Tomáš Bzdušek
@tomasbzdusek.bsky.social
Math and science enthusiast who likes to spend time in the mountains. Origami fan. Professor for Theory of Topological Matter at the University of Zurich.
From quantum geometry to non-linear optics, venturing along the way to multigap topology, shift currents, and gerbes.
I was invited to write a Scientific Perspective article for the newsletter of the Swiss MaNEP network, which just went online:
manep.ch/news/discove...
I was invited to write a Scientific Perspective article for the newsletter of the Swiss MaNEP network, which just went online:
manep.ch/news/discove...
From quantum geometry to non-linear optics: recent advances in topological band theory
By Tomáš Bzdušek, University of Zurich Topological principles constitute at present an integral component of condensed matter physics, deeply influencing the modern characterization of electronic…
manep.ch
October 10, 2025 at 10:43 AM
From quantum geometry to non-linear optics, venturing along the way to multigap topology, shift currents, and gerbes.
I was invited to write a Scientific Perspective article for the newsletter of the Swiss MaNEP network, which just went online:
manep.ch/news/discove...
I was invited to write a Scientific Perspective article for the newsletter of the Swiss MaNEP network, which just went online:
manep.ch/news/discove...
The scheme described below even enables simulation of spinful topological bands of spin-orbit-coupled systems in metamaterial platforms involving only real hopping amplitudes.
Read more at:
arxiv.org/abs/2509.25316
Read more at:
arxiv.org/abs/2509.25316
October 7, 2025 at 8:08 AM
The scheme described below even enables simulation of spinful topological bands of spin-orbit-coupled systems in metamaterial platforms involving only real hopping amplitudes.
Read more at:
arxiv.org/abs/2509.25316
Read more at:
arxiv.org/abs/2509.25316
Learned so much about tensor monopoles and Chern-Euler duality -- many thanks for the discussions together!
Great experience hosting Wojciech Jankowski from Cambridge UK and Kang Yang from the Free University of Berlin. Both treated us with exciting talks within the scope of topological band theory!
September 17, 2025 at 5:16 PM
Learned so much about tensor monopoles and Chern-Euler duality -- many thanks for the discussions together!
Bought some more origami books and papers. Yay!
September 13, 2025 at 4:28 PM
Bought some more origami books and papers. Yay!
Reposted by Tomáš Bzdušek
New preprint on arXiv:
First part of our treatment of s-wave superconductivity in hyperbolic spaces, here covering Cayley-tree approximations, exact diagonalization, and Ginzburg-Landau description. More to follow!
arxiv.org/abs/2509.09330
First part of our treatment of s-wave superconductivity in hyperbolic spaces, here covering Cayley-tree approximations, exact diagonalization, and Ginzburg-Landau description. More to follow!
arxiv.org/abs/2509.09330
September 12, 2025 at 1:52 PM
New preprint on arXiv:
First part of our treatment of s-wave superconductivity in hyperbolic spaces, here covering Cayley-tree approximations, exact diagonalization, and Ginzburg-Landau description. More to follow!
arxiv.org/abs/2509.09330
First part of our treatment of s-wave superconductivity in hyperbolic spaces, here covering Cayley-tree approximations, exact diagonalization, and Ginzburg-Landau description. More to follow!
arxiv.org/abs/2509.09330
One easier fold: elephant, designed by Tetsuya Gotani. Folded from 35cm satogami paper.
September 11, 2025 at 6:16 AM
One easier fold: elephant, designed by Tetsuya Gotani. Folded from 35cm satogami paper.
Patrick's latest Wolfram post, on our Hyperbolic Spin Liquids PRL work, can be checked here:
community.wolfram.com/groups/-/m/t...
community.wolfram.com/groups/-/m/t...
September 9, 2025 at 6:48 AM
Patrick's latest Wolfram post, on our Hyperbolic Spin Liquids PRL work, can be checked here:
community.wolfram.com/groups/-/m/t...
community.wolfram.com/groups/-/m/t...
This origami piece involves the "Miura ori" pattern, also considered in the context of spacecraft engineering!
Jun Maekawa's peacock, which includes a collapsible tail. Here folded from a 30cm shadow Thai paper.
Jun Maekawa's peacock, which includes a collapsible tail. Here folded from a 30cm shadow Thai paper.
September 8, 2025 at 5:53 PM
This origami piece involves the "Miura ori" pattern, also considered in the context of spacecraft engineering!
Jun Maekawa's peacock, which includes a collapsible tail. Here folded from a 30cm shadow Thai paper.
Jun Maekawa's peacock, which includes a collapsible tail. Here folded from a 30cm shadow Thai paper.
More origami dinosaurs!
My second attempt at the Styracosaurus model designed by Tetsuya Gotani -- this time folded from a smaller 30cm shadow Thai paper.
My second attempt at the Styracosaurus model designed by Tetsuya Gotani -- this time folded from a smaller 30cm shadow Thai paper.
September 7, 2025 at 11:00 AM
More origami dinosaurs!
My second attempt at the Styracosaurus model designed by Tetsuya Gotani -- this time folded from a smaller 30cm shadow Thai paper.
My second attempt at the Styracosaurus model designed by Tetsuya Gotani -- this time folded from a smaller 30cm shadow Thai paper.
Origami going spiky!
My latest creation: Ankylosaurus, designed by Tetsuya Gotani. Folded from 35cm satogami paper.
My latest creation: Ankylosaurus, designed by Tetsuya Gotani. Folded from 35cm satogami paper.
September 6, 2025 at 6:28 PM
Origami going spiky!
My latest creation: Ankylosaurus, designed by Tetsuya Gotani. Folded from 35cm satogami paper.
My latest creation: Ankylosaurus, designed by Tetsuya Gotani. Folded from 35cm satogami paper.
Great experience hosting @ancurlija.bsky.social, who gave a beautiful Zurich Physics Colloquium on "Landau Level spectroscopy & topological materials" at ETH Zurich!
Here we are already enjoying the magnificent panoramic view at Die Waid after the event; in the company of Markus, Fabian, and Juraj.
Here we are already enjoying the magnificent panoramic view at Die Waid after the event; in the company of Markus, Fabian, and Juraj.
May 5, 2025 at 3:27 PM
Great experience hosting @ancurlija.bsky.social, who gave a beautiful Zurich Physics Colloquium on "Landau Level spectroscopy & topological materials" at ETH Zurich!
Here we are already enjoying the magnificent panoramic view at Die Waid after the event; in the company of Markus, Fabian, and Juraj.
Here we are already enjoying the magnificent panoramic view at Die Waid after the event; in the company of Markus, Fabian, and Juraj.
Reposted by Tomáš Bzdušek
New preprint alert!
arxiv.org/abs/2504.13012
Non-Hermitian Hamiltonians exhibit exceptional points (EPs) at which eigenvectors of several energy bands coalesce and that are usually captured by integer winding number.
In our work, we use the Hopf map to construct EPs with discrete Z_n invariants.
arxiv.org/abs/2504.13012
Non-Hermitian Hamiltonians exhibit exceptional points (EPs) at which eigenvectors of several energy bands coalesce and that are usually captured by integer winding number.
In our work, we use the Hopf map to construct EPs with discrete Z_n invariants.
April 24, 2025 at 4:32 PM
New preprint alert!
arxiv.org/abs/2504.13012
Non-Hermitian Hamiltonians exhibit exceptional points (EPs) at which eigenvectors of several energy bands coalesce and that are usually captured by integer winding number.
In our work, we use the Hopf map to construct EPs with discrete Z_n invariants.
arxiv.org/abs/2504.13012
Non-Hermitian Hamiltonians exhibit exceptional points (EPs) at which eigenvectors of several energy bands coalesce and that are usually captured by integer winding number.
In our work, we use the Hopf map to construct EPs with discrete Z_n invariants.
Origami "devil" that I gifted to Steve Kivelson for his 70th birthday while visiting Stanford last week.
Folded from 30cm shadow Thai paper.
Designed by Jun Maekawa: complete with wings, tail, horns, tongue, eyes, 10 fingers.. though unfortunately does not include a frisbee.
Happy birthday Steve!
Folded from 30cm shadow Thai paper.
Designed by Jun Maekawa: complete with wings, tail, horns, tongue, eyes, 10 fingers.. though unfortunately does not include a frisbee.
Happy birthday Steve!
April 1, 2025 at 7:42 PM
Origami "devil" that I gifted to Steve Kivelson for his 70th birthday while visiting Stanford last week.
Folded from 30cm shadow Thai paper.
Designed by Jun Maekawa: complete with wings, tail, horns, tongue, eyes, 10 fingers.. though unfortunately does not include a frisbee.
Happy birthday Steve!
Folded from 30cm shadow Thai paper.
Designed by Jun Maekawa: complete with wings, tail, horns, tongue, eyes, 10 fingers.. though unfortunately does not include a frisbee.
Happy birthday Steve!
Read more in Phys. Rev. B 111, 075162 (2025).
journals.aps.org/prb/abstract...
journals.aps.org/prb/abstract...
March 6, 2025 at 9:18 AM
Read more in Phys. Rev. B 111, 075162 (2025).
journals.aps.org/prb/abstract...
journals.aps.org/prb/abstract...
T-rex, designed by Tetsuya Gotani (instructions www.origami-shop.com/en/origamix-...).
I folded this model from a 50 cm mat octa paper - this turned out to be a poor choice, as the paper's thickness made it impossible to fold any of the fine details (claws, teeth..). How huge the result is though!
I folded this model from a 50 cm mat octa paper - this turned out to be a poor choice, as the paper's thickness made it impossible to fold any of the fine details (claws, teeth..). How huge the result is though!
February 1, 2025 at 6:37 PM
T-rex, designed by Tetsuya Gotani (instructions www.origami-shop.com/en/origamix-...).
I folded this model from a 50 cm mat octa paper - this turned out to be a poor choice, as the paper's thickness made it impossible to fold any of the fine details (claws, teeth..). How huge the result is though!
I folded this model from a 50 cm mat octa paper - this turned out to be a poor choice, as the paper's thickness made it impossible to fold any of the fine details (claws, teeth..). How huge the result is though!
Excited to host QuanSheng Wu during his visit to Zurich! We collaborated on only three papers together, but where did these get: 1x Nature, 1x Science, 1x Nature Physics. What a fruitful collaboration. QuanSheng, so great to have you back in Switzerland after 4 years!
January 16, 2025 at 3:13 PM
Excited to host QuanSheng Wu during his visit to Zurich! We collaborated on only three papers together, but where did these get: 1x Nature, 1x Science, 1x Nature Physics. What a fruitful collaboration. QuanSheng, so great to have you back in Switzerland after 4 years!
Now you can easily implement the hyperbolic version of your favorite tight-binding model without bothering much about the underlying group theory! ;-)
Many thanks to Patrick and to Marcelo for all the heavy lifting and for their fantastic piece of work!
Many thanks to Patrick and to Marcelo for all the heavy lifting and for their fantastic piece of work!
Excited to announce that the tandem packages HyperCells (for GAP) and HyperBloch (for Mathematica) for computing spectra of hyperbolic lattices are finally out!🥳
Check hypercells.net
Great amount of implementation by Patrick Lenggenhager & detailed tutorials by Marcelo Looser.
Check hypercells.net
Great amount of implementation by Patrick Lenggenhager & detailed tutorials by Marcelo Looser.
December 16, 2024 at 11:21 PM
Now you can easily implement the hyperbolic version of your favorite tight-binding model without bothering much about the underlying group theory! ;-)
Many thanks to Patrick and to Marcelo for all the heavy lifting and for their fantastic piece of work!
Many thanks to Patrick and to Marcelo for all the heavy lifting and for their fantastic piece of work!
New achievement unlocked!
Very grateful to @apsphysics.bsky.social and to Physical Review X for this token of appreciation!
Very grateful to @apsphysics.bsky.social and to Physical Review X for this token of appreciation!
December 16, 2024 at 11:15 PM
New achievement unlocked!
Very grateful to @apsphysics.bsky.social and to Physical Review X for this token of appreciation!
Very grateful to @apsphysics.bsky.social and to Physical Review X for this token of appreciation!
Link to our research group's BlueSky account!
Now transferring to BlueSkysome contents from our Twitter/X account!
[ x.com/UZH_TopoMat?... ]
Where else to start than with our research group's photo? Taken back in April 2024, from left to right you can see: Mykhailo, Aoxue, Marcelo, Tomáš, Askar and Zoltán.
[ x.com/UZH_TopoMat?... ]
Where else to start than with our research group's photo? Taken back in April 2024, from left to right you can see: Mykhailo, Aoxue, Marcelo, Tomáš, Askar and Zoltán.
December 16, 2024 at 11:12 PM
Link to our research group's BlueSky account!
I know that this is not Instagram -- but we have to launch this feed somewhere!
Behold: Styracosaurus, designed by Tetsuya Gotani, which I folded in July 2024 from a 50cm tissue foil paper.
Behold: Styracosaurus, designed by Tetsuya Gotani, which I folded in July 2024 from a 50cm tissue foil paper.
December 16, 2024 at 10:39 PM
I know that this is not Instagram -- but we have to launch this feed somewhere!
Behold: Styracosaurus, designed by Tetsuya Gotani, which I folded in July 2024 from a 50cm tissue foil paper.
Behold: Styracosaurus, designed by Tetsuya Gotani, which I folded in July 2024 from a 50cm tissue foil paper.