TY - JOUR AU - Moca, Pascu Catalin AU - Werner, Miklós Antal AU - Valli, Angelo AU - Prosen, T. AU - Zaránd, Gergely Attila TI - Kardar-Parisi-Zhang scaling in the Hubbard model JF - PHYSICAL REVIEW B J2 - PHYS REV B VL - 108 PY - 2023 IS - 23 PG - 13 SN - 2469-9950 DO - 10.1103/PhysRevB.108.235139 UR - https://m2.mtmt.hu/api/publication/34448264 ID - 34448264 N1 - Funding Agency and Grant Number: Hungarian Academy of Sciences [NKP-22-5-BME-330]; New National Excellence Program Funding text: We thank Roderich Mossner, Sebastian Diehl, and Ors Legeza for valuable discussions. This research was supported by the Ministry of Culture and Innovation and the National Research, Development and Innovation Office (NKFIH) within the Quantum Information National Laboratory of Hungary (Grant No. 2022-2.1.1-NL-2022-00004), and through NKFIH Research Grants No. K134983 and No. SNN139581. C.P.M. acknowledges support by the Ministry of Research, Innovation and Digitization, CNCS/CCCDI- UEFISCDI, under Project No. PN-III-P4-ID-PCE-2020-0277, under the project for funding the excellence, Contract No. 29 PFE/30.12.2021. T.P. acknowledges ERC Advanced Grant No. 694544-OMNES and ARRS Research Program No. P1-0402. M.A.W. has been supported by the Bolyai Research Scholarship of the Hungarian Academy of Sciences and by Grant No. & Uacute;NKP-22-5-BME-330 of the New National Excellence Program.r 29 PFE/30.12.2021. T.P. acknowledges ERC Advanced Grant No. 694544-OMNES and ARRS Research Program No. P1-0402. M.A.W. has been supported by the Bolyai Researchr Scholarship of the Hungarian Academy of Sciences and by Grant No. & Uacute;NKP-22-5-BME-330 of the New National Excellence Program. AB - We explore the Kardar-Parisi-Zhang (KPZ) scaling in the one-dimensional Hubbard model, which exhibits global SUc(2)⊗ - SUs(2) symmetry at half filling, for the pseudocharge and the total spin. We analyze dynamical scaling properties of high-temperature charge and spin correlations and transport. At half filling, we observe a clear KPZ scaling in both charge and spin sectors. Away from half filling, the SUc(2) charge symmetry is reduced to Uc(1), while the SUs(2) symmetry for the total spin is retained. Consequently, transport in the charge sector becomes ballistic, while KPZ scaling is preserved in the spin sector. These findings confirm the link between non-Abelian symmetries and KPZ scaling in the presence of integrability. We study two settings of the model: one involving a quench from a bipartitioned state asymptotically close to the T=∞ equilibrium state of the system, and another where the system is coupled to two Markovian reservoirs at the two edges of the chain. © 2023 American Physical Society. LA - English DB - MTMT ER - TY - JOUR AU - Werner, Miklós Antal AU - Moca, Pascu Catalin AU - Kormos, Márton AU - Legeza, Örs AU - Dóra, Balázs AU - Zaránd, Gergely Attila TI - Spectroscopic evidence for engineered hadronic bound state formation in repulsive fermionic SU ( N ) Hubbard systems JF - PHYSICAL REVIEW RESEARCH J2 - PRRESEARCH VL - 5 PY - 2023 IS - 4 PG - 12 SN - 2643-1564 DO - 10.1103/PhysRevResearch.5.043020 UR - https://m2.mtmt.hu/api/publication/34187639 ID - 34187639 N1 - Export Date: 08 March 2024 LA - English DB - MTMT ER - TY - JOUR AU - Tichai, A. AU - Knecht, S. AU - Kruppa, András Tibor AU - Legeza, Örs AU - Moca, Pascu Catalin AU - Schwenk, A. AU - Werner, Miklós Antal AU - Zaránd, Gergely Attila TI - Combining the in-medium similarity renormalization group with the density matrix renormalization group: Shell structure and information entropy JF - PHYSICS LETTERS B J2 - PHYS LETT B VL - 845 PY - 2023 PG - 6 SN - 0370-2693 DO - 10.1016/j.physletb.2023.138139 UR - https://m2.mtmt.hu/api/publication/34143529 ID - 34143529 AB - We propose a novel many-body framework combining the density matrix renormalization group (DMRG) with the valence-space (VS) formulation of the in-medium similarity renormalization group. This hybrid scheme admits for favorable computational scaling in large-space calculations compared to direct diagonalization. The capacity of the VS-DMRG approach is highlighted in ab initio calculations of neutron-rich nickel isotopes based on chiral two- and three-nucleon interactions, and allows us to perform converged ab initio computations of ground and excited state energies. We also study orbital entanglement in the VS-DMRG, and investigate nuclear correlation effects in oxygen, neon, and magnesium isotopes. The explored entanglement measures reveal nuclear shell closures as well as pairing correlations. LA - English DB - MTMT ER - TY - JOUR AU - Sticlet, Doru AU - Moca, Pascu Catalin AU - Dóra, Balázs TI - Correlations at higher-order exceptional points in non-Hermitian models JF - PHYSICAL REVIEW B J2 - PHYS REV B VL - 108 PY - 2023 IS - 7 SN - 2469-9950 DO - 10.1103/PhysRevB.108.075133 UR - https://m2.mtmt.hu/api/publication/34096494 ID - 34096494 N1 - National Institute for R&D of Isotopic and Molecular Technologies, 67-103 Donat, Cluj-Napoca, 400293, Romania Department of Theoretical Physics, Institute of Physics, Budapest University of Technology and Economics, Muegyetem rkp. 3, Budapest, H-1111, Hungary Department of Physics, University of Oradea, Oradea, 410087, Romania MTA-BME Lendület Topology and Correlation Research Group, Budapest University of Technology and Economics, Muegyetem rkp. 3, Budapest, H-1111, Hungary Export Date: 7 September 2023 LA - English DB - MTMT ER - TY - JOUR AU - Ostahie, Bogdan AU - Sticlet, Doru AU - Moca, Pascu Catalin AU - Dóra, Balázs AU - Werner, Miklós Antal AU - Asbóth, János Károly AU - Zaránd, Gergely Attila TI - Multiparticle quantum walk: A dynamical probe of topological many-body excitations JF - PHYSICAL REVIEW B J2 - PHYS REV B VL - 108 PY - 2023 IS - 3 PG - 7 SN - 2469-9950 DO - 10.1103/PhysRevB.108.035126 UR - https://m2.mtmt.hu/api/publication/34064508 ID - 34064508 LA - English DB - MTMT ER - TY - JOUR AU - Dóra, Balázs AU - Werner, Miklós Antal AU - Moca, Pascu Catalin TI - Quantum quench dynamics in the Luttinger liquid phase of the Hatano-Nelson model JF - PHYSICAL REVIEW B J2 - PHYS REV B VL - 108 PY - 2023 IS - 3 PG - 8 SN - 2469-9950 DO - 10.1103/PhysRevB.108.035104 UR - https://m2.mtmt.hu/api/publication/34047664 ID - 34047664 N1 - Export Date: 08 March 2024 LA - English DB - MTMT ER - TY - JOUR AU - Moca, Pascu Catalin AU - Sticlet, Doru AU - Dóra, Balázs AU - Zaránd, Gergely Attila TI - PT -symmetry phase transition in a Bose-Hubbard model with localized gain and loss JF - PHYSICAL REVIEW B J2 - PHYS REV B VL - 107 PY - 2023 IS - 11 SN - 2469-9950 DO - 10.1103/PhysRevB.107.115111 UR - https://m2.mtmt.hu/api/publication/33684677 ID - 33684677 N1 - Department of Theoretical Physics, Institute of Physics, Budapest University of Technology and Economics, Muegyetem rkp. 3, Budapest, H-1111, Hungary Department of Physics, University of Oradea, Oradea, 410087, Romania National Institute for Research and Development of Isotopic and Molecular Technologies, 67-103 Donat, Cluj-Napoca, 400293, Romania MTA-BME, Lendület Topology and Correlation Research Group, Budapest University of Technology and Economics, Muegyetem rkp. 3, Budapest, H-1111, Hungary MTA-BME, Quantum Dynamics and Correlations Research Group, Budapest University of Technology and Economics, Muegyetem rkp. 3, Budapest, H-1111, Hungary LA - English DB - MTMT ER - TY - JOUR AU - Dóra, Balázs AU - Moca, Pascu Catalin TI - Full counting statistics in the many-body Hatano-Nelson model JF - PHYSICAL REVIEW B J2 - PHYS REV B VL - 106 PY - 2022 IS - 23 SN - 2469-9950 DO - 10.1103/PhysRevB.106.235125 UR - https://m2.mtmt.hu/api/publication/33335564 ID - 33335564 N1 - MTA-BME Lendület Topology and Correlation Research Group, Budapest University of Technology and Economics, Budapest, 1521, Hungary Department of Theoretical Physics, Budapest University of Technology and Economics, Budapest, 1521, Hungary MTA-BME Quantum Dynamics and Correlations Research Group, Institute of Physics, Budapest University of Technology and Economics, Budapest, 1521, Hungary Department of Physics, University of Oradea, Oradea, 410087, Romania Cited By :1 AB - We study non-Hermitian many-body physics in the interacting Hatano-Nelson model with an open boundary condition. The violation of reciprocity, resulting from an imaginary vector potential, induces the non-Hermitian skin effect and causes exponential localization for all single-particle eigenfunctions in the noninteracting limit. Nevertheless, the density profile of the interacting system becomes only slightly tilted relative to the average filling. The Friedel oscillations exhibit a beating pattern due to the modification of the Fermi wave number. The probability distribution of particles over any finite interval is the normal distribution, whose mean scales with the imaginary vector potential and the variance is symmetric to the center of the chain. This is confirmed by several numerically exact methods even for relatively small systems. These features are expected to be generic not only for fermions, which naturally repel each other due to Pauli's exclusion principle, but for interacting bosons as well. Our findings indicate thatmany-body effects can significantly alter and conceal the single-particle properties and the skin effect in non-Hermitian systems. LA - English DB - MTMT ER - TY - JOUR AU - Kiss, Roberta Zsófia AU - Sticlet, Doru AU - Moca, Pascu Catalin AU - Dóra, Balázs TI - Non-Hermitian off-diagonal magnetic response of Dirac fermions JF - PHYSICAL REVIEW B J2 - PHYS REV B VL - 106 PY - 2022 IS - 16 SN - 2469-9950 DO - 10.1103/PhysRevB.106.165411 UR - https://m2.mtmt.hu/api/publication/33137706 ID - 33137706 N1 - Funding Agency and Grant Number: National Research, Development, and Innovation Office -NKFIH within the Quantum Technology National Excellence Program [2017-1.2.1-NKP2017-00001, K142179, K134437]; Ministry of Research, Innovation and Digitization, CNCS/CCCDI-UEFISCDI [PN-III-P4-ID-PCE-2020-0277, PN-III-P1-1.1-TE-20190423, 29 PFE/30.12.2021]; BME-Nanotechnology FIKP Grant (BME FIKP-NAT) Funding text: Useful discussions with Ferenc Simon and Janos Asboth are gratefully acknowledged. This research is supported by the National Research, Development, and Innovation Office -NKFIH within the Quantum Technology National Excellence Program (Project No. 2017-1.2.1-NKP2017-00001), No. K142179 and No. K134437, by the BME-Nanotechnology FIKP Grant (BME FIKP-NAT), and by a Grant of the Ministry of Research, Innovation and Digitization, CNCS/CCCDI-UEFISCDI, under Projects No. PN-III-P4-ID-PCE-2020-0277, No. PN-III-P1-1.1-TE-20190423, and No. 29 PFE/30.12.2021. AB - We perform a comparative study for the magnetization dynamics within linear response theory of one and two dimensional massive Dirac electrons, after switching on either a real (Hermitian) or an imaginary (non-Hermitian) magnetic field. While Hermitian dc magnetic fields polarize the spins in the direction of the external magnetic field, non-Hermitian magnetic fields induce only off diagonal response. An imaginary dc magnetic field perpendicular to the mass term induces finite magnetization in the third direction only according to the right hand rule. This can be understood by analyzing the non-Hermitian equation of motion of the spin, which becomes analogous to a classical particle in crossed electric and magnetic fields. Therein, the spin expectation value, the mass term, and imaginary magnetic field play the role of the classical momentum, magnetic, and electric field, respectively. The latter two create a drift velocity perpendicular to them, which gives rise to the off-diagonal component of the dc spin susceptibility, similarly to how the Hall effect develops in the classical description. LA - English DB - MTMT ER - TY - JOUR AU - Moca, Pascu Catalin AU - Werner, Miklós Antal AU - Legeza, Örs AU - Prosen, Tomaz AU - Kormos, Márton AU - Zaránd, Gergely Attila TI - Simulating Lindbladian evolution with non-Abelian symmetries: Ballistic front propagation in the SU(2) Hubbard model with a localized loss JF - PHYSICAL REVIEW B J2 - PHYS REV B VL - 105 PY - 2022 IS - 19 PG - 11 SN - 2469-9950 DO - 10.1103/PhysRevB.105.195144 UR - https://m2.mtmt.hu/api/publication/32896176 ID - 32896176 AB - We develop a non-Abelian time evolving block decimation (NA-TEBD) approach to study open systems governed by Lindbladian time evolution, while exploiting an arbitrary number of Abelian or non-Abelian symmetries. We illustrate this method in a one-dimensional fermionic SU(2) Hubbard model on a semi-infinite lattice with localized particle loss at one end. We observe a ballistic front propagation with strongly renormalized front velocity, and a hydrodynamic current density profile. For large loss rates, a suppression of the particle current is observed, as a result of the quantum Zeno effect. Operator entanglement is found to propagate faster than the depletion profile, preceding the latter. LA - English DB - MTMT ER -