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- Publications
- Influence

Visualization of branch points in PT-symmetric waveguides.

- Shachar Klaiman, U. Günther, N. Moiseyev
- Physics, Medicine
- Physical review letters
- 18 February 2008

The visualization of an exceptional point in a PT-symmetric directional coupler (DC) is demonstrated. In such a system the exceptional point can be probed by varying only a single parameter. Using… Expand

Evaluation of stable isotope fingerprinting techniques for the assessment of the predominant methanogenic pathways in anaerobic digesters

- M. Nikolausz, R. H. Walter, +6 authors H. H. Richnow
- Biology, Medicine
- Applied Microbiology and Biotechnology
- 10 January 2013

Laboratory biogas reactors were operated under various conditions using maize silage, chicken manure, or distillers grains as substrate. In addition to the standard process parameters, the hydrogen… Expand

Exact propagators for SUSY partners

- A. Pupasov, B. F. Samsonov, U. Günther
- Physics, Mathematics
- 26 February 2007

Pairs of SUSY partner Hamiltonians are studied which are interrelated by usual (linear) or polynomial supersymmetry. Assuming the model of one of the Hamiltonians as exactly solvable with a known… Expand

PT symmetry and spontaneous symmetry breaking in a microwave billiard.

- S. Bittner, B. Dietz, +4 authors F. Schäfer
- Physics, Mathematics
- Physical review letters
- 21 July 2011

We demonstrate the presence of parity-time (PT) symmetry for the non-Hermitian two-state Hamiltonian of a dissipative microwave billiard in the vicinity of an exceptional point (EP). The shape of the… Expand

A non-Hermitian $PT-$symmetric Bose-Hubbard model: eigenvalue rings from unfolding higher-order exceptional points

- E. Graefe, U. Günther, H. J. Korsch, A. Niederle
- Physics, Mathematics
- 21 February 2008

We study a non-Hermitian $PT-$symmetric generalization of an $N$-particle, two-mode Bose-Hubbard system, modeling for example a Bose-Einstein condensate in a double well potential coupled to a… Expand

Naimark-dilated PT-symmetric brachistochrone.

- U. Günther, Boris F. Samsonov
- Physics, Mathematics
- Physical review letters
- 23 July 2008

The quantum mechanical brachistochrone system with a PT-symmetric Hamiltonian is Naimark-dilated and reinterpreted as a subsystem of a Hermitian system in a higher-dimensional Hilbert space. This… Expand

Quantum physics with non-Hermitian operators

- C. Bender, A. Fring, U. Günther, H. F. Jones
- Physics
- 9 November 2012

The main motivation behind the call for this special issue was to gather recent results, developments and open problems in quantum physics with non-Hermitian operators. There have been previous… Expand

Serum ferritin iron in iron overload and liver damage: correlation to body iron stores and diagnostic relevance.

- P. Nielsen, U. Günther, M. Duerken, R. Fischer, J. Düllmann
- Medicine, Chemistry
- The Journal of laboratory and clinical medicine
- 1 May 2000

The iron content of serum ferritin has been determined in groups of patients with normal or increased iron stores by using a technique of ferritin immunoprecipitation followed by iron quantitation… Expand

Bypassing the bandwidth theorem with PT symmetry

- H. Ramezani, J. Schindler, +9 authors Germany
- Physics
- 9 May 2012

The beat time ${\ensuremath{\tau}}_{\mathrm{fpt}}$ associated with the energy transfer between two coupled oscillators is dictated by the bandwidth theorem which sets a lower bound… Expand

J-self-adjoint operators with C-symmetries : an extension theory approach

- S. Albeverio, U. Günther, S. Kuzhel
- 2009

A well-known tool in conventional (von Neumann) quantum mechanics is the self-adjoint extension technique for symmetric operators. It is used, e.g., for the construction of Dirac–Hermitian… Expand

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