TY - JOUR AU - Kiss, Annamária AU - Zaránd, Gergely Attila AU - Lovas, I. TI - Complete replica solution for the transverse field Sherrington-Kirkpatrick spin glass model with continuous-time quantum Monte Carlo method JF - PHYSICAL REVIEW B J2 - PHYS REV B VL - 109 PY - 2024 IS - 2 PG - 20 SN - 2469-9950 DO - 10.1103/PhysRevB.109.024431 UR - https://m2.mtmt.hu/api/publication/34568147 ID - 34568147 N1 - Institute for Solid State Physics and Optics, Wigner Research Centre for Physics, P.O. Box 49, Budapest, H-1525, Hungary Department of Theoretical Physics, Institute of Physics, 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 Kavli Institute for Theoretical Physics, University of California, Santa Barbara, CA 93106, United States Export Date: 9 February 2024 Funding details: 2022-2.1.1-NL-2022-00004 Funding details: National Science Foundation, NSF, PHY-1748958 Funding details: Gordon and Betty Moore Foundation, GBMF, GBMF8690 Funding details: Nemzeti Kutatási Fejlesztési és Innovációs Hivatal, NKFI, K142652 Funding text 1: We thank C. P. Moca, S. Sachdev, M. J. Rozenberg, B. K. Chakrabarti, and M. Müller for insightful discussions. I.L. acknowledges support from the Gordon and Betty Moore Foundation through Grant No. GBMF8690 to UCSB and from the National Science Foundation under Grant No. NSF PHY-1748958. A.K. acknowledges support from the National Research Development and Innovation Office (NKFIH) through Grant No. K142652. 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). AB - We construct a complete numerically exact solution of a mean-field quantum spin glass model - the transverse field Sherrington-Kirkpatrick model - by implementing a continuous-time quantum Monte Carlo method in the presence of full replica symmetry breaking. We extract the full numerically exact phase diagram, displaying a glassy phase with continuous replica symmetry breaking at small transverse fields and low temperatures. A paramagnetic phase emerges once thermal and quantum fluctuations melt the spin glass. We characterize both phases by extracting the order parameter as well as the static and dynamical local spin susceptibilities. The static susceptibility shows a plateau in the glassy phase, but it remains smooth across the phase boundary. For the imaginary part of the dynamical susceptibility, we find an Ohmic, i.e., linear in ω, scaling for small frequencies ω, with a slope independent of the transverse field. These results compare qualitatively well with ac susceptibility measurements on a dipole-coupled three-dimensional Ising magnet - the LiHoxY1-xF4 compound - in a transverse magnetic field. Our work provides a general framework for the exact numerical solution of mean-field quantum glass models, and it constitutes an important step towards understanding glassiness in realistic systems. © 2024 American Physical Society. LA - English DB - MTMT ER - 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 - 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 - 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 - Barcza, Gergely AU - Werner, Miklós Antal AU - Zaránd, Gergely Attila AU - Pershin, Anton AU - Benedek, Zsolt AU - Legeza, Örs AU - Szilvási, T. TI - Toward Large-Scale Restricted Active Space Calculations Inspired by the Schmidt Decomposition JF - JOURNAL OF PHYSICAL CHEMISTRY A J2 - J PHYS CHEM A VL - 126 PY - 2022 IS - 151 SP - 9709 EP - 9718 PG - 10 SN - 1089-5639 DO - 10.1021/acs.jpca.2c05952 UR - https://m2.mtmt.hu/api/publication/33536209 ID - 33536209 LA - English DB - MTMT ER - TY - JOUR AU - Kormos, Márton AU - Vörös, Dániel AU - Zaránd, Gergely Attila TI - Finite temperature dynamics in gapped 1D models in the sine-Gordon family JF - PHYSICAL REVIEW B J2 - PHYS REV B VL - 106 PY - 2022 IS - 20 PG - 17 SN - 2469-9950 DO - 10.1103/PhysRevB.106.205151 UR - https://m2.mtmt.hu/api/publication/33368446 ID - 33368446 N1 - Funding Agency and Grant Number: National Research, Development, and Innovation Office-NKFIH [K134983, K138606, SNN139581]; National Research, Development, and Innovation Office-NKFIH withon Quantum National Laboratory of Hungary program [2017-1.2.1-NKP-2017-00001]; "Bolyai Janos" grant of the HAS; new National Excellence Program of the Ministry for Innovation and Technology [UNKP-21-5] Funding text: We thank Benjamin Doyon and Gabor Takacs for illuminating discussions and Tomaz Prosen for drawing our attention to the recent works [44-46] . This research was supported by the National Research, Development, and Innovation Office-NKFIH through Research Grants No. K134983, No. K138606, and No. SNN139581, and within the Quantum National Laboratory of Hungary program (Project No. 2017-1.2.1-NKP-2017-00001) . M.K. acknowledges support by a "Bolyai Janos" grant of the HAS and by the UNKP-21-5 new National Excellence Program of the Ministry for Innovation and Technology from the source of the National Research, Development, and Innovation Fund. AB - The sine-Gordon model appears as the low-energy effective field theory of various one-dimensional gapped quantum systems. Here we investigate the dynamics of generic, nonintegrable systems belonging to the sine-Gordon family at finite temperature within the semiclassical approach. Focusing on timescales where the effect of nontrivial quasiparticle scatterings becomes relevant, we obtain universal results for the long-time behavior of dynamical correlation functions. We find that correlation functions of vertex operators behave neither ballistically nor diffusively but follow a stretched exponential decay in time. We also study the full counting statistics of the topological current and find that distribution of the transferred charge is non-Gaussian with its cumulants scaling nonuniformly in time. © 2022 American Physical Society. LA - English DB - MTMT ER - TY - JOUR AU - Kruppa, András Tibor AU - Kovács, József AU - Salamon, Péter AU - Legeza, Örs AU - Zaránd, Gergely Attila TI - Entanglement and seniority JF - PHYSICAL REVIEW C J2 - PHYS REV C VL - 106 PY - 2022 IS - 2 PG - 12 SN - 2469-9985 DO - 10.1103/PhysRevC.106.024303 UR - https://m2.mtmt.hu/api/publication/33208843 ID - 33208843 LA - English DB - MTMT ER - TY - JOUR AU - Grabarits, András József AU - Kormos, Márton AU - Lovas, Izabella AU - Zaránd, Gergely Attila TI - Classical theory of universal quantum work distribution in chaotic and disordered non-interacting Fermi systems JF - SCIENTIFIC REPORTS J2 - SCI REP VL - 12 PY - 2022 IS - 1 PG - 12 SN - 2045-2322 DO - 10.1038/s41598-022-18796-3 UR - https://m2.mtmt.hu/api/publication/33098390 ID - 33098390 N1 - Department of Theoretical Physics, Institute of Physics, Budapest University of Technology and Economics, Műegyetem rkp. 3., Budapest, H-1111, Hungary BME-MTA Exotic Quantum Phases ‘Lendület’ Research Group, Budapest University of Technology and Economics, Műegyetem rkp. 3., Budapest, H-1111, Hungary MTA-BME Quantum Dynamics and Correlations Research Group, Budapest University of Technology and Economics, Műegyetem rkp. 3., Budapest, H-1111, Hungary Department of Physics and Institute for Advanced Study, Technical University of Munich, Garching, D-85748, Germany Munich Center for Quantum Science and Technology (MCQST), Schellingstr. 4, München, D-80799, Germany Kavli Institute for Theoretical Physics, University of California, Santa Barbara, CA 93106-4030, United States Export Date: 19 September 2022 Correspondence Address: Grabarits, A.; MTA-BME Quantum Dynamics and Correlations Research Group, Műegyetem rkp. 3., Hungary; email: grabarits.andras.jozsef@ttk.bme.hu AB - We present a universal theory of quantum work statistics in generic disordered non-interacting Fermi systems, displaying a chaotic single-particle spectrum captured by random matrix theory. We consider quantum quenches both within a driven random matrix formalism and in an experimentally accessible microscopic model, describing a two-dimensional disordered quantum dot. By extending Anderson’s orthogonality determinant formula to compute quantum work distribution, we demonstrate that work statistics is non-Gaussian and is characterized by a few dimensionless parameters. At longer times, quantum interference effects become irrelevant and the quantum work distribution is well-described in terms of a purely classical ladder model with a symmetric exclusion process in energy space, while bosonization and mean field methods provide accurate analytical expressions for the work statistics. Our results demonstrate the universality of work distribution in generic chaotic Fermi systems, captured by the analytical predictions of a mean field theory, and can be verified by calorimetric measurements on nanoscale circuits. LA - English DB - MTMT ER -