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Xin F, Falsi L, Gelkop Y, Pierangeli D, Zhang G, Bo F, Fusella F, Agranat AJ, DelRe E. Evidence of 3D Topological-Domain Dynamics in KTN:Li Polarization-Supercrystal Formation. PHYSICAL REVIEW LETTERS 2024; 132:066603. [PMID: 38394586 DOI: 10.1103/physrevlett.132.066603] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/07/2023] [Revised: 10/31/2023] [Accepted: 01/05/2024] [Indexed: 02/25/2024]
Abstract
We experimentally and theoretically investigate thermal domain evolution in near-transition KTN:Li. Results allow us to establish how polarization supercrystals form, a hidden 3D topological phase composed of hypervortex defects. These are the result of six converging polarization vortices, each associated to one orientation of the 3D broken inversion symmetry. We also identify rescaling soliton lattices and domain patterns that replicate on different scales. Findings shed light on volume domain self-organization into closed-flux patterns and open up new scenarios for topologically protected noise-resistant ferroelectric memory bits.
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Affiliation(s)
- Feifei Xin
- Dipartimento di Fisica, Università di Roma "La Sapienza", 00185 Rome, Italy
- The MOE Key Laboratory of Weak-Light Nonlinear Photonics, School of Physics and TEDA Applied Physics Institute, Nankai University, Tianjin 300071, China
| | - Ludovica Falsi
- Dipartimento di Fisica, Università di Roma "La Sapienza", 00185 Rome, Italy
| | - Yehonatan Gelkop
- The Institute of Applied Physics, The Hebrew University, Jerusalem 91904, Israel
| | - Davide Pierangeli
- Dipartimento di Fisica, Università di Roma "La Sapienza", 00185 Rome, Italy
- Institute for Complex Systems, National Research Council, Rome 00185, Italy
| | - Guoquan Zhang
- The MOE Key Laboratory of Weak-Light Nonlinear Photonics, School of Physics and TEDA Applied Physics Institute, Nankai University, Tianjin 300071, China
| | - Fang Bo
- The MOE Key Laboratory of Weak-Light Nonlinear Photonics, School of Physics and TEDA Applied Physics Institute, Nankai University, Tianjin 300071, China
| | - Fabrizio Fusella
- Dipartimento di Fisica, Università di Roma "La Sapienza", 00185 Rome, Italy
| | - Aharon J Agranat
- The Institute of Applied Physics, The Hebrew University, Jerusalem 91904, Israel
| | - Eugenio DelRe
- Dipartimento di Fisica, Università di Roma "La Sapienza", 00185 Rome, Italy
- ISC-CNR, Università di Roma "La Sapienza", 00185 Rome, Italy
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Saez G, Castro MA, Allende S, Nunez AS. Model for Nonrelativistic Topological Multiferroic Matter. PHYSICAL REVIEW LETTERS 2023; 131:226801. [PMID: 38101376 DOI: 10.1103/physrevlett.131.226801] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/30/2023] [Revised: 08/23/2023] [Accepted: 10/24/2023] [Indexed: 12/17/2023]
Abstract
We provide a model capable of accounting for the multiferroicity in certain materials. The model's base is on free electrons and spin moments coupled within nonrelativistic quantum mechanics. The synergistic interplay between the magnetic and electric degrees of freedom that turns into the multiferroic phenomena occurs at a profound quantum mechanical level, conjured by Berry's phases and the quantum theory of polarization. Our results highlight the geometrical nature of the multiferroic order parameter that naturally leads to magnetoelectric domain walls, with promising technological potential.
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Affiliation(s)
- Guidobeth Saez
- Departamento de Física, Facultad de ciencias físicas y matemáticas, Universidad de Chile, Santiago 8370449, Chile
- Centro de Nanociencia y Nanotecnología CEDENNA, Avda. Ecuador 3493, Santiago, Chile
| | - Mario A Castro
- Centro de Nanociencia y Nanotecnología CEDENNA, Avda. Ecuador 3493, Santiago, Chile
- Departamento de Física, Universidad de Santiago de Chile, 9170124, Santiago, Chile
| | - Sebastian Allende
- Centro de Nanociencia y Nanotecnología CEDENNA, Avda. Ecuador 3493, Santiago, Chile
- Departamento de Física, Universidad de Santiago de Chile, 9170124, Santiago, Chile
| | - Alvaro S Nunez
- Departamento de Física, Facultad de ciencias físicas y matemáticas, Universidad de Chile, Santiago 8370449, Chile
- Centro de Nanociencia y Nanotecnología CEDENNA, Avda. Ecuador 3493, Santiago, Chile
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Henriques JCG, Antão TVC, Peres NMR. Laser induced enhanced coupling between photons and squeezed magnons in antiferromagnets. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2022; 34:245802. [PMID: 35420060 DOI: 10.1088/1361-648x/ac5f61] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/21/2022] [Accepted: 03/21/2022] [Indexed: 06/14/2023]
Abstract
In this paper we consider a honeycomb antiferromagnet subject to an external laser field. Obtaining a time-independent effective Hamiltonian, we find that the external laser renormalizes the exchange interaction between the in-plane components of the spin-operators, and induces a synthetic Dzyaloshinskii-Moria interaction (DMI) between second neighbors. The former allows the control of the magnon dispersion's bandwidth and the latter breaks time-reversal symmetry inducing non-reciprocity in momentum space. The eigen-excitations of the system correspond to squeezed magnons whose squeezing parameters depend on the properties of the laser. When studying how these spin excitations couple with cavity photons, we obtain a coupling strength which can be enhanced by an order of magnitude via careful tuning of the laser's intensity, when compared to the case where the laser is absent. The transmission plots through the cavity are presented, allowing the mapping of the magnons' dispersion relation.
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Affiliation(s)
- J C G Henriques
- Department and Centre of Physics, University of Minho, Campus of Gualtar, 4710-057 Braga, Portugal
| | - T V C Antão
- Department and Centre of Physics, University of Minho, Campus of Gualtar, 4710-057 Braga, Portugal
| | - N M R Peres
- Department and Centre of Physics, University of Minho, Campus of Gualtar, 4710-057 Braga, Portugal
- International Iberian Nanotechnology Laboratory (INL), Av. Mestre Jose Veiga, 4715-330 Braga, Portugal
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