Concordia University

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Vasilopoulos Research Group

Our current research can be broadly characterized as

Transport and many-body effects in nanostructures of Dirac materials.

We theoretically study (magneto)transport properties, e.g., spin-Hall effect, quantum Hall effect, optical absorption, etc., in novel graphene-like nanostructures, also known broadly as Dirac materials, and Floquet topological insulators. The combinations of different Dirac materials are known or referred to as van der Waals heterostructures. We also study thermal transport, and collective excitations, e.g., plasmons, surface plasmons, etc., in the same structures.

All studies focus on various ways to control transport in these materials and obtain results pertinent to the development of novel electronic, spintronic and valleytronic devices.

Some explicit research topics of the group are:

  1. Transport and many-body effects in transition-metal-dichalcogenides,
  2. Semimetal states and Coulomb screening in black phosphorus and Weyl materials and
  3. Atomic collapse in Dirac materials, influence on transport.
  1. Dai, Y., Wang, X.-F., Vasilopoulos, P. & Liu, Y.-S. Tunable spin-polarized transport through a side-gated double quantum dot molecular junction in the Coulomb blockade regime. Applied Nanoscience (2019). doi:10.1007/s13204-019-00981-y PDF
  2. Zubair, M., Tahir, M. & Vasilopoulos, P. Magneto-optical properties of bilayer transition metal dichalcogenides. Phys. Rev. B 98, 155402 (2018). doi:10.1103/PhysRevB.98.155402 PDF
  3. Tahir, M., Krstajić, P. M. & Vasilopoulos, P. Electrically controlled dc and ac transport in bilayer WSe2. Phys. Rev. B 98, 075429 (2018). doi:10.1103/PhysRevB.98.075429 PDF
  4. Mirzakhani, M., Zarenia, M., Vasilopoulos, P., Ketabi, S. A. & Peeters, F. M. Landau levels in biased graphene structures with monolayer-bilayer interfaces. Phys. Rev. B 96, 125430 (2017). doi:10.1103/PhysRevB.96.125430 PDF
  5. Tahir, M. & Vasilopoulos, P. Commensurability oscillations in a periodically modulated phosphorene. Journal of Physics: Condensed Matter 29, 425302 (2017). doi:10.1088/1361-648x/aa8428 PDF
  6. Bahrami, M. & Vasilopoulos, P. Exchange, correlation, and scattering effects on surface plasmons in arm-chair graphene nanoribbons. Opt. Express 25, 16840–16853 (2017). doi:10.1364/OE.25.016840 PDF
  7. Zubair, M., Tahir, M., Vasilopoulos, P. & Sabeeh, K. Quantum magnetotransport in bilayer MoS2: Influence of perpendicular electric field. Phys. Rev. B 96, 045405 (2017). doi:10.1103/PhysRevB.96.045405 PDF
  8. Van Pottelberge, R., Zarenia, M., Vasilopoulos, P. & Peeters, F. M. Graphene quantum dot with a Coulomb impurity: Subcritical and supercritical regime. Phys. Rev. B 95, 245410 (2017). doi:10.1103/PhysRevB.95.245410 PDF
  9. Tahir, M., Krstajić, P. M. & Vasilopoulos, P. Magnetic and electric control of spin- and valley-polarized transport across tunnel junctions on monolayer WSe2. Phys. Rev. B 95, 235402 (2017). doi:10.1103/PhysRevB.95.235402 PDF
  10. Li, L. L., Moldovan, D., Vasilopoulos, P. & Peeters, F. M. Aharonov-Bohm oscillations in phosphorene quantum rings. Phys. Rev. B 95, 205426 (2017). doi:10.1103/PhysRevB.95.205426 PDF
  11. Mirzakhani, M., Zarenia, M., Vasilopoulos, P. & Peeters, F. M. Electrostatically confined trilayer graphene quantum dots. Phys. Rev. B 95, 155434 (2017). doi:10.1103/PhysRevB.95.155434 PDF
  12. Tahir, M., Krstajić, P. M. & Vasilopoulos, P. Zeeman- and electric-field control of spin- and valley-polarized transport through biased magnetic junctions on WSe2. EPL (Europhysics Letters) 118, 17001 (2017). doi:10.1209/0295-5075/118/17001 PDF
  13. Krstajić, P. M., Vasilopoulos, P. & Tahir, M. Spin- and valley-polarized transport in a monolayer of MoS2. Phys. Rev. B 94, 085413 (2016). doi:10.1103/PhysRevB.94.085413 PDF
  14. Tahir, M., Vasilopoulos, P. & Schwingenschlögl, U. Unconventional quantum Hall effect in Floquet topological insulators. Journal of Physics: Condensed Matter 28, 385302 (2016). doi:10.1088/0953-8984/28/38/385302 PDF
  15. Tahir, M. & Vasilopoulos, P. Magneto-optical transport properties of monolayer WSe2. Phys. Rev. B 94, 045415 (2016). doi:10.1103/PhysRevB.94.045415 PDF
  16. Missault, N., Vasilopoulos, P., Peeters, F. M. & Van Duppen, B. Spin- and valley-dependent miniband structure and transport in silicene superlattices. Phys. Rev. B 93, 125425 (2016). doi:10.1103/PhysRevB.93.125425 PDF
  17. Tahir, M., Vasilopoulos, P. & Peeters, F. M. Quantum magnetotransport properties of a MoS2 monolayer. Phys. Rev. B 93, 035406 (2016). doi:10.1103/PhysRevB.93.035406 PDF
  18. Krstajić, P. M., Vasilopoulos, P. & Tahir, M. Spin- and valley-polarized transport through ferromagnetic and antiferromagnetic barriers on monolayer MoS2. Physica E: Low-dimensional Systems and Nanostructures 75, 317–321 (2016). doi:10.1016/j.physe.2015.10.003 PDF
  19. Missault, N., Vasilopoulos, P., Vargiamidis, V., Peeters, F. M. & Van Duppen, B. Spin- and valley-dependent transport through arrays of ferromagnetic silicene junctions. Phys. Rev. B 92, 195423 (2015). doi:10.1103/PhysRevB.92.195423 PDF
  20. Tahir, M., Vasilopoulos, P. & Peeters, F. M. Magneto-optical transport properties of monolayer phosphorene. Phys. Rev. B 92, 045420 (2015). doi:10.1103/PhysRevB.92.045420 PDF
  21. Tahir, M. & Vasilopoulos, P. Off-resonant polarized light-controlled thermoelectric transport in ultrathin topological insulators. Phys. Rev. B 91, 115311 (2015). doi:10.1103/PhysRevB.91.115311 PDF
  22. Vargiamidis, V. & Vasilopoulos, P. Polarized spin and valley transport across ferromagnetic silicene junctions. Journal of Applied Physics 117, 094305 (2015). doi:10.1063/1.4913934 PDF
  23. Tahir, M. & Vasilopoulos, P. Electrically tunable magnetoplasmons in a monolayer of silicene or germanene. Journal of Physics: Condensed Matter 27, 075303 (2015). doi:10.1088/0953-8984/27/7/075303 PDF
  24. Shakouri, Kh., Vasilopoulos, P., Vargiamidis, V. & Peeters, F. M. Integer and half-integer quantum Hall effect in silicene: Influence of an external electric field and impurities. Phys. Rev. B 90, 235423 (2014). doi:10.1103/PhysRevB.90.235423 PDF
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