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Bose–Einstein Condensation in a Dilute, Trapped Gas at Positive Temperature

- A. Deuchert, R. Seiringer, J. Yngvason
- Physics, Mathematics
- 14 March 2018

We consider an interacting, dilute Bose gas trapped in a harmonic potential at a positive temperature. The system is analyzed in a combination of a thermodynamic and a Gross–Pitaevskii (GP) limit… Expand

Emergence of Non-Abelian Magnetic Monopoles in a Quantum Impurity Problem.

- E. Yakaboylu, A. Deuchert, M. Lemeshko
- Physics, Medicine
- Physical review letters
- 15 May 2017

Recently, it was shown that molecules rotating in superfluid helium can be described in terms of the angulon quasiparticles [Phys. Rev. Lett. 118, 095301… Expand

Theory of the rotating polaron: Spectrum and self-localization

- E. Yakaboylu, Bikashkali Midya, A. Deuchert, N. Leopold, M. Lemeshko
- Physics
- 4 September 2018

We study a quantum impurity possessing both translational and internal rotational degrees of freedom interacting with a bosonic bath. Such a system corresponds to a “rotating polaron,” which can be… Expand

Persistence of Translational Symmetry in the BCS Model with Radial Pair Interaction

- A. Deuchert, Alissa Geisinger, C. Hainzl, M. Loss
- Physics, Mathematics
- 10 December 2016

We consider the two-dimensional BCS functional with a radial pair interaction. We show that the translational symmetry is not broken in a certain temperature interval below the critical temperature.… Expand

Gross–Pitaevskii Limit of a Homogeneous Bose Gas at Positive Temperature

- A. Deuchert, R. Seiringer
- Physics, Mathematics
- 31 January 2019

We consider a dilute, homogeneous Bose gas at positive temperature. The system is investigated in the Gross–Pitaevskii limit, where the scattering length a is so small that the interaction energy is… Expand

Dynamics and symmetries of a repulsively bound atom pair in an infinite optical lattice

- A. Deuchert, K. Sakmann, A. Streltsov, O. Alon, L. Cederbaum
- Physics
- 18 February 2012

We investigate the dynamics of two bosons trapped in an infinite one-dimensional optical lattice potential within the framework of the Bose-Hubbard model and derive an exact expression for the… Expand

Note on a Family of Monotone Quantum Relative Entropies

- A. Deuchert, C. Hainzl, R. Seiringer
- Mathematics, Physics
- 25 February 2015

Given a convex function $${\varphi}$$φ and two hermitian matrices A and B, Lewin and Sabin study in (Lett Math Phys 104:691–705, 2014) the relative entropy defined by $${\mathcal{H}(A,B)={\rm Tr}… Expand

Intermolecular forces and correlations mediated by a phonon bath.

- X. Li, E. Yakaboylu, G. Bighin, R. Schmidt, M. Lemeshko, A. Deuchert
- Physics, Medicine
- The Journal of chemical physics
- 5 December 2019

Inspired by the possibility to experimentally manipulate and enhance chemical reactivity in helium nanodroplets, we investigate the effective interaction and the resulting correlations between two… Expand

THE FREE ENERGY OF THE TWO-DIMENSIONAL DILUTE BOSE GAS. I. LOWER BOUND

- A. Deuchert, S. Mayer, R. Seiringer
- Physics, Mathematics
- Forum of Mathematics, Sigma
- 8 October 2019

We prove a lower bound for the free energy (per unit volume) of the two-dimensional Bose gas in the thermodynamic limit. We show that the free energy at density $\unicode[STIX]{x1D70C}$ and inverse… Expand

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