-020-77337-y

• Highly tunable spin-orbit torque and anisotropic magnetoresistance in a topological insulator thin film attached to ferromagnetic layer 
  A. G. Moghaddam, A. Qaiumzadeh, A. Dyrdał, and J. Berakdar 
  Phys. Rev. Lett. 125, 196801 (2020)  - DOI: 10.1103/PhysRevLett.125.196801

• Imprinting photon orbital angular momentum during laser-assisted photoemission from quantum wells 
  J. Wätzel, A. Blättermann, D. Schulz, C.-T. Chiang, and J. Berakdar 
  Opt. Lett. 45, 5970 (2020)  - DOI: 10.1364/OL.409206

• Photoelectric effect with a twist 
  G. De Ninno, J. Wätzel, P. R. Ribič, E. Allaria, M. Coreno, M. B. Danailov, C. David, A. Demidovich, M. Di Fraia, L. Giannessi, K. Hansen, Š. Krušič, M. Manfredda, M. Meyer, A. Mihelič, N. Mirian, O. Plekan, B. Ressel, B. Rösner, A. Simoncig, S. Spampinati, M. Stupar, M. Žitnik, M. Zangrando, C. Callegari, and J. Berakdar 
  Nat. Photonics 14, 554 (2020)  - DOI: 10.1038/s41566-020-0669-y

• Nondestructive ultrafast steering of a magnetic vortex by terahertz pulses 
  D. Yu, J. Kang, J. Berakdar, and C. L. Jia 
  NPG Asia Mater. 12: 36 (2020)  - DOI: 10.1038/s41427-020-0217-8

• Topological light fields for highly non-linear charge quantum dynamics and high harmonic generation 
  J. Wätzel and J. Berakdar 
  Opt. Express 28, 19469 (2020)  - DOI: 10.1364/OE.395590

• Stratonovich-Ito integration scheme in ultrafast spin caloritronics 
  L. Chotorlishvili, Z. Toklikishvili, X.-G. Wang, V. K. Dugaev, J. Barnaś, and J. Berakdar 
  Phys. Rev. B 102, 024413 (2020)  - DOI: 10.1103/PhysRevB.102.024413

• Twisting and tweezing the spin wave: on vortices, skyrmions, helical waves, and the magnonic spiral phase plate
  C. Jia, D. Ma, A. F. Schäffer, and J. Berakdar
  J. Opt. 21, 124001 (2019)  - DOI: 10.1088/2040-8986/ab4f8e

• Twisted magnon beams carrying orbital angular momentum
  C. Jia, D. Ma, A. F. Schäffer, and J. Berakdar
  Nat. Commun. 10:2077 (2019) - DOI: 10.1038/s41467-019-10008-3

• Electrical writing, deleting, reading, and moving of magnetic skyrmioniums in a racetrack device
  B. Göbel, A. F. Schäffer, J. Berakdar, I. Mertig, and S. S. P. Parkin
  Sci. Rep. 9, 12119 (2019)  - DOI: 10.1038/s41598-019-48617-z

• Time-resolved buildup of twisted indirect exchange interaction in two-dimensional systems 
  V. A. Stephanovich, E. V. Kirichenko, V. K. Dugaev, J. Barnaś, and J. Berakdar 
  Phys. Rev. B 99, 235302 (2019)  - DOI: 10.1103/PhysRevB.99.235302

• Influence of spin-orbit and spin-Hall effects on the spin-Seebeck current beyond linear response: A Fokker-Planck approach
  L. Chotorlishvili, Z. Toklikishvili, X.-G. Wang, V. K. Dugaev, J. Barnaś, and J. Berakdar
  Phys. Rev. B 99, 024410 (2019)  - DOI: 10.1103/PhysRevB.99.024410

• Thermoelastic enhancement of the magnonic spin Seebeck effect in thin films and bulk samples
  L. Chotorlishvili, X.-G. Wang, Z. Toklikishvili, and J. Berakdar 
  Phys. Rev. B 97, 144409 (2018)  - DOI: 10.1103/PhysRevB.97.144409

• Thermally induced spin polarization in a magnetized two-dimensional electron gas with Rashba spin-orbit interaction
  A. Dyrdał, J. Barnaś, V. K. Dugaev, and J. Berakdar
  Phys. Rev. B 98, 075307 (2018)  - DOI: 10.1103/PhysRevB.98.075307

• Magnetophononics: Ultrafast spin control through the lattice
  M. Fechner, A. Sukhov, L. Chotorlishvili, C. Kenel, J. Berakdar, and N. A. Spaldin
  Phys. Rev. Materials 2, 064401 (2018)  - DOI: 10.1103/PhysRevMaterials.2.064401

• Charge and spin currents in graphene generated by tailored light with orbital angular momentum
  M. Inglot, V. K. Dugaev, J. Berakdar, E. Y. Sherman, and J. Barnaś
  Appl. Phys. Lett. 112, 231102 (2018)  - DOI: 10.1063/1.5027667

• Radiation characteristics of nanoscopic structures driven by perfect optical vortex pulse
  M. Kraus, J. Wätzel, and J. Berakdar
  Opt. Commun. 427, 390 (2018)  - DOI: 10.1016/j.optcom.2018.06.083

• Anomalous Hall and Nernst effects in 2D systems: Role of cubic Rashba spin–orbit coupling
  A. Krzyżewska, A. Dyrdał, J. Barnaś, and J. Berakdar
  phys. stat. sol. (RRL) 12, 1800232 (2018)  - DOI: 10.1002/pssr.201800232

• Spin active split-ring resonator for THz high harmonic generation
  D. Schulze, J. Wätzel, and J. Berakdar
  Eur. Phys. J. B 91, 106 (2018)  - DOI: 10.1140/epjb/e2018-90142-5

• All-optical generation and ultrafast tuning of non-linear spin Hall current
  J. Wätzel and J. Berakdar
  Sci. Rep. 8:17102 (2018)  - DOI: 10.1038/s41598-018-35378-4

• Magnetoelectric response of quantum structures driven by optical vector beams
  J. Wätzel, C. M. Granados-Castro, and J. Berakdar
  Phys. Rev. B 99, 085425 (2019)  - DOI: 10.1103/PhysRevB.99.085425

• Electric field controlled spin waveguide phase shifter in YIG
  X.-G. Wang, L. Chotorlishvili, G.-H. Guo, and J. Berakdar 
  J. Appl. Phys. 124, 073903 (2018)  - DOI: 10.1063/1.5037958