81 citations · 333 across the 36 of their papers we have counts for
38 papers
Second-order Raman and anharmonic lattice dynamics in lead-halide perovskites
Chao Shen, Florian Kluibenschedl, Ayan A. Zhumekenov +4
We explore the microscopic origin of THz-driven lattice dynamics in methylammonium lead bromide CHNHPbBr using two-dimensional THz Kerr-effect spectroscopy. The analysi…
Learning shape resonances from the stabilization method
Daniel Kromm, Hans-Werner Hammer, Artem Volosniev
Resonances in quantum mechanics are commonly introduced as quasi-bound states embedded in the continuum, a perspective that can be conceptually challenging due to the abstract natu…
Anomalous valley Hall dynamics of exciton-polaritons
Xingzhou Chen, Yuanjun Guan, Areg Ghazaryan +6
The valley degree of freedom in atomically thin transition-metal dichalcogenides provides a natural binary index for information processing. Exciton-polaritons formed under strong…
Generalized Gross-Pitaevskii Equation for 2D Bosons with Attractive Interactions
Michał Suchorowski, Fabian Brauneis, Hans-Werner Hammer +2
We introduce a generalized Gross-Pitaevskii equation that provides a nonlinear framework for studying two-dimensional (2D) attractive Bose systems. Its defining feature is the loga…
Using optical tweezers to simultaneously trap, charge and measure the charge of a microparticle in air
Andrea Stoellner, Isaac C. D. Lenton, Artem G. Volosniev +9
Optical tweezers are widely used as a highly sensitive tool to measure forces on micron-scale particles. One such application is the measurement of the electric charge of a particl…
Phenomenological model of decaying Bose polarons
Ragheed Alhyder, Georg M. Bruun, Thomas Pohl +2
Cold atom experiments show that a mobile impurity particle immersed in a Bose-Einstein condensate forms a well-defined quasiparticle (Bose polaron) for weak to moderate impurity-bo…
Three-body Physics in the Impurity Limit of 39K Bose-Einstein Condensates
A. M. Morgen, S. S. Balling, M. T. Strøe +4
Loss spectroscopy is a key tool for investigating systems where important system parameters are linked to intrinsic resonant loss processes. We investigate loss processes of impuri…
Effective theory for strongly attractive one-dimensional fermions
Timothy G. Backert, Fabian Brauneis, Matija Čufar +3
We study a one-dimensional system of two-component fermions in the limit of strong attractive particle-particle interactions. First, we analyze scattering in the corresponding few-…
Two-dimensional bosonic droplets in a harmonic trap
Fabian Brauneis, Artem G. Volosniev, Hans-Werner Hammer
We investigate a system of bosons in a two-dimensional harmonic trap. In the limit of strong attractive interactions, the bosons make a droplet insensitive to external confinement.…
Comparison of renormalized interactions using one-dimensional few-body systems as a testbed
Fabian Brauneis, Hans-Werner Hammer, Stephanie M. Reimann +1
Even though the one-dimensional contact interaction requires no regularization, renormalization methods have been shown to improve the convergence of numerical ab initio calculatio…
Necklace Ansatz for strongly repulsive spin mixtures on a ring
Gianni Aupetit-Diallo, Giovanni Pecci, Artem Volosniev +3
We propose an alternative to the Bethe Ansatz method for strongly-interacting fermionic (or bosonic) mixtures on a ring. Starting from the knowledge of the solution for single-comp…
Quantum rotor in a two-dimensional mesoscopic Bose gas
Michał Suchorowski, Alina Badamshina, Mikhail Lemeshko +2
We investigate a molecular quantum rotor in a two-dimensional Bose-Einstein condensate. The focus is on studying the angulon quasiparticle concept in the crossover from few- to man…
Massive Dirac-Pauli physics in lead-halide perovskites
Abhishek Shiva Kumar, Mikhail Maslov, Mikhail Lemeshko +2
In standard quantum electrodynamics (QED), the so-called non-minimal (Pauli) coupling is suppressed for elementary particles and has no physical implications. Here, we show that th…
Observation of Analogue Dynamic Schwinger Effect and Non-Perturbative Light Sensing in Lead Halide Perovskites
Dusan Lorenc, Artem G. Volosniev, Ayan A. Zhumekenov +5
Dielectric breakdown of physical vacuum (Schwinger effect) is the textbook demonstration of compatibility of Relativity and Quantum theory. Although observing this effect is still…
Anisotropic potential immersed in a dipolar Bose-Einstein condensate
Neelam Shukla, Artem G. Volosniev, Jeremy R. Armstrong
We study a modified three-dimensional Gross-Pitaevski equation that describes a static impurity in a dipolar Bose-Einstein condensate (BEC). Our focus is on the interplay between t…
Classical 'spin' filtering with two degrees of freedom and dissipation
Atul Varshney, Areg Ghazaryan, Artem G. Volosniev
Coupling of angular motion to a spin degree of freedom gives rise to various transport phenomena in quantum systems that are beyond the standard paradigms of classical physics. Her…
Linear rotor in an ideal Bose gas near the threshold for binding
Tibor Dome, Artem G. Volosniev, Areg Ghazaryan +3
We study a linear rotor in a bosonic bath within the angulon formalism. Our focus is on systems where isotropic or anisotropic impurity-boson interactions support a shallow bound s…
Achiral dipoles on a ferromagnet can affect its magnetization direction
Ragheed Alhyder, Alberto Cappellaro, Mikhail Lemeshko +1
We demonstrate the possibility of a coupling between the magnetization direction of a ferromagnet and the tilting angle of adsorbed achiral molecules. To illustrate the mechanism o…
Non-equilibrium dynamics of dipolar polarons
Artem G. Volosniev, Giacomo Bighin, Luis Santos +1
We study the out-of-equilibrium quantum dynamics of dipolar polarons, i.e., impurities immersed in a dipolar Bose-Einstein condensate, after a quench of the impurity-boson interact…
Bond polarizability as a probe of local crystal fields in hybrid lead-halide perovskites
Yujing Wei, Artem G. Volosniev, Dusan Lorenc +4
A rotating organic cation and a dynamically disordered soft inorganic cage are the hallmark features of hybrid organic-inorganic lead-halide perovskites. Understanding the interpla…
Finite-range bias in fitting three-body loss to the zero-range model
Sofia Agafonova, Mikhail Lemeshko, Artem G. Volosniev
We study the impact of finite-range physics on the zero-range-model analysis of three-body recombination in ultracold atoms. We find that temperature dependence of the zero-range p…
Emergence of a Bose polaron in a small ring threaded by the Aharonov-Bohm flux
Fabian Brauneis, Areg Ghazaryan, Hans-Werner Hammer +1
The model of a ring threaded by the Aharonov-Bohm flux underlies our understanding of a coupling between gauge potentials and matter. The typical formulation of the model is based…
Dissipative dynamics of an impurity with spin-orbit coupling
Areg Ghazaryan, Alberto Cappellaro, Mikhail Lemeshko +1
Brownian motion of a mobile impurity in a bath is affected by spin-orbit coupling (SOC). Here, we discuss a Caldeira-Leggett-type model that can be used to propose and interpret qu…
Magnetic impurity in a one-dimensional few-fermion system
Lukas Rammelmüller, David Huber, Matija Čufar +3
We present a numerical analysis of spin- fermions in a one-dimensional harmonic potential in the presence of a magnetic point-like impurity at the center of the trap.…