Many-body bound states and induced interactions of charged impurities in a bosonic bath

• URL: http://arxiv.org/abs/2206.03476v3
• Date: Tue, 28 Mar 2023 14:38:38 GMT
• Title: Many-body bound states and induced interactions of charged impurities in a bosonic bath
• Authors: G. E. Astrakharchik, L. A. Pe\~na Ardila, K. Jachymski and A. Negretti
• Abstract summary: We investigate the static properties of one and two ionic impurities in a bosonic bath using quantum Monte Carlo methods. We identify three bipolaronic regimes depending on the strength of the atom-ion potential and the number of its two-body bound states. Our findings show that numerical simulations are indispensable for describing highly correlated impurity models.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Induced interactions and bound states of charge carriers immersed in a quantum medium are crucial for the investigation of quantum transport. Ultracold atom-ion systems can provide a convenient platform for studying this problem. Here, we investigate the static properties of one and two ionic impurities in a bosonic bath using quantum Monte Carlo methods. We identify three bipolaronic regimes depending on the strength of the atom-ion potential and the number of its two-body bound states: a perturbative regime resembling the situation of a pair of neutral impurities, a non-perturbative regime that loses the quasi-particle character of the former, and a many-body bound state regime that can arise only in the presence of a bound state in the two-body potential. We further reveal strong bath-induced interactions between the two ionic polarons. Our findings show that numerical simulations are indispensable for describing highly correlated impurity models.

Related papers

• Engineering impurity Bell states through coupling with a quantum bath [0.0]
  We consider two distinguishable impurities immersed in an atomic background cloud of bosons, with the entire system being confined in a harmonic trap. We show that the two impurities can form spatially entangled bipolaron states due to mediated interactions from the bosonic bath.
  arXiv  Detail & Related papers  (2024-06-11T05:50:16Z)
• Universal quantum dynamics of Bose polarons [0.0]
  We measure the spectral properties and real-time dynamics of mobile impurities injected into a homogeneous Bose--Einstein condensate. We map out both attractive and repulsive branches of polaron quasiparticles. For near-resonant interactions the polarons are no longer well defined, but the universality still holds.
  arXiv  Detail & Related papers  (2024-02-22T18:59:55Z)
• Fermi polaron in atom-ion hybrid systems [0.0]
  We investigate the ionic Fermi polaron consisting of a charged impurity interacting with a polarized Fermi bath. We find a smooth polaron-molecule transition for strong coupling, in contrast with the neutral case, where the transition smoothens only for finite temperature and finite impurity density. This study may provide valuable insights into alternative solid-state systems such as Fermi excitons polarons in atomically thin semiconductors.
  arXiv  Detail & Related papers  (2024-01-10T18:45:02Z)
• The strongly driven Fermi polaron [49.81410781350196]
  Quasiparticles are emergent excitations of matter that underlie much of our understanding of quantum many-body systems. We take advantage of the clean setting of homogeneous quantum gases and fast radio-frequency control to manipulate Fermi polarons. We measure the decay rate and the quasiparticle residue of the driven polaron from the Rabi oscillations between the two internal states.
  arXiv  Detail & Related papers  (2023-08-10T17:59:51Z)
• Dilute neutron star matter from neural-network quantum states [58.720142291102135]
  Low-density neutron matter is characterized by the formation of Cooper pairs and the onset of superfluidity. We model this density regime by capitalizing on the expressivity of the hidden-nucleon neural-network quantum states combined with variational Monte Carlo and reconfiguration techniques.
  arXiv  Detail & Related papers  (2022-12-08T17:55:25Z)
• Formation of robust bound states of interacting microwave photons [148.37607455646454]
  One of the hallmarks of interacting systems is the formation of multi-particle bound states. We develop a high fidelity parameterizable fSim gate that implements the periodic quantum circuit of the spin-1/2 XXZ model. By placing microwave photons in adjacent qubit sites, we study the propagation of these excitations and observe their bound nature for up to 5 photons.
  arXiv  Detail & Related papers  (2022-06-10T17:52:29Z)
• Localization Dynamics from Static and Mobile Impurities [3.803244458097104]
  We study the superfluid response and localization dynamics from static and mobile impurities. The superfluidity is formed in the rung-Mott phase of a bosonic ladder model. We study the superfluid currents both in the weakly-coupled and strongly-coupled rungs limits for the bosons.
  arXiv  Detail & Related papers  (2021-01-16T10:10:06Z)
• Quantum chaos driven by long-range waveguide-mediated interactions [125.99533416395765]
  We study theoretically quantum states of a pair of photons interacting with a finite periodic array of two-level atoms in a waveguide. Our calculation reveals two-polariton eigenstates that have a highly irregular wave-function in real space.
  arXiv  Detail & Related papers  (2020-11-24T07:06:36Z)
• Collective spontaneous emission of two entangled atoms near an oscillating mirror [50.591267188664666]
  We consider the cooperative spontaneous emission of a system of two identical atoms, interacting with the electromagnetic field in the vacuum state. Using time-dependent theory, we investigate the spectrum of the radiation emitted by the two-atom system. We show that it is modulated in time, and that the presence of the oscillating mirror can enhance or inhibit the decay rate.
  arXiv  Detail & Related papers  (2020-10-07T06:48:20Z)
• A multiconfigurational study of the negatively charged nitrogen-vacancy center in diamond [55.58269472099399]
  Deep defects in wide band gap semiconductors have emerged as leading qubit candidates for realizing quantum sensing and information applications. Here we show that unlike single-particle treatments, the multiconfigurational quantum chemistry methods, traditionally reserved for atoms/molecules, accurately describe the many-body characteristics of the electronic states of these defect centers.
  arXiv  Detail & Related papers  (2020-08-24T01:49:54Z)
• Ionic polaron in a Bose-Einstein condensate [0.0]
  The presence of strong interactions in a many-body quantum system can lead to a variety of exotic effects. We show that even in a relatively simple setup the competition of length scales gives rise to a highly correlated state. Our findings are directly relevant to experiments using hybrid atom-ion setups that have recently attained the ultracold regime.
  arXiv  Detail & Related papers  (2020-05-25T11:10:34Z)

This list is automatically generated from the titles and abstracts of the papers in this site.

This site does not guarantee the quality of this site (including all information) and is not responsible for any consequences.