Imperial College London


Faculty of Natural SciencesDepartment of Mathematics

Royal Society University Research Fellow (Reader)



+44 (0)20 7594 8549e.graefe CV




6M12Huxley BuildingSouth Kensington Campus





I am a Royal Society University Research Fellow and proleptic Reader in the Mathematical Physics Group. My research background is in theoretical quantum physics in the context of atomic physics, and in particular the description of ultracold atoms and Bose-Einstein condensates.

My research group is working on theoretical quantum dynamics. We are investigating quantum-classical correspondence of open quantum systems described by non-Hermitian (and often PT-symmetric) Hamiltonians or Lindblad equations. We aim to develop a semiclassical framework for these theories and understand the quantum signatures of chaos. Some of us are also interested in quantum transition rate theories. We like to think our ideas are useful in cold atoms, optics, materials, and other applications.

Group photo on Queens lawn

Group Photo September 2019

Group Photo March 2019

Group Photo March 2019

group photo September 2018

Group photo - September 2018

Selected Publications

Journal Articles

Graefe E-M, Malzard S, Melanathuru VR, 2022, Landau-Zener transitions through a pair of higher order exceptional points, Physical Review A, ISSN:1050-2947

Graefe EM, Korsch HJ, Rush A, 2016, Quasiclassical analysis of Bloch oscillations in non-Hermitian tight-binding lattices, New Journal of Physics, Vol:18, ISSN:1367-2630

Graefe E-M, Rush A, Schubert R, 2016, Propagation of Gaussian beams in the presence of gain and loss, Ieee Journal of Selected Topics in Quantum Electronics, Vol:22, ISSN:1558-4542

Graefe E-M, Mudute-Ndumbe S, Taylor M, 2015, Random matrix ensembles for PT-symmetric systems, Journal of Physics A - Mathematical and Theoretical, Vol:48, ISSN:1751-8113

Graefe E-M, Graney M, Rush A, 2015, Semiclassical quantization for a bosonic atom-molecule conversion system, Physical Review A: General Physics, Vol:92, ISSN:0556-2791

Graefe E-M, Korsch HJ, Rush A, et al., 2014, Classical and quantum dynamics in the (non-Hermitian) Swanson oscillator, Journal of Physics A-mathematical and General, ISSN:1361-6447

Graefe E-M, Mailybaev AA, Moiseyev N, 2013, Breakdown of adiabatic transfer of light in waveguides in the presence of absorption, Physical Review A, Vol:88, ISSN:1050-2947

Graefe EM, 2013, Viewpoint: Quantum Chaos on Display, Physics 6, 9, Vol:6

Brody DC, Graefe E-M, 2012, Mixed-State Evolution in the Presence of Gain and Loss, Physical Review Letters, Vol:109, ISSN:0031-9007

Graefe E-M, 2012, Stationary states of a PT symmetric two-mode Bose-Einstein condensate, Journal of Physics A - Mathematical and Theoretical, Vol:45, ISSN:1751-8113

Demange G, Graefe E-M, 2012, Signatures of three coalescing eigenfunctions, Journal of Physics A - Mathematical and Theoretical, Vol:45, ISSN:1751-8113

Brody DC, Graefe E-M, 2011, Six-dimensional space-time from quaternionic quantum mechanics, Physical Review D, Vol:84, ISSN:1550-7998

Graefe E-M, Jones HF, 2011, PT-symmetric sinusoidal optical lattices at the symmetry-breaking threshold, Physical Review A, Vol:84, ISSN:1050-2947

Graefe E-M, Schubert R, 2011, Wave-packet evolution in non-Hermitian quantum systems, Physical Review A, Vol:83, ISSN:1050-2947

Graefe E, Korsch HJ, Niederle AE, 2010, Quantum Classical Correspondence for a non-Hermitian Bose-Hubbard Dimer, Phys. Rev. A, Vol:82

Graefe EM, Korsch HJ, Niederle AE, 2008, Mean-Field Dynamics of a Non-Hermitian Bose-Hubbard Dimer, Physical Review Letters, Vol:101, ISSN:0031-9007

Graefe EM, Korsch HJ, 2007, Semiclassical quantization of an N-particle Bose-Hubbard model, Physical Review A, Vol:76, ISSN:1050-2947

Witthaut D, Graefe EM, Korsch HJ, 2006, Towards a generalized Landau-Zener formula for an interacting Bose-Einstein condensate in a two-level system, Physical Review A, Vol:73, ISSN:1050-2947

Graefe EM, Korsch HJ, Witthaut D, 2006, Mean-field dynamics of a Bose-Einstein condensate in a time-dependent triple-well trap: Nonlinear eigenstates, Landau-Zener models, and stimulated Raman adiabatic passage, Physical Review A, Vol:73, ISSN:1050-2947

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