Dr. Tim Langen
5. Physikalisches Institut and Center for Integrated Quantum Science and Technology
Universität Stuttgart
Pfaffenwaldring 57, 70569 Stuttgart, Germany
Phone: +49-711-685-60149

About me

I am a group leader at the 5th Institute of Physics of the University of Stuttgart.

Before that, I was a Feodor Lynen postdoctoral fellow in Jun Ye's group at JILA in Boulder, and a CoQuS PhD fellow in Jörg Schmiedmayer’s group at the Atominstitut and the Vienna Center for Quantum Science and Technology. During my PhD, I have also been a visiting researcher in Christophe Salomon’s group at École Normale Supérieure in Paris. As an undergraduate, I studied physics in Mainz and Marseille and carried out my diploma work in Herwig Ott’s group at Johannes Gutenberg-University in Mainz.

There are currently positions for Bachelor/Master and PhD students available in my lab, which is funded by an ERC Starting Grant. Please visit www.coldmolecules.de for details.


Density Fluctuations across the Superfluid-Supersolid Phase Transition in a Dipolar Quantum Gas
J. Hertkorn, J.-N. Schmidt, F. Böttcher, M. Guo, M. Schmidt, K.S.H. Ng, S.D. Graham, H.P. Büchler, T. Langen, M. Zwierlein, T. Pfau
Beyond the Limits of Conventional Stark Deceleration
D. Reens, H. Wu, A. Aeppli, A. McAuliffe, P. Wcislo, T. Langen, and J. Ye
Phys. Rev. Research 2, 033095 (2020), arxiv:2004.01856
Buffer-gas cooling, high-resolution spectroscopy, and optical cycling
of barium monofluoride molecules

R. Albrecht, M. Scharwaechter, T. Sixt, L. Hofer, and T. Langen
Phys. Rev. A 101, 013413 (2020), arxiv:1906.08798
Dilute dipolar quantum droplets beyond the extended Gross-Pitaevskii equation
F. Böttcher, M. Wenzel, J.-N. Schmidt, M. Guo, T. Langen, I. Ferrier-Barbut, T. Pfau, R. Bombin, J. Sanchez-Baena, J. Boronat, and F. Mazzanti
Phys. Rev. Research 1, 033088 (2019), arxiv:1904.10349
Fate of the Amplitude Mode in a Trapped Dipolar Supersolid
J. Hertkorn, F. Böttcher, M. Guo, J.-N. Schmidt, T. Langen, H. P. Büchler, and T. Pfau
Phys. Rev. Lett. 123, 193002 (2019), arxiv:1907.09315
The low-energy Goldstone mode in a trapped dipolar supersolid
M. Guo, F. Böttcher, J. Hertkorn, J.-N. Schmidt, M. Wenzel, H.P. Büchler, T. Langen, and T. Pfau
Nature 574, 386–389 (2019), arxiv:1906.04633
see also Press release, Pressemitteilung, Nature News & Views, Nature Physics Research Highlights, Welt der Physik, Deutschlandfunk, Clixoom, Forschung und Wissen
Optimal control of the self-bound dipolar droplet formation process
J.-F. Mennemann, T. Langen, L. Exl, and N. J. Mauser
Comput. Phys. Commun. 244, 205 (2019), arxiv:1905.12546
Transient supersolid properties in an array of dipolar quantum droplets
F. Böttcher, J.-N. Schmidt, M. Wenzel, J. Hertkorn, M. Guo, T. Langen, and T. Pfau
Phys. Rev. X 9, 011051 (2019), arxiv:1901.07982
see also APS Physics Highlights 2019, Nature News & Views, Physics Viewpoint, Physik Journal, Physics World

For this and other works I have been awarded the Rudolf Kaiser Prize 2019
Anisotropic Superfluid Behavior of a Dipolar Bose-Einstein Condensate
M. Wenzel, F. Böttcher, J.-N. Schmidt, M. Eisenmann, T. Langen, T. Pfau, and I. Ferrier-Barbut
Phys. Rev. Lett. 121, 030401 (2018), arxiv:1804.04552
Enhancing radical molecular beams by skimmer cooling
H. Wu, D. Reens, T. Langen, Y. Shagam, D. Fontecha, and J. Ye
Phys. Chem. Chem. Phys. 20, 11615 (2018), arxiv:1802.10179
Scissors mode of dipolar quantum droplets
I. Ferrier-Barbut, M. Wenzel, F. Böttcher, T. Langen, M. Isoard, S. Stringari, and T. Pfau
Phys. Rev. Lett. 120, 160402 (2018), arxiv:1712.06927
see also Physics Today
Double light-cone dynamics establish thermal states in integrable 1D Bose gases
T. Langen, T. Schweigler, E. Demler, and J. Schmiedmayer
New J. Phys. 20, 023034 (2018), arxiv:1709.05994
Controlling spin flips of molecules in an electromagnetic trap
D.L. Reens, H. Wu, T. Langen, and J. Ye
Phys. Rev. A 96, 063420 (2017), arxiv:1706.02806
Striped states in a many-body system of tilted dipoles
M. Wenzel, F. Böttcher, T. Langen, I. Ferrier-Barbut, and T. Pfau
Phys. Rev. A 96, 053630 (2017), arxiv:1706.09388
Experimental characterization of a quantum many-body system via higher-order correlations
T. Schweigler, V. Kasper, S. Erne, I. Mazets, B. Rauer, F. Cataldini, T. Langen,
T. Gasenzer, J. Berges, and J. Schmiedmayer
Nature 545, 323–326 (2017), arxiv:1505.03126
see also Nature Physics News & Views, Press release (english/deutsch)
Dissipative cooling of degenerate Bose gases
P. Grišins, B. Rauer, T. Langen, J. Schmiedmayer, and I. Mazets
Phys. Rev. A 93, 033634 (2016), arxiv:1411.4946
Cooling of a one-dimensional Bose gas
B. Rauer, P. Grišins, I.E. Mazets, T. Schweigler, W. Rohringer, R. Geiger, T. Langen,
and J. Schmiedmayer
Phys. Rev. Lett. 116, 030402 (2016), arxiv:1505.04747
see also Press release (english/deutsch), der Standard
Optimal control of Bose-Einstein condensates in three dimensions
J.F. Mennemann, D. Matthes, R.M. Weishäupl, and T. Langen
New J. Phys. 17, 113027 (2015), arxiv:1507.07319
see also Video summary
Towards experimental quantum field tomography with ultracold atoms
A. Steffens, M. Friesdorf, T. Langen, B. Rauer, T. Schweigler, R. Hübener,
J. Schmiedmayer, C. A. Riofrio, and J. Eisert
Nature Communications 6, 7663 (2015), arxiv:1406.3632
see also Press release (english/deutsch), ORF, die Presse
Experimental observation of a generalized Gibbs ensemble
T. Langen, S. Erne, R. Geiger, B. Rauer, T. Schweigler, M. Kuhnert, W. Rohringer,
I. E. Mazets, T. Gasenzer, and J. Schmiedmayer
Science 348, 207 (2015), arXiv:1411.7185
see also Science Perspective, Press release (english/deutsch), ORF, die Presse, APA Meldung, openscienceworld

For this and other works I have been awarded the Runner-up 2017 New Journal of Physics Early Career Award
Chiral prethermalization in supersonically split condensates
K. Agarwal, E. G. Dalla Torre, B. Rauer, T. Langen, J. Schmiedmayer, and E. Demler
Phys. Rev. Lett. 113, 190401 (2014), arxiv:1402.6716
Local relaxation and light-cone-like propagation of correlations in a trapped 1D Bose gas
R. Geiger, T. Langen, I. Mazets, and J. Schmiedmayer
New J. Phys. 16, 053034 (2014), arXiv:1312.7568
Comment on ‘‘Probing phase fluctuations in a 2D degenerate Bose gas by free expansion’’
T. Langen
Phys. Rev. Lett. 111, 159601 (2013)
see also Choi et al., PRL 109, 125301 (2012) and PRL 111, 159602 (2013)

Local emergence of thermal correlations in an isolated quantum many-body system
T. Langen, R. Geiger, M. Kuhnert, B. Rauer, and J. Schmiedmayer
Nature Physics 9, 640–643 (2013), arxiv:1305.3708
see also Nature Physics News & Views, Press release (english/deutsch), Physics Today, APA Meldung, die Presse
Prethermalization revealed by the relaxation dynamics of full distribution functions
D. Adu Smith, M. Gring, T. Langen, M. Kuhnert, B. Rauer, R. Geiger, T. Kitagawa, I. Mazets,
E. Demler, and J. Schmiedmayer
New J. Phys. 15, 075011 (2013), arXiv:1212.4645

Lifetime of the Bose gas with resonant interactions
B. S. Rem, A. T. Grier, I. Ferrier-Barbut, U. Eismann, T. Langen, N. Navon, L. Khaykovich, F. Werner, D. S. Petrov, F. Chevy, and C. Salomon
Phys. Rev. Lett. 110, 163202 (2013), arXiv:1212.5274
Multimode dynamics and emergence of a characteristic length-scale in a one-dimensional quantum system
M. Kuhnert, R. Geiger, T. Langen, M. Gring, B. Rauer, T. Kitagawa, E. Demler, D. Adu Smith, and J. Schmiedmayer
Phys. Rev. Lett. 110, 090405 (2013), arXiv:1211.5323
see also Press release (english/deutsch)
Relaxation and prethermalization in an isolated quantum system
M. Gring, M. Kuhnert, T. Langen, T. Kitagawa, B. Rauer, M. Schreitl, I. Mazets, D. Adu Smith,
E. Demler, and J. Schmiedmayer
Science 337, 1318 (2012), arXiv:1112.0013
see also derStandard – Best of Wissenschaft 2012, Press release (english,deutsch)
PRL 104 cover
Experimental demonstration of single-site addressability in a two-dimensional optical lattice
P. Würtz, T. Langen, T. Gericke, A. Koglbauer, and H. Ott
Phys. Rev. Lett. 103, 080404 (2009), arXiv:0903.4837
see also PRL cover, Nature Photonics Research Highlights, Physicsworld, Physics Synopsis
High resolution scanning electron microscopy of an ultracold quantum gas
T. Gericke, P. Würtz, D. Reitz, T. Langen, and H. Ott
Nature Physics 4, 949 – 953 (2008)
see also Nature Physics News & Views, Press release (english/deutsch), Optics and Photonics Focus, Physik Journal


New states of matter with fine-tuned interactions:
quantum droplets and dipolar supersolids
F. Boettcher, J.-N. Schmidt, J. Hertkorn, K. Ng, S. D. Graham, M. Guo, T. Langen, and T. Pfau
Ultrakalt Magnetisiert
T. Langen and Manfred J. Mark
Physik Journal 17, 35 (2018)
Quenches, Relaxation, and Prethermalization in an Isolated Quantum System
T. Langen and J. Schmiedmayer
in Universal Themes of Bose-Einstein Condensation, Cambridge University Press (2017)
Prethermalization and universal dynamics in near-integrable quantum systems
T. Langen, T. Gasenzer, and J. Schmiedmayer
J. Stat. Mech. 064009 (2016), arxiv:1603.09385
Ultracold atoms out of equilibrium
T. Langen, R. Geiger, and J. Schmiedmayer
Annu. Rev. Cond. Mat. Phys. 6, 201 (2015), arxiv:1408.6377
Interferometry with Atoms
J. F. Schaff, T. Langen, and J. Schmiedmayer
Proc. Internat. School Phys. Enrico Fermi, 188, 1 (2014), arxiv:1504.04285
also published as Riv. Nuovo Cimento 34, 509 (2014)


Non-equilibrium dynamics of one-dimensional Bose gases
T. Langen
PhD Thesis, Technical University of Vienna, Austria (2013)
awarded with European Physical Society QEOD thesis prize and Springer Thesis Prize
see also CLEO, Press release (english/deutsch)
Addressing of ultracold atoms in optical lattices
T. Langen
Diplomarbeit, Johannes Gutenberg-Universität Mainz, Germany (2008)


Does an isolated quantum system relax?
B. Rauer, T. Schweigler, T. Langen, and J. Schmiedmayer
Proc. Int. School Phys. Enrico Fermi 191, 485 (2016), arxiv:1504.04288
Studying non-equilibrium many-body dynamics using one-dimensional Bose gases
T. Langen, M. Gring, M. Kuhnert, B. Rauer, R. Geiger, I. Mazets, D. Adu Smith, T. Kitagawa, E. Demler, and J. Schmiedmayer
AIP Conf. Proc. 1633, 11 (2014)
Prethermalization in one-dimensional Bose gases: description by a stochastic Ornstein-Uhlenbeck process
T. Langen, M. Gring, M. Kuhnert, B. Rauer, R. Geiger, D. Adu Smith, I. E. Mazets, and J. Schmiedmayer
Eur. Phys. J. Special Topics 217, 43 (2013), arXiv:1211.0016
Probing Bose-Einstein condensates by electron impact ionization
P. Würtz, T. Gericke, T. Langen, A. Koglbauer, and H. Ott
Journal of Physics: Conf. Ser. 141, 012020 (2008)

Selected videos

Dipolar gases: From supersolid atoms to cold molecules, Stuttgart (2020)
Non-equilibrium dynamics of one-dimensional Bose gases, New York City (2014)
Quantum physics using atom chips, Vienna (2010)