Teemu Ojanen

Researcher

Department of applied physics (Low Temperature Laboratory)

Aalto University, Finland 

 

 

Email: teemuo@boojum.hut.fi 

 

I did my phd in the nanotheory group in Low Temperature Laboratory in Helsinki University of Technology.  I worked as a postdoc at Freie Universität Berlin in the group of Prof. Felix von Oppen ( 2008-2010). Between fall 2011-fall 2012 I was visiting the  Condensed Matter Theory group at Harvard University. Currently I am an Academy Research Fellow funded by the Academy of Finland and lead the group Theory of Quantum Matter concentrating on topological matter.

 

Resume

cv.pdf

Research interests

-Quantum condensed-matter physics

-Topological matter

-Mesoscopic systems and quantum transport

Current members of my group

Alex Westström (Ph.d student)

Kim Pöyhönen (Ph.d student)

Isac Sahlberg (M.Sc student)

Publications

Alex Westström and Teemu Ojanen, Designer curved space geometry for relativistic fermions in Weyl metamaterials, arXiv:1703.10408.

Shawulienu Kezilebieke, Marc Dvorak Teemu Ojanen, Peter Liljeroth, Coupled Yu-Shiba-Rusinov states in molecular dimers on NbSe2 , arXiv:1701.03288.

Isac Sahlberg, Alex Westström, Kim Pöyhönen and Teemu Ojanen, Engineering 1D topological phases on p-wave superconductors Phys. Rev. B 95, 184512 (2017).

Robert Drost, Teemu Ojanen, Ari Harju, Peter Liljeroth, Topological states in engineered lattices, doi:10.1038/nphys4080, Nature Physics (2017).

Kim Pöyhönen, Alex Westström, Sergey S. Pershoguba, Teemu Ojanen and Alexander V. Balatsky, Skyrmion-induced subgap states in p-wave superconductors, Phys. Rev. B 94, 214509 (2016).

Vardan Kaladhzyan, Joel Röntynen, Pascal Simon and Teemu Ojanen, Topological state engineering by potential impurities on chiral superconductors, Phys. Rev. B 94, 060505 (2016).

Alex Westström, Kim Pöyhönen and Teemu Ojanen, Topological superconductivity and anti-Shiba states in disordered chains of magnetic adatoms, Phys. Rev. B 94, 104519 (2016).

Teemu Ojanen, Ground state angular momentum, spectral asymmetry and topology in chiral superfluids and superconductors, Phys. Rev. B 93, 174505 (2016).

Joel Röntynen and Teemu Ojanen, Chern mosaic – topology of chiral superconductivity on ferromagnetic adatom lattices, Phys. Rev. B 93, 094521 (2016).

K. Pöyhönen, A. Westström, and T. Ojanen, Topological superconductivity in ferromagnetic atom chains beyond the deep-impurity regime, Phys. Rev. B 93, 014517 (2016).

Jan Behrends, Adolfo G. Grushin, Teemu Ojanen, and Jens H. Bardarson, Visualizing the chiral anomaly in Dirac and Weyl semimetals using photoemission spectroscopy, Phys. Rev. B 93, 075114 (2016).

Joel Röntynen and Teemu Ojanen, Topological superconductivity and high Chern numbers in 2D ferromagnetic Shiba lattices, Phys. Rev. Lett. 114, 236803 (2015).

Alex Westström, Kim Pöyhönen and Teemu Ojanen, Topological properties of helical Shiba chains with general impurity strength and hybridization, Phys. Rev. B 91, 064502 (2015).

Joel Röntynen and Teemu Ojanen, Tuning topological superconductivity in helical Shiba chains by supercurrent, Phys. Rev. B 90, 180503 (2014).

Teemu Ojanen and Kjetil Börkje, Ground state cooling of mechanical motion in the unresolved sideband regime by use of optomechanically induced transparency, Phys. Rev. A 90 013824 (2014) Editors suggestion.

Kim Pöyhönen, Alex Westsröm, Joel Röntynen and Teemu Ojanen, Majorana states in Shiba chains and ladders, Phys. Rev. B 89, 115109 (2014).

Teemu Ojanen, Majorana states and devices in magnetic structures, Phys. Rev. B 88, 220502 (2013).

 Teemu Ojanen, Helical Fermi arcs and surface states in time-reversal invariant Weyl semimetals, PRB 87, 245112 (2013).

Teemu Ojanen, Topological pi Josephson junction in superconducting Rashba wires, PRB 87, 100506 (2013).

 Teemu Ojanen, Magnetoelectric effects in superconducting nanowires with Rashba spin-orbit coupling, PRL 109, 226804 (2012).

 Teemu Ojanen and Takuya Kitagawa, Anomalous electromagnetic response of superconducting Rashba systems in trivial and topological phases, PRB 87, 014512 (2013).

 Tomi Ruokola and Teemu Ojanen, Theory of single-electron heat engines coupled to electromagnetic environments, PRB 86, 035454 (2012).

 Teemu Ojanen and Takuya Kitagawa, Photoinduced helical metal and magnetization in two-dimensional systems with spin-orbit interaction, PRB 85, 161202(R) (2012)

 Jukka I Väyrynen and Teemu Ojanen, Chiral topological phases and fractional domain wall excitations in one dimensional chains and wires, PRL 107, 166804 (2011).

 Tomi Ruokola and Teemu Ojanen, Single-electron heat diode, PRB 83,241404(R) (2011).

 Jukka I. Väyrynen and Teemu Ojanen, Electrical manipulation and measurement of spin properties of quantum spin Hall edge states, PRL 106, 076803 (2011).

 Tomi Ruokola and Teemu Ojanen, Thermal conductance in spin-boson model- cotunneling and low temperature properties, PRB 83, 045417 (2011).

 E. Ginossar, L. Glazman, T. Ojanen, F. von Oppen, W. E. Shanks, A. C. Bleszynski-Jayich and J. G. E. Harris, Mesoscopic persistent currents in a strong magnetic field PRB  81, 155448 (2010) (Editor’s suggestion).

 Teemu Ojanen, Selection-rule blockade and rectification in quantum heat transport PRB 80, 180301 (2009).

 Teemu Ojanen, Friedrich C. Gethmann and Felix von Oppen, Electromechanical instability in vibrating quantum dots with effectively negative charging energy , PRB 80, 195103 (2009).

 Tomi Ruokola, Teemu Ojanen and Antti-Pekka Jauho, Thermal rectification in nonlinear quantum circuits, PRB 79, 144306 (2009).

 M. A. Laakso, T. Ojanen and T. T. Heikkilä, Effective capacitance in a single-electron transistor, PRB 77, 233303 (2008).

 Teemu Ojanen and Antti-Pekka Jauho, Mesoscopic photon heat transistor,  PRL 100, 155902 (2008).

 T. Ojanen, A. O. Niskanen, Y. Nakamura, A. A. Abdumalikov Jr, Global relaxation in superconducting qubits, PRB 76, 100505(R) (2007) .

 Teemu Ojanen and Tero T. Heikkilä, Photon heat transport in low-dimensional nanostructures, PRB 76, 073414 (2007).

 Teemu Ojanen and Janne Salo, On-chip element for squeezed microwave generation, PRB 75, 184508 (2007).

 Tero T. Heikkilä and Teemu Ojanen, Quantum detectors for the third cumulant of current fluctuations, PRB 75, 035335 (2007).

 O-P Saira, V. Bergholm, T. Ojanen and M. Möttönen, Equivalent qubit dynamics under classical and quantum noise, PRA 75, 012308 (2007) .

 Teemu Ojanen and Tero T. Heikkilä, Quantum transition induced by the third cumulant of current fluctuations,  PRB 73, 020501(R) (2006).

 T. Ojanen and T. T. Heikkilä, State-dependent impedance of a strongly-coupled oscillator-qubit system, PRB 72, 054502 (2005).

Supevised theses

Joel Röntynen, Topological superconductivity in magnetic adatom lattices, Phd Thesis (2016).

Tomi Ruokola, Thermal transport in mesoscopic devices Phd Thesis (2012).

Jukka Väyrynen, The gradient expansion and topological insulators, Master's Thesis (2011).

Alex Westström, Majorana states at magnetic domain walls, Bachelor's Thesis (2013).

Kim Pöyhönen, Topological properties of superconducting chains, Bachelor's Thesis (2013).

Jaakko Hujanen, Inverse Problem for Quantum Mechanical Scattering in One Dimension, Master's Thesis (2014), (co-supervised with Nuutti Hyvönen).

Alex Westström, Topological properties of Helical Shiba Chains, Master's Thesis (2015).

Kim Pöyhönen, Majorana states in ferromagnetic chains, Master's Thesis (2015).

 Hobbies&related interests

-Sports: floorball, badminton, football…

-Beer :-)

-Books, especially scifi and fantasy, comic books&graphic novels

-History of physics and mathematics