Björn Sbierski
Coordinates
I am a START-fellow of the Munich Center for Quantum Science and Technology
(MCQST), located at Ludwig-Maximilians Universität (LMU) München hosted by the group of
Jan von Delft (since summer 2021).
Before, I obtained my PhD under the supervision of Piet Brouwer (Thesis:
“On disorder effects in topological insulators and semimetals”, defended at May 11, 2016), and joined the Emmy-Noether group of Christoph Karrasch at Freie Universität Berlin for a first postdoc. In 2019-2021, I was a Leopoldina-Postdoc with Joel Moore at the University of California, Berkeley.
eMail: b.sbierski@lmu.de
Group members
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Benedikt Schneider
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Frederic Bippus
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Schneider.Benedikt@lmu.de
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Frederic.Bippus@lmu.de
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PhD student since 10/2021
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Master thesis since 10/2022
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Open positions
Research interests
Systems:
- disordered systems and network models
- topological insulators, superconductors, semimetals and Dirac materials
- (frustrated) quantum spins
- cold atom and Rydberg quantum simulators
Methods:
- scattering matrix formalism
- diagrammatic, functional and non-perturbative approaches
- renormalization group approaches (Wilsonian RG, -expansions, functional RG)
Phenomena:
- topological physics
- quantum transport, localization and disorder-driven phase transitions
- (quantum) critical behavior and universality
Publications (ordered according to arXiv submission date)
2022
- (28)
B. Schneider, D. Kiese, B.S.: Taming pseudo-fermion functional renormalization for quantum spins: Finite-temperatures and the Popov-Fedotov trick, PRB 106, 235113 (2022), [ArXiv:2209.13484]
2021
- (27)
E. J. Dresselhaus, B.S., I. A. Gruzberg: Scaling collapse of longitudinal conductance near the integer quantum Hall transition, PRL 129.026801 (2022), [Editors' suggestion] [ArXiv:2112.09847].
- (26)
N. Niggemann, J. Reuther, B.S.: Quantitative functional renormalization for three-dimensional quantum Heisenberg models, SciPost Phys. 12, 156 (2022), [ArXiv:2112.08104].
- (25)
B.S., M. Geier, A-P. Li, M. Brahlek, R.G. Moore, J. E. Moore, Identifying Majorana vortex modes via non-local transport, PRB 106, 035413 (2022), [ArXiv:2107.11226].
- (24)
E. J. Dresselhaus, B.S., I. A. Gruzberg: Numerical evidence for marginal scaling at the integer quantum Hall transition, Annals of Physics 435, 168676 (2021) [ArXiv:2101.01716].
2020
- (23)
N. Niggemann, B.S., J. Reuther: Frustrated Quantum Spins at finite Temperature: Pseudo-Majorana functional RG approach, PRB 103.104431 (2021) [ArXiv:2012.14836].
- (22)
B.S., E. J. Dresselhaus, J. E. Moore, I. A. Gruzberg: Criticality of 2d disordered Dirac fermions in the unitary class and universality of the integer quantum Hall transition, PRL 126.076801 (2021) [ArXiv:2008.09025].
- (21)
B.S., S. Syzranov: Non-Anderson critical scaling of the Thouless conductance in 1D, Annals of Physics 418, 168169 (2020) [ArXiv:2002.12299].
- (20)
Z. Shi, B.S., P. W. Brouwer: Disorder correction to the minimal conductance of a nodal-point semimetal, PRB 102.024204 (2020) [ArXiv:2002.10353].
2019
- (19)
B.S., J. Karcher, M. S. Foster: Spectrum-wide quantum criticality at the surface of class AIII topological phases: An "energy stack" of integer quantum Hall plateau transitions, PRX 10, 021025 (2020) [ArXiv:1912.06748]
See also Rice university press release.
2018
- (18)
B.S., C. Fräßdorf: Strong disorder in nodal semimetals: Schwinger-Dyson–Ward approach, PRB 99.020201 (2019), [ArXiv:1808.09860]
- (17)
B.S., C. Karrasch: Topological invariants for the Haldane phase of interacting SSH chains -- a functional RG approach, PRB 98.165101 (2018), [ArXiv:1805.00839]
- (16)
L. Markhof, B.S., V. Meden, C. Karrasch: Detecting phases in one-dimensional many-fermion systems with the functional renormalization group, PRB 97.235126 (2018), [ArXiv:1803.00272]
2017
- (15)
J. Behrends, F. Kunst, B.S.: Transversal magnetotransport in Weyl semimetals: Exact numerical approach, PRB 97.064203 (2018), [ArXiv:1801.00126]
- (14)
B.S., C. Karrasch: Second order functional renormalization group approach to one-dimensional systems in real and momentum space, PRB 96.235122 (2017), [ArXiv:1710.06373]
- (13)
S.-H. Lin, B.S., F. Dorfner, C. Karrasch, F. Heidrich-Meisner: Many-body localization of spinless fermions with attractive interactions in one dimension, SciPost Phys. 4, 002 (2018), [ArXiv:1707.06759]
- (12)
B.S., K. A. Madsen, P. W. Brouwer, C. Karrasch: Quantitative analytical theory for disordered nodal points, PRB 96.064203 (2017), [ArXiv:1704.08457]
2016
- (11)
M. Trescher, B.S., P. W. Brouwer, E. J. Bergholtz: Tilted Disordered Weyl Semimetals, PRB 95.045139 (2017), [ArXiv:1611.02513]
- (10)
B.S., K. Decker, P. W. Brouwer: Weyl node with random vector potential, PRB 94.220202(R) (2016), [Editors' suggestion] [ArXiv:1606.09209]
- (9)
B.S., M. Trescher, E. J. Bergholtz, P. W. Brouwer: Disordered double Weyl node: Comparison of transport and density-of-states calculations, PRB 95.115104, (2017) [ArXiv:1606.06941]
- (8)
B.S., M. Schneider, P. W. Brouwer: The weak side of strong topological insulators, PRB 93.161105(R) (2016), [ArXiv:1602.03443]
2015
- (7)
B.S., E. J. Bergholtz, P. W. Brouwer: Quantum critical exponents for a disordered three-dimensional Weyl node, PRB 92.115145 (2015) [ArXiv:1505.07374]
- (6)
M. Trescher, B.S., P. W. Brouwer, E. J. Bergholtz: Quantum transport in Dirac materials: Signatures of tilted and anisotropic Dirac and Weyl cones, PRB 91.115135 (2015) [ArXiv:1501.04034]
(Featured in the 'Journal Club for Condensed Matter Physics' in a commentary by Carlo Beenakker.)
2014 and earlier
- (5)
B.S., G. Pohl, E. J. Bergholtz, P. W. Brouwer: Quantum Transport of Disordered Weyl Semimetals at the Nodal Point, PRL 113.026602 (2014) [ArXiv:1402.6653]
- (4)
B.S. and P.W. Brouwer: Z2 phase diagram of three-dimensional disordered topological insulators via a scattering matrix approach, PRB 89.155311 (2014) [Editors' suggestion] [ArXiv1401.7461]
- (3)
B.S., M. Hanl, A. Weichselbaum, H. E. Türeci, M. Goldstein, L. I. Glazman, J. von Delft, and A. Imamoglu: Proposed Rabi-Kondo Correlated State in a Laser-Driven Semiconductor Quantum Dot, PRL 111.157402 (2013) [ArXiv1211.6837]
- (2)
B.S., G. F. Quinteiro and P. I. Tamborenea: Twisted-light-induced intersubband transitions in quantum wells at normal incidence, J. Phys. Condens. Matter 25 385301 (2013) [ArXiv1309.1729]
(see also blog post)
- (1)
B.S., P. Gieschke and O. Paul, Shear Piezoresistance in MOSFET Devices Under General Operating Conditions, IEEE Trans. Electron Devices, vol. 58, no. 12, pp. 4145-4154, (2011).
Conference talks, seminars, posters
2022
- 10/2022: Tübingen: Kick-off Meeting DFG Research Unit “Long-range interacting quantum spin systems out of equilibrium”
Invited Talk: “Functional Renormalization for Quantum Spins”
- 09/2022: Regensburg: DPG conference
Talk: “Pseudo-Majoranas for quantum spin simulation”
- 08/2022: Berlin: ERG2022 conference
Talk: “Pseudo-Majoranas for quantum spin simulation”
- 07/2022: Sonthofen, DE: MCQST annual conference
Invited talk: “Pseudo-Majoranas for quantum spin simulation”
- 06/2022: MPI for solid state research, Stuttgart: Workshop CNQM22
Poster: “Pseudo-Majoranas for Spin-1/2: Advanced Diagrammatics and Applications”
- 04/2022: Tübingen: Condensed matter seminar (host: S. Andergassen)
Talk: “Spins, pseudo-Majoranas and the functional RG”
- 04/2022: MPI for solid state research, Stuttgart: Quantum many-body seminar (host: E. König)
Talk: “Spins, pseudo-Majoranas and the functional RG”
- 03/2022: Stuttgart University: Condensed matter seminar (host: M. Daghofer)
Talk: “Spins, pseudo-Majoranas and the functional RG”
- 02/2022: Munich (LMU), Theoretical Nanophysics Group Seminar (host: L. Pollet)
Talk: “Spins, pseudo-Majoranas and the functional RG”
- 01/2022: Berlin (Freie Universität), seminar of quantum magnetism group (J. Reuther)
Talk: “Functional RG for frustrated 3d quantum magnets: A quantitative approach”
2021
- 07/2021: Munich, DE: MCQST annual conference
Poster: “Identifying Majorana vortex modes via non-local transport”
- 05/2021: Santa Cruz, USA: Condensed matter seminar
Talk: “Majorana vortex modes in iron based superconductors - a non-local transport perspective”
- 04/2021: Berlin (Freie Universität), seminar of quantum magnetism group (J. Reuther)
Talk: “Majorana vortex modes in iron based superconductors - a non-local transport perspective”
- 03/2021: APS march meeting
Talk: “Criticality of two-dimensional disordered Dirac fermions in the unitary class”.
- 01/2021: Cologne, Condensed Matter Theory Seminar
Talk: “Spin systems, Pseudo-Majoranas and the functional RG”
2020
- 08/2020: Online conference: Localisation 2020
Talk: “Criticality of two-dimensional disordered Dirac fermions in the unitary class”
- 03/2020: Denver, USA: APS march meeting
Invited talk: “Spectrum-wide quantum criticality at the surface of class AIII topological phases: An energy stack of integer quantum Hall plateau transitions”. (CANCELLED DUE TO COVID-19)
- 01/2020: Berlin, München, Würzburg, Dresden
Invited talks: “Surviving localization on the surface of chiral topological insulators”
2019
- 12/2019: Berkeley, USA: Condensed matter theory lunch journal club
Talk: “Surviving localization on the surface of chiral topological insulators”
- 11/2019: Santa Barbara, USA: KITP conference “Spintronics Meets Topology in Quantum Materials”
Poster: “Spectrum-wide quantum criticality at the surface of class AIII topological phases”
- 06/2019: Berkeley, USA: Condensed matter theory lunch journal club
Talk: “Pseudo-Fermion functional RG for spin systems”
- 05/2019: Santa Cruz, USA: Condensed matter seminar
Invited talk: “Strong disorder in nodal semimetals: Schwinger-Dyson–Ward approach”
- 05/2019: Berkeley, USA. Quantum matter seminar
Talk: “Strong disorder in nodal semimetals: Schwinger-Dyson–Ward approach”
- 03/2019: Berlin, Germany: Berlin-Cologne meeting on QSL and fRG
Talk: “Majorana-fRG and spin models”
- 03/2019: Boston, USA: APS March meeting
Talk: “Strong disorder in nodal semimetals: Schwinger-Dyson–Ward approach”
- 02/2019: Köln, Germany. Cologne-Berlin mini conference
Talk: “Non-perturbative approach to disorder in nodal semimetals”.
- 01/2019: Karlsruhe, Germany. Condensed matter seminar of Mirlin group.
Invited talk: “Non-perturbative approach to disorder in nodal semimetals”.
2018
- 09/2018: Dresden, Germany: Conference on Anderson localization and interactions
Poster: “Strong disorder in nodal semimetals: Schwinger-Dyson–Ward approach”
- 07/2018: Paris, France: Conference on Exact Renormalization Group
Poster: “Topological invariants for the Haldane phase of interacting SSH chain from fRG”
- 06/2018: Berlin, Germany: Dahlem center seminar
Talk: “Non-perturbative approach to disorder in Dirac semimetals”
2017
- 11/2017: Stockholm, Sweden: Condensed matter seminar.
Invited talk: “Quantitative analytical theory for disordered nodal points”
- 09/2017: Dresden, Germany: Korrelationstage (conference)
Poster: “Quantitative analytical theory for disordered nodal points”
- 07/2017: Bad Honneff, Germany: CRC 183 summer school
Poster: “Quantitative analytical theory for disordered nodal points”
- 05/2017: Stockholm, Sweden: Nordita-Conference “Frontiers of topological quantum matter”
Poster: “Quantitative analytical theory for disordered nodal points”
- 02/2017: RWTH Aachen, Germany: Volker Meden's group seminar
Invited talk: “fRG approach to spinless fermions in 1d”
2016
- 11/2016: Langeoog, Germany: CRC 183 kickoff meeting.
Invited talk: “Disorder effects in Weyl semimetals”
- 10/2016: Würzburg University, Germany: Björn Trauzettel's group seminar
Invited talk: “Disorder effects in Weyl semimetals”
- 07/2016: Boulder, USA: Summerschool for condensed matter physics
Poster: “Weyl Nodes with vector disorder”
- 03/2016: Würzburg, Germany: Helmholtz Virtual Institute student's retreat
Invited talk: “Disordered Weyl Nodes”
- 03/2016: Dresden, Germany: Workshop on Topological Phenomena in Novel Quantum Matter
Talk: “Disordered double Weyl nodes”
2015
- 06/2015: Berlin, Germany: Annual workshop of the Virtual Institute "New states of matter and their excitations"
Poster: “The weak side of strong topological insulators”.
- 04-05/2015: Pasadena, USA: Research stay at Caltech with Gil Refael
Invited talk: “Quantum criticality in disordered Weyl semimetals”
- 02/2015: Tel Aviv, Israel: FU Berlin - Tel Aviv University Research Workshop: "Spin orbit materials"
Invited talk:”'Quantum criticality in disordered Weyl semimetals”.
2014 and earlier
- 10/2014: Dresden, Germany: International Focus Workshop 'New states of matter and their excitations'
Talk: “Disordered Weyl Semimetals”.
- 08/2014: Les Houches, France: Summerschool 'Topological aspects of condensed matter physics'
Poster: “Disordered Weyl Semimetals”.
- 07/2014: Mainz, Germany: Jairo Sinova's group seminar
Invited seminar: “Disordered Weyl Semimetals”.
- 06/2014: Copenhagen, Denmark: QDev/NBIA summerschool
Poster: “Disordered Weyl Semimetals”.
- 10/2013: Rehovot, Israel: Minerva Group Meeting - Weizmann Institute of Science
Invited talk: “Scattering Approach to Disordered 3d Time Reversal Invariant Topological Insulators”.
- 07/2013: Dresden, Germany: Conference on Spin Orbit Entanglement
Poster: “Scattering Approach to Disordered 3d Time Reversal Invariant Topological Insulators”
- 08/2012: Zurich, Switzerland: ICPS conference
Poster: “Resonance Fluorescence from a Kondo-Exciton”.
- 08/2012: Stonehill College, USA: Gordon Research Conference on Quantum Science
Poster: “Resonance Fluorescence from a Kondo-Exciton”
Selected collaborators
Emil Bergholtz (Stockholm, Sweden)
Piet Brouwer (Berlin, DE)
Matthew S. Foster (Rice University, USA)
Ilya Gruzberg (Ohio State University, USA)
Christoph Karrasch (Braunschweig, DE)
Joel Moore (University of California, Berkeley, USA)
Volker Meden (RWTH Aachen, DE)
Johannes Reuther (Berlin, DE)
Sergey Syzranov (University of California, Santa Cruz, USA)
Thesis supervision
LMU Munich
- Benedikt Schneider (PhD thesis, ongoing)
- Frederic Bippus (Master thesis, ongoing)
- Alejandro Fernández-Concha (Master thesis 2022 - Velocity disorder in two-dimensional Dirac nodes)
- Samira Hatoum (Master thesis 2022 - Numerical solution of the spin fRG for the Ising Model)
UC Berkeley
- Elisabeth Dresselhaus (PhD research on amorphous topological insulators, with Prof. Joel Moore, ongoing)
FU Berlin
- Nils Niggemann (Master Thesis 2020 - Majorana spin fRG, with Prof. Johannes Reuther)
- Alexander Penner (Bachelor Thesis 2018 - Functional RG for Majorana fermions, with Dr. Christoph Karrasch)
- Lukas Gräfner (Bachelor Thesis 2018 - Numerical investigation of localization in the presence of chiral modes, with Dr. Christoph Karrasch)
- Marcel Hinsche (Bachelor Thesis 2017 - Absence of bound states in localized vector potentials in 2d Dirac systems, with Prof. Piet Brouwer)
- Kevin Decker (Bachelor Thesis 2016 - Transport through single Weyl nodes in vectorial disorder, with Prof. Piet Brouwer)
- Clement le Priol (Master Thesis 2016 - Dislocation lines in strong and weak top. insulators, with Prof. Piet Brouwer)
- Nils Buchholz (Bachelor Thesis 2015 - Minimal Conductance in Disordered Graphene, with Prof. Piet Brouwer)
- Gregor Pohl (Research Project 2014 - Disordered Weyl Semimetals, with Prof. Piet Brouwer)
- Gunnar Riemenschneider (Bachelor Thesis 2014 - Density of States in Disordered Weyl Semimetals, with Prof. Piet Brouwer)
- Farhad Arbabzadeh (Master Thesis 2014 - Disordered Crystalline Topological Insulators, with Prof. Piet Brouwer)
Teaching
at LMU München:
at Freie Universität Berlin:
- Summer term 2018: Analytical Mechanics (Tutorial and substituting a few lectures, course taught by Piet Brouwer)
- Summer term 2017: Analytical Mechanics (Head assistant and substituting a few lectures, course taught by Christoph Karrasch)
- Summer term 2016: Analytical Mechanics (Head assistant for lecture by Christoph Karrasch)
- Winter term 2015/16: Einführung in die Physik (Tutorial for lecture by Piet Brouwer)
- Winter term 2014/15: Analytical Mechanics (Tutorial for lecture by Stefanie Russ)
- Winter term 2013/14: Precalculus course (Tutorial for lecture by Piet Brouwer)
Referee
- I serve as a referee for Phys. Rev. Letters, Phys. Rev. X, Rhys. Rev. Research and Phys. Rev. B on a regular basis.
