Interests
My research is in theoretical physics, and currently focuses on the behaviour of quantum-mechanical systems made up from lots of strongly interacting particles. Ordinarily one finds standard thermal behaviour. But, if the system is well-isolated from the environment, there is another possibility: the system may be many-body localised (MBL). Quantum systems in the MBL phase evade standard thermalisation.
Before that I worked on frustrated magnets. These systems have many low energy states, a fact with strong implications for the dynamics at low temperatures. Back further still, I worked with an experimental group researching ultracold quantum gases.
Biography
I am working toward my DPhil in the Rudolf Peierls Centre for Theoretical Physics [2017-21]. Before that I studied Natural Sciences at the University of Cambridge, where I obtained a BA and MSci [2013-17]. I have been tutoring undergraduates in Physics at St. Hugh’s since 2018, and have held a stipendiary lectureship here since 2019.
Publications
S. J. Garratt, J. T. Chalker. Many-body delocalisation as symmetry breaking. arXiv:2012.11580.
S. J. Garratt, J. T. Chalker. Local pairing of Feynman histories in many-body Floquet models. arXiv:2008.01697
J. Zhang, C. Eigen, W. Zheng, J. A. P. Glidden, T. A. Hilker, S. J. Garratt, R. Lopes, N. R. Cooper, Z. Hadzibabic, N. Navon. Many-body decay of the gapped lowest excitation of a Bose-Einstein condensate. Phys. Rev. Lett. 126, 060402 [2021]
S. J. Garratt, J. T. Chalker. Goldstone modes in the emergent gauge fields of a frustrated magnet. Phys. Rev. B 101, 024413 [2020]
S. J. Garratt, C. Eigen, J. Zhang, P. Turzák, R. Lopes, R. P. Smith, Z. Hadzibabic, N. Navon. From single-particle excitations to sound waves in a box-trapped atomic Bose-Einstein condensate. Phys. Rev. A 99, 021601(R) [2019]
J. Garratt, C. Eigen, J. Zhang, P. Turzák, R. Lopes, R. P. Smith, Z. Hadzibabic, N. Navon. From single-particle excitations to sound waves in a box-trapped atomic Bose-Einstein condensate. Phys. Rev. A 99, 021601(R) [2019]
