Paired Electrons and Topology
@petlabcpfs.bsky.social
Our group at Max Planck Institute (MPI CPfS) studies paired and unpaired electrons that form energy bands with trivial or nontrivial topology.
Takeaway message: Due to the interband coupling, and when the two distinct coherence peaks cannot be resolved, the weak modulation of
the coherence peak energy
can be misinterpreted in other works as a modulation of the superconducting
gap in the sense of a pair density wave.
the coherence peak energy
can be misinterpreted in other works as a modulation of the superconducting
gap in the sense of a pair density wave.
Most superconductors have more than one energy band where electrons can pair up to flow without resistance. Scattering off crystal defects enables electrons to jump between bands, frustrating the study of multi-band superconductivity—until now.
When Two Superconductors Become One
By exploiting defects in a superconductor, scientists have observed the switching of a material’s two superconducting states into one.
physics.aps.org
February 4, 2026 at 9:44 PM
Takeaway message: Due to the interband coupling, and when the two distinct coherence peaks cannot be resolved, the weak modulation of
the coherence peak energy
can be misinterpreted in other works as a modulation of the superconducting
gap in the sense of a pair density wave.
the coherence peak energy
can be misinterpreted in other works as a modulation of the superconducting
gap in the sense of a pair density wave.
We are very glad to have Souvik Das joining our group as a postdoc starting this month. Souvik just finished his PhD under the supervision of Prof. Stuart Parkin at MPI for Microstructure Physics. He will work on MBE growth and characterization of new superconducting films.
January 20, 2026 at 3:03 PM
We are very glad to have Souvik Das joining our group as a postdoc starting this month. Souvik just finished his PhD under the supervision of Prof. Stuart Parkin at MPI for Microstructure Physics. He will work on MBE growth and characterization of new superconducting films.
A great start of the new year: this paper is now published in Phys. Rev. B. link.aps.org/doi/10.1103/...
January 6, 2026 at 9:58 AM
A great start of the new year: this paper is now published in Phys. Rev. B. link.aps.org/doi/10.1103/...
Our new preprint is online! arxiv.org/abs/2512.04791
We observe anomalous charge modulations near surface impurities. This local symmetry-broken phase appears to arise from a subtle interplay between non-local impurity potentials, quantum geometry, and enhanced local correlations.
We observe anomalous charge modulations near surface impurities. This local symmetry-broken phase appears to arise from a subtle interplay between non-local impurity potentials, quantum geometry, and enhanced local correlations.
December 5, 2025 at 10:34 AM
Our new preprint is online! arxiv.org/abs/2512.04791
We observe anomalous charge modulations near surface impurities. This local symmetry-broken phase appears to arise from a subtle interplay between non-local impurity potentials, quantum geometry, and enhanced local correlations.
We observe anomalous charge modulations near surface impurities. This local symmetry-broken phase appears to arise from a subtle interplay between non-local impurity potentials, quantum geometry, and enhanced local correlations.
4 days remaining to apply!
New PhD position: we are looking for an enthusiastic student to explore the uncharted territory of chiral superconductors, and to control their chirality by ultrafast laser pulses, in collaboration with Prof. Stefan Kaiser at TU Dresden. Apply now: imprs-cpqm.mpg.de/227377/Chira...
Chiral superconductivity and chirality control
imprs-cpqm.mpg.de
November 26, 2025 at 1:54 PM
4 days remaining to apply!
New PhD position: we are looking for an enthusiastic student to explore the uncharted territory of chiral superconductors, and to control their chirality by ultrafast laser pulses, in collaboration with Prof. Stefan Kaiser at TU Dresden. Apply now: imprs-cpqm.mpg.de/227377/Chira...
Chiral superconductivity and chirality control
imprs-cpqm.mpg.de
October 2, 2025 at 10:36 AM
New PhD position: we are looking for an enthusiastic student to explore the uncharted territory of chiral superconductors, and to control their chirality by ultrafast laser pulses, in collaboration with Prof. Stefan Kaiser at TU Dresden. Apply now: imprs-cpqm.mpg.de/227377/Chira...
Yesterday Shamarita presented a poster about Aharonov-Bohm caging in classical photonic simulators through Floquet engineering — her master work from TU Kaiserslautern — in the 2nd DPG Fall Meeting in Göttingen.
September 9, 2025 at 10:48 AM
Yesterday Shamarita presented a poster about Aharonov-Bohm caging in classical photonic simulators through Floquet engineering — her master work from TU Kaiserslautern — in the 2nd DPG Fall Meeting in Göttingen.
Welcome our new group member Lichen Ji, who recently got her PhD at Tsinghua University studying superconducting proximity effect. She joined us this month as a postdoc (shared with TQC Thin Films group) and she will explore chiral superconductors with molecular beam epitaxy.
August 18, 2025 at 4:19 PM
Welcome our new group member Lichen Ji, who recently got her PhD at Tsinghua University studying superconducting proximity effect. She joined us this month as a postdoc (shared with TQC Thin Films group) and she will explore chiral superconductors with molecular beam epitaxy.
Reposted by Paired Electrons and Topology
🔬 From quantum tech to fusion reactors, superconductivity powers the future. Join leading scientists at M2S-2026 to explore the frontier of superconducting materials, theory & applications. 📅 Learn more here: www.fkf.mpg.de/8760227/2026...
#Superconductivity #M2S2026
#Superconductivity #M2S2026
August 7, 2025 at 9:23 PM
🔬 From quantum tech to fusion reactors, superconductivity powers the future. Join leading scientists at M2S-2026 to explore the frontier of superconducting materials, theory & applications. 📅 Learn more here: www.fkf.mpg.de/8760227/2026...
#Superconductivity #M2S2026
#Superconductivity #M2S2026
Why AI chatbots lie to us | Science www.science.org/doi/full/10....
Why AI chatbots lie to us
A few weeks ago, a colleague of mine needed to collect and format some data from a website, and he asked the latest version of Anthropic’s generative AI system, Claude, for help. Claude cheerfully agr...
www.science.org
July 28, 2025 at 11:05 AM
Why AI chatbots lie to us | Science www.science.org/doi/full/10....
Reposted by Paired Electrons and Topology
Heard of Scanning Tunneling Luminescence? It combines atomic-scale imaging with picosecond time resolution to reveal charge & light emission dynamics in single molecules—using ultrafast voltage pulses and photon correlations to probe quantum systems. Learn more: www.fkf.mpg.de/6562102/04_S...
July 22, 2025 at 9:18 AM
Heard of Scanning Tunneling Luminescence? It combines atomic-scale imaging with picosecond time resolution to reveal charge & light emission dynamics in single molecules—using ultrafast voltage pulses and photon correlations to probe quantum systems. Learn more: www.fkf.mpg.de/6562102/04_S...
Please share this with your colleagues: We are hiring a postdoctoral researcher specializing in angle-resolved photoemission spectroscopy (ARPES). The deadline is in two weeks: www.cpfs.mpg.de/3716612/job_...
Postdoctoral position (m/f/d)
Postdoctoral position ARPES, Leader Jacky Ge, Paired Electrons, Topology
www.cpfs.mpg.de
July 16, 2025 at 10:44 AM
Please share this with your colleagues: We are hiring a postdoctoral researcher specializing in angle-resolved photoemission spectroscopy (ARPES). The deadline is in two weeks: www.cpfs.mpg.de/3716612/job_...
Here we go again! Time lapse of touchdown and assembly.
July 5, 2025 at 5:33 AM
Here we go again! Time lapse of touchdown and assembly.
All boxes are open, and the cryogenic dewar is mounted on the vibration isolation table. Now comes the real heavy lifting — time to settle the system into the pit!
July 5, 2025 at 5:29 AM
All boxes are open, and the cryogenic dewar is mounted on the vibration isolation table. Now comes the real heavy lifting — time to settle the system into the pit!
(19 Jun) Today’s the big day — our STM has arrived! 🥳
All 7 crates📦are now safely stored in the basement. Huge thanks to everyone involved, and a special shoutout to our technician Ole for making it all run so smoothly.
Unpacking will happen in a couple of weeks — stay tuned!
All 7 crates📦are now safely stored in the basement. Huge thanks to everyone involved, and a special shoutout to our technician Ole for making it all run so smoothly.
Unpacking will happen in a couple of weeks — stay tuned!
July 5, 2025 at 5:28 AM
(19 Jun) Today’s the big day — our STM has arrived! 🥳
All 7 crates📦are now safely stored in the basement. Huge thanks to everyone involved, and a special shoutout to our technician Ole for making it all run so smoothly.
Unpacking will happen in a couple of weeks — stay tuned!
All 7 crates📦are now safely stored in the basement. Huge thanks to everyone involved, and a special shoutout to our technician Ole for making it all run so smoothly.
Unpacking will happen in a couple of weeks — stay tuned!