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Superradiance, bosonic Peierls distortion, and lattice gauge theory in a generalized Rabi-Hubbard chain
Stockholm University, Faculty of Science, Department of Physics.ORCID iD: 0000-0003-2038-3419
Stockholm University, Faculty of Science, Department of Physics.
Number of Authors: 22020 (English)In: Physical Review A: covering atomic, molecular, and optical physics and quantum information, ISSN 2469-9926, E-ISSN 2469-9934, Vol. 102, no 6, article id 063711Article in journal (Refereed) Published
Abstract [en]

We investigate a one-dimensional Rabi-Hubbard type of model, arranged such that a quantum dot is sandwiched between every cavity. The role of the quantum dot is twofold, to transmit photons between neighboring cavities and simultaneously act as an effective photon nonlinearity. We consider three-level quantum dots in the A configuration, where the left and right leg couple exclusively to the left or right cavity. This noncommuting interaction leads to two highly entangled incompressible phases, separated by a second-order quantum phase transition; the degrees of freedom of the quantum dots can be viewed as a dynamical lattice for the photons which spontaneously breaks Z(2) symmetry due to a bosonic Peierls instability, leading to a phase with dimerized order. Additionally, we find a normal insulating phase and a superfluid phase that acts as a quantum many-body superradiant phase. In the superradiant phase, a Z(2) symmetry is broken and the phase transition falls within the universality class of the transverse-field Ising model. Finally, we show that the model can be interpreted as a Z(2) lattice gauge theory in the absence of a dipolar field on the lower qutrit levels.

Place, publisher, year, edition, pages
2020. Vol. 102, no 6, article id 063711
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:su:diva-190664DOI: 10.1103/PhysRevA.102.063711ISI: 000597808100012OAI: oai:DiVA.org:su-190664DiVA, id: diva2:1532989
Available from: 2021-03-03 Created: 2021-03-03 Last updated: 2023-03-13Bibliographically approved
In thesis
1. Triptych of quantum matter in one dimension: Playful constructions in theoretical and computational physics
Open this publication in new window or tab >>Triptych of quantum matter in one dimension: Playful constructions in theoretical and computational physics
2023 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

In this compilation thesis, three different quantum mechanical systems are presented. All three have in common that they are one-dimensional quantum systems which, each in their own way, can be seen as analogous to other quantum systems. Chapter 2 is an introduction which takes on the ambitious task to guide the reader from standard quantum mechanical theory to the theory of condensed matter physics. In chapter 3 I present a theory for creating co- herent oscillations in the adiabatic eigenstates of time-periodic quantum systems. These are directly analogous to so-called Bloch oscillations which appear for electrons in periodical potentials which are subjected to a constant force. Chapter 4 concerns how phonon physics, in particular the Peierls instability, can be mimicked in systems of interacting ultacold quantum mechanical gases. In chapter 5, I present quantum mechanical circuits (circuit QED). We propose a circuit where the low-energy physics is analogous to a strongly interacting generalized spin chain, where the so-called superradiance directly correspond to a polarized Ising phase. 

Place, publisher, year, edition, pages
Stockholm: Department of Physics, Stockholm University, 2023. p. 132
Keywords
Bloch oscillations, Peierls, adiabatic, diabatic, ultracold atoms, Bose-Fermi mixtures, phonon, cQED, superradiance, polarons, DMRG, MPS, Kosterlitz-Thouless, Wannier, Bloch, quantum phase transitions
National Category
Condensed Matter Physics Atom and Molecular Physics and Optics
Research subject
Theoretical Physics
Identifiers
urn:nbn:se:su:diva-215403 (URN)978-91-8014-234-2 (ISBN)978-91-8014-235-9 (ISBN)
Public defence
2023-04-27, sal FB42, AlbaNova universitetscentrum, Roslagstullsbacken 21 and online via Zoom https://stockholmuniversity.zoom.us/j/62067309502, Stockholm, 13:00 (English)
Opponent
Supervisors
Funder
Knut and Alice Wallenberg Foundation, 31001190Swedish Research Council, 31001189
Available from: 2023-04-03 Created: 2023-03-13 Last updated: 2023-03-28Bibliographically approved

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Gagge, AxelLarson, Jonas

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