Thomas Gasenzer

Heidelberg University

Time evolutionEffective actionMagnetic fieldPhysicsStatistical physicsVortexAtomic physicsBose gasSuperfluidityCondensed matter physicsParity (physics)Thermal equilibriumQuantum electrodynamicsQuantum statistical mechanicsBose–Einstein condensateFixed pointQuantum mechanicsClassical mechanicsQuantumScaling

126Publications

28H-index

2,609Citations

Publications 104

Newest

#1Paul WittmerH-Index: 2

#2Christian-Marcel SchmiedH-Index: 7

Last. Carlo EwerzH-Index: 20

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Holographic duality provides a description of strongly coupled quantum systems in terms of weakly coupled gravitational theories in a higher-dimensional space. It is a challenge, however, to quantitatively determine the physical parameters of the quantum systems corresponding to generic holographic theories. Here, we address this problem for the two-dimensional holographic superfluid, known to exhibit strong dissipation. We numerically simulate the motion of a vortex dipole and perform a high-pr...

#1Lukas KadesH-Index: 3

#2Martin GärttnerH-Index: 18

Last. Jan M. PawlowskiH-Index: 38

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Path integrals with complex actions are encountered for many physical systems ranging from spin- or mass-imbalanced atomic gases and graphene to quantum chromo-dynamics at finite density to the non-equilibrium evolution of quantum systems. Many computational approaches have been developed for tackling the sign problem emerging for complex actions. Among these, complex Langevin dynamics has the appeal of general applicability. One of its key challenges is the potential convergence of the dynamics...

#1Stefanie Czischek (UW: University of Waterloo)H-Index: 4

#2Andreas BaumbachH-Index: 8

Last. Martin GärttnerH-Index: 18

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Neuromorphic systems are designed to emulate certain structural and dynamical properties of biological neuronal networks, with the aim of inheriting the brain's functional performance and energy efficiency in artificial-intelligence applications [1,2]. Among the platforms existing today, the spike-based BrainScaleS system stands out by realizing fast analog dynamics which can boost computationally expensive tasks [3]. Here we use the latest BrainScaleS generation [4] for the algorithm-free simul...

#1Stefan LannigH-Index: 4

#2Christian-Marcel SchmiedH-Index: 7

Last. Markus K. OberthalerH-Index: 59

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Ultracold gases provide an unprecedented level of control for the investigation of soliton dynamics and collisions. We present a scheme for deterministically preparing pairs of three-component solitons in a Bose-Einstein condensate. Our method is based on local spin rotations which simultaneously imprint suitable phase and density distributions. This enables us to observe striking collisional properties of the vector degree of freedom which naturally arises for the coherent nature of the emergin...

#1Ben Freivogel (UvA: University of Amsterdam)H-Index: 19

#2Thomas Gasenzer (Heidelberg University)H-Index: 28

Last. Sascha Leonhardt (Heidelberg University)H-Index: 4

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We conjecture that, in a renormalizable effective quantum field theory where the heaviest stable particle has mass m, there are no bound states with radius below 1/m (Bound State Conjecture). We are motivated by the (scalar) Weak Gravity Conjecture, which can be read as a statement forbidding certain bound states. As we discuss, versions for uncharged particles and their generalizations have shortcomings. This leads us to the suggestion that one should only constrain rather than exclude bound ob...

#1C.-M. Schmied (UMass: University of Massachusetts Amherst)H-Index: 1

#2Thomas Gasenzer (Heidelberg University)H-Index: 28

Last. Panayotis G. Kevrekidis (UMass: University of Massachusetts Amherst)H-Index: 63

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In this work we study the stability properties of the ground states of a spin-1 Bose gas in presence of a trapping potential in one spatial dimension. To set the stage we first map out the phase diagram for the trapped system by making use of a, so-called, continuous-time Nesterov method. We present an extension of the method, which has been previously applied to one-component systems, to our multi-component system. We show that it is a powerful and robust tool for finding the ground states of a...

#1Stefanie CzischekH-Index: 4

#2Jan M. Pawlowski (Heidelberg University)H-Index: 4

Last. Martin GärttnerH-Index: 18

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Due to the complexity of the space of quantum many-body states the computation of expectation values by statistical sampling is, in general, a hard task. Neural network representations of such quantum states which can be physically implemented by neuromorphic hardware could enable efficient sampling. A scheme is proposed which leverages this capability to speed up sampling from so-called neural quantum states encoded by a restricted Boltzmann machine. Due to the complex network parameters a dire...

#1Christian-Marcel Schmied (Heidelberg University)H-Index: 7

#2Aleksandr N. Mikheev (Heidelberg University)H-Index: 3

Last. Thomas Gasenzer (Heidelberg University)H-Index: 28

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In this article we give an overview of the concept of universal dynamics near non-thermal fixed points in isolated quantum many-body systems. We outline a non-perturbative kinetic theory derived wi...

#1Christian-Marcel Schmied (University of Otago)H-Index: 7

#2Thomas GasenzerH-Index: 28

Last. P. B. Blakie (University of Otago)H-Index: 27

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We consider the phase ordering dynamics of an isolated quasi-two-dimensional spin-1 Bose gas quenched into an easy-plane ferromagnetic phase. Preparing the initial system in an unmagnetized anti-ferromagnetic state the subsequent ordering involves both polar core and Mermin-Ho spin vortices, with the ratio between the different vortices controllable by the quench parameter. Ferromagnetic domain growth occurs as these vortices annihilate. The distinct dynamics of the two types of vortices means t...

#1Aleksandr N. MikheevH-Index: 3

#2Christian-Marcel SchmiedH-Index: 7

Last. Thomas GasenzerH-Index: 28

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Non-thermal fixed points in the evolution of a quantum many-body system quenched far out of equilibrium manifest themselves in a scaling evolution of correlations in space and time. We develop a low-energy effective theory of non-thermal fixed points in a bosonic quantum many-body system by integrating out long-wave-length density fluctuations. The system consists of Ndistinguishable spatially uniform Bose gases with U(N)symmetric interactions. The effective theory describes interacting Go...

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