Topological Systems

Investigations of topological concepts in condensed matter systems. Creation, detection and manipulation of topologically protected excitations.

Contributions to QuantumFrontiers

  • Workshops with international guests and visibility
  • Reoccurring lecture series aimed especially at PhDs on the topic of topological systems
  • Special lecture course (“Spezialvorlesungen”) on the topic of 'Topological Systems and Quantum Computing’
  • Investigations of topological concepts in Condensed Matter
  • Transport in quantum Hall systems, two-dimensional materials like graphene and its bilayers, cold atom systems
  • Physics of topological superconductors
  • Investigations of new transport phenomena associated with topological excitations (edge states, skyrmions, Majorana zero modes)
  • Detection and manipulation of non-abelian anyons

Collaborative Innovation

  • Twisted bilayer physics in cold atom systems (Recher TUBS, Santos LUH)
  • Electron optics setups in quantum Hall systems (Hohls PTB, Recher TUBS, Schumacher PTB)
  • Non-equilibrium properties of many-body systems described by tensor networks (Karrasch TUBS, Osborne LUH)
  • Raman spectroscopy with twisted light of chiral molecular liquids (Lemmens TUBS, Surzhykov PTB)

Scientific Output

  • Publications
    Kalin J, Sievers S, Schumacher HW, Füser H, Bieler M, Bauer A et al. Influence of the magnetovolume effect on the transient reflectivity of MnSi. Physical Review B. 2024 Jul 11;110(1). doi: 10.1103/PhysRevB.110.014415
    Kalin J, Sievers S, Schumacher HW, Abram R, Füser H, Bieler M et al. Optical creation and annihilation of skyrmion patches in a chiral magnet. Physical review applied. 2024 Mär 29;21(3):034065. doi: 10.1103/PhysRevApplied.21.034065
    Osborne TJ, Stottmeister A. Conformal Field Theory from Lattice Fermions. Communications in Mathematical Physics. 2023 Feb;398(1):219-289. Epub 2022 Nov 21. doi: 10.48550/arXiv.2107.13834, 10.1007/s00220-022-04521-8
    Paul GC, Recher P, Santos L. Particle dynamics and ergodicity breaking in twisted-bilayer optical lattices. Physical Review A. 2023 Nov 2;108(5):053305. doi: 10.48550/arXiv.2306.01588, 10.1103/PhysRevA.108.053305
    Denisova K, Lemmens P, Wulferding D, Berdonosov P, Dolgikh V, Murtazoev A et al. Cu9O2(SeO3)4Cl6 revisited: Crystal structure, Raman scattering and first-principles calculations. Journal of alloys and compounds. 2022 Feb 15;894:162291. Epub 2021 Okt 12. doi: 10.1016/j.jallcom.2021.162291
    Jamadagni A, Weimer H. Operational definition of topological order. Physical Review B. 2022 Aug 31;106(8):085143. doi:, 10.1103/PhysRevB.106.085143
    Kalin J, Sievers S, Füser H, Schumacher HW, Bieler M, García-Sánchez F et al. Optically excited spin dynamics of thermally metastable skyrmions in Fe0.75Co0.25Si. Physical Review B. 2022 Aug 24;106(5):054430. doi: 10.1103/PhysRevB.106.054430
    Probst B, Virtanen P, Recher P. Sub- to Super-Poissonian crossover of current noise in helical edge states coupled to a spin impurity in a magnetic field. Physical Review B. 2022 Aug 4;106(8):085406. doi: 10.1103/PhysRevB.106.085406
    Belke C, Locmelis S, Thole L, Schmidt H, Behrens P, Haug RJ. Thickness-dependent gap energies in thin layers of Hf Te5. 2D Materials. 2021 Jul;8(3):035029. Epub 2021 Mai 3. doi: 10.1088/2053-1583/abf98b
    Beule CD, Dominguez F, Recher P. Network model and four-terminal transport in minimally twisted bilayer graphene. 2021 Jul 10. Epub 2021 Jul 10.
    Bockhorn L, Rode JC, Gnörich L, Zuo P, Brechtken B, Haug RJ. Interlayer configurations of self-assembled folded graphene. Applied physics letters. 2021 Apr 26;118(17):173101. doi: 10.1063/5.0047602
    Büscher F, Müllner S, Wulferding D, Pashkevich YG, Gnezdilov V, Peshkov AA et al. Raman scattering of plane-wave and twisted light off chiral molecular liquids. Low temperature physics. 2021 Nov;47(11):959-965. doi: 10.1063/10.0006577
    De Beule C, Dominguez F, Recher P. Effective Floquet model for minimally twisted bilayer graphene. Physical Review B. 2021 Mai 21;103(19):195432. doi: 10.1103/PhysRevB.103.195432
    Fernández Scarioni A, Barton C, Corte-León H, Sievers S, Hu X, Ajejas F et al. Thermoelectric Signature of Individual Skyrmions. Physical review letters. 2021 Feb 16;126(7):077202. doi: 10.1103/PhysRevLett.126.077202
    Glamazda A, Sharafeev A, Bohle R, Lemmens P, Choi KY, Chou FC et al. Легування від CDW до топологічної надпровідності: роль дефектів у розсіюванні фононів у нецентросиметричному PbxTaSe2. Fizika Nizkikh Temperatur. 2021 Nov;47(11):994-1002.
    Gnezdilov V, Kurnosov V, Pashkevich Y, Bera AK, Islam ATMN, Lake B et al. Non-Abelian statistics in light-scattering processes across interacting Haldane chains. Physical Review B. 2021 Okt 11;104(16):165118. Epub 2021 Okt 11. doi: 10.1103/physrevb.104.165118
    Hong SJ, Xiao X, Wulferding D, Belke C, Lemmens P, Haug RJ. Strain-induced doping and zero line mode at the fold of twisted Bernal-stacked bilayer graphene. 2D Materials. 2021 Okt 18;8(4):045009. doi: 10.1088/2053-1583/ac152e
    Ksenofontov V, Pashkevich YG, Panthöfer M, Gnezdilov V, Babkin R, Klauer R et al. FeMoO4 revisited: Crosslike 90° noncollinear antiferromagnetic structure caused by dzyaloshinskii-moriya interaction. Journal of Physical Chemistry C. 2021 Mär 18;125(10):5947-5956. Epub 2021 Mär 4. doi: 10.1021/acs.jpcc.1c01134
    Madsen KA, Brouwer PW, Recher P, Silvestrov PG. Interference effects induced by a precessing easy-plane magnet coupled to a helical edge state. Physical Review B. 2021 Mär 24;103(11):115142. doi: 10.1103/PhysRevB.103.115142
    Osborne TJ, Stottmeister A. Quantum Simulation of Conformal Field Theory. 2021 Sep 29. Epub 2021 Sep 29. doi: 10.48550/arXiv.2109.14214
    Prikhodko OO, Bidasyuk YM. Projected gross–pitaevskii equation for ring-shaped bose–einstein condensates. Ukrainian Journal of Physics. 2021 Apr 7;66(3):198-205. doi: 10.15407/ujpe66.3.198
    Budker D, Crespo López-Urrutia JR, Derevianko A, Flambaum VV, Krasny MW, Petrenko A et al. Atomic Physics Studies at the Gamma Factory at CERN. Annalen der Physik. 2020 Aug 13;532(8):2000204. doi: 10.1002/andp.202000204
    De Beule C, Dominguez F, Recher P. Aharonov-Bohm Oscillations in Minimally Twisted Bilayer Graphene. Physical review letters. 2020 Aug 28;125(9):096402. doi: 10.1103/PhysRevLett.125.096402
    De Beule C, Silvestrov PG, Liu MH, Recher P. Valley splitter and transverse valley focusing in twisted bilayer graphene. Physical Review Research. 2020 Okt 28;2(4):043151. doi: 10.1103/PhysRevResearch.2.043151
    Duan Y, Bidasyuk YM, Surzhykov A. Symmetry breaking and phase transitions in Bose-Einstein condensates with spin-orbital-angular-momentum coupling. Physical Review A. 2020 Dez 24;102(6):063328. doi: 10.1103/PhysRevA.102.063328
    Ekström J, Recher P, Schmidt TL. Transport properties of coupled Majorana bound states in the Coulomb blockade regime. Physical Review B. 2020 Mai 15;101(19):195420. doi: 10.1103/PhysRevB.101.195420
    Haidekker Galambos T, Hoffman S, Recher P, Klinovaja J, Loss D. Superconducting Quantum Interference in Edge State Josephson Junctions. Physical review letters. 2020 Okt;125(15):157701. doi: 10.1103/PhysRevLett.125.157701
    Novik EG, Trauzettel B, Recher P. Transport signatures of a junction between a quantum spin Hall system and a chiral topological superconductor. Physical Review B. 2020 Jun 15;101(23):235308. doi: 10.1103/PhysRevB.101.235308
    Park S, Sim HS, Recher P. Electron-Tunneling-Assisted Non-Abelian Braiding of Rotating Majorana Bound States. Physical review letters. 2020 Okt 28;125(18):187702. doi: 10.1103/PhysRevLett.125.187702
    Schulz F, Budich JC, Novik EG, Recher P, Trauzettel B. Voltage-tunable Majorana bound states in time-reversal symmetric bilayer quantum spin Hall hybrid systems. Physical Review B. 2019 Okt 25;100(16):165420. doi: 10.1103/physrevb.100.165420

TG Members

  • Involved Members and their Relevant Expertise
    Members Institution Relevant Expertise
    Patrik Recher, Leader TUBS Theory of Emergent Correlated Quantum Matter; Josephson Junctions; Twisted Bilayer Graphene; Twisted-bilayer-graphene physics in ultracold atoms in optical potentials
    Peter Silvestrov TUBS Theory of Emergent Correlated Quantum Matter
    Daniel Frombach TUBS Josephson Junctions, Topological Systems
    Hans Werner Schumacher PTB Macroscopic Quantum Standards; Precision current metrology of single electron pumps; NV-centre-based magnetometry
    Thomas Gerster PTB precision current metrology of single electron pumps
    Alexander Fernandez-Scarioni PTB Macroscopic Quantum Standards
    David Reifert PTB Macroscopic Quantum Standards
    Rolf Haug LUH Two-dimensional materials, Electrical Quantum Effects, Magnetic Quantum Effects
    Michael Oestreich LUH Spin and charge dynamics of single carriers in single semiconductor quantum dots
    Lina Bockhorn LUH Electrical Quantum Effects
    Lena Bittermann TUBS  
    Meinhard Schilling TUBS Electronic Quantum Metrology; Optical Voltage Standard - Fast Prototyping and HTS Superconductors
    Hansjörg Scherer PTB Anomolous Quantum Hall Effect with Topological Materials
    Tobias Osborne LUH Tensor networks for many body localized systems
    Ganesh Paul LUH / TUBS Tensor networks for many body localized systems
    Christoph Karrasch TUBS Tensor networks for many body localized systems
    Hendrik Weimer LUH Theory of Dynamics of Manybody Quantum Systems
    Luis Santos LUH Theory of Dynamics of Manybody Quantum Systems; Twisted-bilayer-graphene physics in ultracold atoms in optical potentials
    Fernando Dominguez TUBS  
    Wolfram Brenig TUBS strongly correlated electron systems, quantum transport, quantum critical systems, low dimensional quantum magnets
    Peter Lemmens TUBS Propagation of Twisted Light through Media: New Possibilities for Information Transfer; Spectroscopics of Topological Materials
    Andrey Surzhykov PTB Light-Matter Interfaces and Dynamics
    Yuriy Bidasyuk PTB Interaction of twisted light with Bose-Einstein condensates