Fachbereich Mathematik

Prof. Dr. Marius Lemm

Area: Mathematical Physics
Marius Lemm

Contact Information

University of Tübingen
Department of Mathematics
Auf der Morgenstelle 10
72076 Tübingen

Room: C4 P39
Tel: +49 (0)7071 29 78563
E-Mail: marius.lemm[at]uni-tuebingen.de

Open postdoc position

I currently have an open postdoc position in mathematical physics

  • starting date: early-mid 2025 (flexible)
  • duration: 2 years
  • application deadline: January 15, 2025

More information here

Open Ph.D. position

I currently have an open Ph.D. position in mathematical physics

  • starting date: early-mid 2025 (flexible)
  • duration: 3 years
  • application deadline: January 15, 2025

More information here

In general, if you're a young researcher interested in working with me, please feel invited to message me if you are interested in a Ph.D. or Postdoc position at any time. Be sure to include a CV and a transcript or research statement. Please note that during certain busy periods, I may not be able to respond to all messages of this kind.

Scientific background

I moved to the University of Tübingen in 2021 from EPFL where I was Assistant Professor of Mathematics. Before that, I held a Benjamin Peirce fellowship at Harvard University and I was a postdoctoral member at the Institute for Advanced Study in Princeton. My postdoc mentors were Horng-Tzer Yau, Wilhelm Schlag, and Tom Spencer. I obtained my Ph.D. in mathematics in 2017 at Caltech under the supervision of Rupert L. Frank.

Detailed CV

Research Interests 

I am mainly interested in applying tools from mathematical analysis to problems originating in quantum physics. The methods I use come from the calculus of variations, ergodic theory, harmonic analysis, and spectral theory. Topics that I have worked on recently include:

  • Quantum many-body systems (spectral gaps, Lieb-Robinson bounds)
  • Matrix analysis (multivariate trace inequalities, quantum entropy)
  • Random matrices (universal eigenvalue statistics for dynamically defined ensembles)
  • Quantitative homogenization theory (Green's function estimates and the Bourgain-Spencer conjecture)
  • Spectral theory of ergodic Schrödinger operators

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My research is supported by the DFG (German Science Foundation) through the Collaborative Research Center (SFB TRR 352) Mathematics of Many-Body Quantum Systems and Their Collective Phenomena

From January 2025, my research is also supported by the ERC Starting Grant in mathematics MathQuantProp: The Mathematics of Quantum Propagation.

International M.Sc. Program in Mathematical Physics

I serve as program coordinator of the interdisciplinary two-year M.Sc. program in mathematical physics offered jointly by the math and physics departments in Tübingen.

More info about Tübingen M.Sc. Mathematical Physics (including how to apply)

 

Current Courses

Winter Term 2024/25

Summer Term 2024

Archive

Publications

  2. (with S. Rademacher and J. Zhang) Local enhancement of the mean-field approximation for bosons  arXiv
  3. (with T. Wessel) Enhanced Lieb-Robinson bounds for commuting long-range interactions   arXiv
  4. (with B. Nachtergaele, S. Warzel, and A. Young) The charge gap is greater than the neutral gap in fractional quantum Hall systems   arXiv
  5. (with A. Lucia) On the critical finite-size gap scaling for frustration–free Hamiltonians   arXiv
  6. (with M. Duerinckx and F. Pagano) On Bourgain's approach to stochastic homogenization  arXiv 
  7. (with T. Kuwahara) Enhanced Lieb-Robinson bounds for a class of Bose-Hubbard type Hamiltonians   arXiv
  8. (with S. Rademacher) Out-of-time-ordered correlators of mean-field bosons via Bogoliubov theory, to appear in Quantum  arXiv
  9. (with B. Hinrichs and O. Siebert) On Lieb-Robinson bounds for a class of continuum fermions, to appear in Ann. Henri Poincaré   arXiv 
  10. (with C. Rubiliani and J. Zhang) On the microscopic propagation speed of long-range quantum many-body systems  arXiv
  11. (with J. González-Carbajal and J. Garcia-Suarez) On the lowest-frequency bandgap of 1D phononic crystals, to appear in Eur. J. Mech. A-Solid.  arXiv   Article
  12. (with C. Rubiliani, I.M. Sigal, and J. Zhang) Information propagation in long-range quantum many-body systems, Phys. Rev. A 108 (2023), L060401  arXiv    Article
  13. (with S. Breteaux, J. Faupin, D.H. Ou Yang, I.M. Sigal, and J. Zhang) Light cones for open quantum systems, Rev. Math. Phys. 36 (2024), no. 09, 2460004  arXiv   Article
    1. (with P. Hayden and J. Sorce) Reflected entropy: Not a correlation measure, Phys. Rev. A  107 (2023), L050401   arXiv   Article
    2. (with O. Siebert) Thermal Area Law for Lattice Bosons, Quantum 7 (2023), 1083   arXiv  Article
    3. (with S. Breteaux, J. Faupin and I.M. Sigal) Maximal speed of propagation in open quantum systems, In: The Physics and Mathematics of Elliott Lieb, The 90th Anniversary Volume I, Rupert L. Frank et al. (eds.), 109–130, EMS Press, Berlin, 2022   arXiv   Article
    4. (with R. Andrei and R. Movassagh) The spin-one Motzkin chain is gapped for any area weight t<1   arXiv
    5. (with O. Siebert) Bose-Einstein condensation on hyperbolic spaces, J. Math. Phys. 63 (2022), 081903   arXiv   Article
    6. (with A. Adhikari) Universal Eigenvalue Statistics for Dynamically Defined Matrices, J. d'Analyse Math. 153 (2024), 169–218
      arXiv   Article
    7. (with D. Xiang) Quantitatively improved finite-size criteria for spectral gaps, J. Phys. A 55 (2022), 295203  arXiv   Article
    8. (with I. Jauslin) Random translation-invariant Hamiltonians and their spectral gaps, Quantum 6, 790 (2022)  arXiv   Article
    9. (with J. Faupin and I.M. Sigal) Maximal speed for macroscopic particle transport in the Bose-Hubbard model, Phys. Rev. Lett. 128 (2022), 150602   arXiv   Article
    10. (with J. Faupin and I.M. Sigal) On Lieb-Robinson bounds for the Bose-Hubbard model, Commun. Math. Phys. 394 (2022), 1011–1037  arXiv   Article
    11. (with M. Keller) Asymptotic expansion of the annealed Green's function and its derivatives, to appear in Math. Res. Lett.   arXiv
    12. (with M. Keller) Optimal Hardy weights for the Euclidean lattice, Trans. Amer. Math. Soc. 376 (2023), 6033-6062   arXiv   Article
    13. (with A. Adhikari) Local Law for Singular Values of Oscillatory Matrices, Int. Math. Res. Not. 2023 (2023), no. 5, 3907-3947   arXiv   Article
    14. (with D. Sutter) Quantitative lower bounds on the Lyapunov exponent from multivariate matrix inequalities, Anal. Math. Phys. 12 (2022), 5   arXiv   Article
    15. (with A.W. Sandvik and L. Wang) Existence of a Spectral Gap in the Affleck-Kennedy-Lieb-Tasaki Model on the Hexagonal Lattice, Phys. Rev. Lett. 124 (2020), 177204   arXiv   Article
    16. (with P.M. Kielstra) On the finite-size Lyapunov exponent for the Schrödinger operator with skew-shift potential, Comm. Math. Sci.   18 (2020), no. 5, 1305-1314   arXiv   Article
    17. (with A.W. Sandvik and S. Yang) The AKLT model on a hexagonal chain is gapped, J. Stat. Phys. 177 (2019), no. 6, 1077-1088   arXiv   Article
    18. (with A. Adhikari and H.-T. Yau) Global eigenvalue distribution of matrices defined by the skew-shift, Anal. PDE 14 (2021), no. 4, 1153 - 1198   arXiv   Article
    19. (with M. de Courcy-Ireland) A central limit theorem for integrals of random waves, J. Reine Angew. Math. (Crelle), 785 (2022), 1–30   arXiv   Article
    20. Gaplessness is not generic for translation-invariant spin chains, Phys. Rev. B 100 (2019) 035113   arXiv   Article
    21. (with B. Nachtergaele) Gapped PVBS models for all species numbers and dimensions, Rev. Math. Phys. 31 (2019), no. 9, 1950028   arXiv   Article
    22. (with H. Abdul-Rahman, A. Lucia, B. Nachtergaele and A. Young) A class of two-dimensional AKLT models with a gap, Analytic trends in mathematical physics, Contemp. Math. 741, Amer. Math. Soc., Providence, RI 2020   arXiv   Article
    23. Finite-size criteria for spectral gaps in D-dimensional quantum spin systems, Analytic trends in mathematical physics, Contemp. Math. 741, Amer. Math. Soc., Providence, RI 2020   arXiv   Article
    24. (with M. Duerinckx and A. Gloria) A remark on a surprising result by Bourgain in homogenization, Comm. Part. Diff. Eq. 44 (2019), no. 12, 1345-1357   arXiv   Article
    25. (with R. Han and W. Schlag) Weyl sums and the Lyapunov exponent for the skew-shift Schrödinger cocycle, J. Spectr. Theory 10 (2020), no. 4, 1139-1172.  arXiv   Article  
    26. (with J. Kim) On the averaged Green's function of an elliptic equation with random coefficients, Arch. Ration. Mech. Anal. 234 (2019), no. 3, 1121-1166   arXiv   Article
    27. (with R. Han and W. Schlag) Effective multi-scale approach to the Schrödinger cocycle over a skew shift base, Ergod. Theory Dyn. Syst. 40 (2020), no. 10, 2788-2853  arXiv   Article
    28. (with E. Mozgunov) Spectral gaps of frustration-free spin systems with boundary, J. Math. Phys. 60 (2019) 051901   arXiv   Article
    29. On multivariate trace inequalities of Sutter, Berta and Tomamichel, J. Math. Phys. 59 (2018) 012204   arXiv   Article
    30. Entropic relations for indistinguishable quantum particles J. Stat. Mech. (2024) 043101 arXiv   Article
    31. (with P. Plucinsky and K. Bhattacharya) Actuation of thin nematic elastomer sheets with controlled heterogeneity, Arch. Ration. Mech. Anal. 227 (2018), no. 1, 149-214   arXiv   Article
    32. (with M.M. Wilde) Information-theoretic limitations on approximate quantum cloning and broadcasting, Phys. Rev. A 96 (2017) 012304   arXiv   Article
    33. (with R.L. Frank and B. Simon) Condensation of fermion pairs in a domain, Calc. Var. Partial Differential Equations 56 (2017), no. 2, 54,   arXiv   Article
    34. (with P. Plucinsky and K. Bhattacharya) Programming complex shapes in thin nematic elastomer and glass sheets, Phys. Rev. E 94 (2016) 010701(R), rapid communication   arXiv   Article
    35. On the Hölder regularity for the fractional Schrödinger equation and its improvement for radial data, Comm. Part. Diff. Eq. 41 (2016), no. 11, 1761-1792   arXiv   Article
    36. (with M. Gebert) On polynomial Lieb-Robinson bounds for the XY chain in a decaying random field, J. Stat. Phys. 164 (2016), no. 3, 667-679   arXiv   Article
    37. (with V. Markovic) Heat flows on hyperbolic spaces, J. Diff. Geom. 108 (2018), no. 3, 495 - 529   arXiv   Article
    38. (with R.L. Frank) Multi-Component Ginzburg-Landau Theory: Microscopic Derivation and Examples, Ann. Henri Poincaré 17 (2016), no. 9, 2285-2340   arXiv   Article
    39. (with M. Berta and M.M. Wilde) Monotonicity of quantum relative entropy and recoverability, Q. Inf. Comp. 15 (2015), no. 15 & 16, 1333-1354   arXiv   Article
    40. (with D. Damanik, M. Lukic and W. Yessen) New Anomalous Lieb-Robinson Bounds in Quasi-Periodic XY Chains, Phys. Rev. Lett. 113 (2014), 127202   arXiv   Article
    41. (with D. Damanik, M. Lukic and W. Yessen) On Anomalous Lieb-Robinson Bounds for the Fibonacci XY Chain, J. Spectr. Theory 6 (2016), no. 8, 601-628   arXiv   Article
    42. New counterexamples for sums-differences, Proc. Amer. Math. Soc. 143 (2015), no. 9, 3863-3868   arXiv   Article

    Links

    International Association of Mathematical Physics (IAMP)

    Association of Women in Mathematical Physics (AWMP)

    Google scholar profile

    Last update: December 19, 2024