Zobrazeno 1 - 10
of 200
pro vyhledávání: '"Anders W. Sandvik"'
Publikováno v:
npj Quantum Materials, Vol 7, Iss 1, Pp 1-11 (2022)
Abstract Using quantum Monte Carlo, exact diagonalization, and perturbation theory, we study the spectrum of the S = 1/2 antiferromagnetic Heisenberg trimer chain by varying the ratio g = J 2/J 1 of the intertrimer and intratrimer coupling strengths.
Externí odkaz:
https://doaj.org/article/4a3bf9f468f54a6b8c806ed4a67a292e
Autor:
Jun Takahashi, Anders W. Sandvik
Publikováno v:
Physical Review Research, Vol 2, Iss 3, p 033459 (2020)
We introduce a quantum spin-1/2 model with many-body correlated Heisenberg-type interactions on the two-dimensional square lattice, designed so that the system can host a fourfold degenerate plaquette valence-bond solid (PVBS) ground state that spont
Externí odkaz:
https://doaj.org/article/4e9e5dc7ca544db5a326abdbf23096d1
Publikováno v:
Physical Review X, Vol 8, Iss 4, p 041040 (2018)
We study the effects of disorder (quenched randomness) in a two-dimensional square-lattice S=1/2 quantum-spin system, the J-Q model with a multispin interaction Q supplementing the Heisenberg exchange J. In the absence of disorder, the system hosts a
Externí odkaz:
https://doaj.org/article/e9f9bdc3dec4468da78232d744148718
Publikováno v:
Physical Review X, Vol 7, Iss 4, p 041072 (2017)
We study the spin-excitation spectrum (dynamic structure factor) of the spin-1/2 square-lattice Heisenberg antiferromagnet and an extended model (the J-Q model) including four-spin interactions Q in addition to the Heisenberg exchange J. Using an imp
Externí odkaz:
https://doaj.org/article/8100b95ccd7c4ba383344cf1afe8dab8
Autor:
Yan Qi Qin, Yuan-Yao He, Yi-Zhuang You, Zhong-Yi Lu, Arnab Sen, Anders W. Sandvik, Cenke Xu, Zi Yang Meng
Publikováno v:
Physical Review X, Vol 7, Iss 3, p 031052 (2017)
Recently, significant progress has been made in (2+1)-dimensional conformal field theories without supersymmetry. In particular, it was realized that different Lagrangians may be related by hidden dualities; i.e., seemingly different field theories m
Externí odkaz:
https://doaj.org/article/8fc5ecdf5a2c421189f904e9d641b574
Autor:
Andrew D. King, Jack Raymond, Trevor Lanting, Richard Harris, Alex Zucca, Fabio Altomare, Andrew J. Berkley, Kelly Boothby, Sara Ejtemaee, Colin Enderud, Emile Hoskinson, Shuiyuan Huang, Eric Ladizinsky, Allison J. R. MacDonald, Gaelen Marsden, Reza Molavi, Travis Oh, Gabriel Poulin-Lamarre, Mauricio Reis, Chris Rich, Yuki Sato, Nicholas Tsai, Mark Volkmann, Jed D. Whittaker, Jason Yao, Anders W. Sandvik, Mohammad H. Amin
Publikováno v:
Nature. 617:61-66
Experiments on disordered alloys suggest that spin glasses can be brought into low-energy states faster by annealing quantum fluctuations than by conventional thermal annealing. Due to the importance of spin glasses as a paradigmatic computational te
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::4cb119e5626d6ce5305447ab6e97cdf8
https://doi.org/10.1038/s41586-023-05867-2
https://doi.org/10.1038/s41586-023-05867-2
Autor:
Yi Cui, Lu Liu, Huihang Lin, Kai-Hsin Wu, Wenshan Hong, Xuefei Liu, Cong Li, Ze Hu, Ning Xi, Shiliang Li, Rong Yu, Anders W. Sandvik, Weiqiang Yu
Publikováno v:
Science.
The deconfined quantum critical point (DQCP) represents a paradigm shift in quantum matter studies, presenting a “beyond Landau” scenario for order–order transitions. Its experimental realization, however, has remained elusive. Using high-press
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::f32e959db8083eef36572cf47dd01f6c
https://doi.org/10.1126/science.adc9487
https://doi.org/10.1126/science.adc9487
Autor:
Hui Shao, Anders W. Sandvik
We report multipronged progress on the stochastic averaging approach to numerical analytic continuation of quantum Monte Carlo data. With the sampled spectrum parametrized with delta-functions in continuous frequency space, a calculation of the confi
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::29aa0e50b62b9db332df864d457d4d75
Publikováno v:
Journal of Statistical Physics. 177:1077-1088
In 1987, Affleck, Kennedy, Lieb, and Tasaki introduced the AKLT spin chain and proved that it has a spectral gap above the ground state. Their concurrent conjecture that the two-dimensional AKLT model on the hexagonal lattice is also gapped remains o
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::fd3720a34a9b663a7c1e81db6c9425ca
https://doi.org/10.1007/s10955-019-02410-4
https://doi.org/10.1007/s10955-019-02410-4
Publikováno v:
Nature Physics. 15:678-682
In a quantum phase transition, the ground state and low-temperature properties of a system change drastically as some parameter controlling zero-point quantum fluctuations is tuned to a critical value. Like classical phase transitions driven by therm
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::80b5e48d381dfb090860a6adf327d6f0
https://doi.org/10.1038/s41567-019-0484-x
https://doi.org/10.1038/s41567-019-0484-x