Zobrazeno 1 - 10
of 22
pro vyhledávání: '"Keola Wierschem"'
New magnetization plateaus and supersolid phases are identified in an extended Shastry–Sutherland model – with additional longer range interactions and exchange anisotropy – over a wide range of interaction parameters and an applied magnetic fi
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::63237a383f7ecd7ce32ad67531149b6d
https://hdl.handle.net/10356/137393
https://hdl.handle.net/10356/137393
Autor:
Stephen J. Blundell, Fan Xiao, Arzhang Ardavan, Kevin H. Stone, Jamie L. Manson, Hope E. Tran, Toby J. Woods, Saman Ghannadzadeh, Robert Williams, Peter J. Baker, J. S. Möller, Saul H. Lapidus, Junjie Liu, Jamie Brambleby, Jesper Bendix, John Singleton, Francesca Foronda, Paul Goddard, Peter W. Stephens, Kimberly E. Carreiro, Tom Lancaster, Keola Wierschem, Francis L. Pratt, Yoshimitsu Kohama, Cecelia J. Villa
Publikováno v:
Inorganic chemistry, 2016, Vol.55(7), pp.3515-3529 [Peer Reviewed Journal]
The crystal structures of NiX2(pyz)2 (X = Cl (1), Br (2), I (3), and NCS (4)) were determined by synchrotron X-ray powder diffraction. All four compounds consist of two-dimensional (2D) square arrays self-assembled from octahedral NiN4X2 units that a
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c310e96a602156cbf0c2cf0ac5c8b32d
https://ora.ox.ac.uk/objects/uuid:aaf6f911-5c60-4310-b4e5-53acf7f35e83
https://ora.ox.ac.uk/objects/uuid:aaf6f911-5c60-4310-b4e5-53acf7f35e83
Autor:
Kevin Beach, Keola Wierschem
The strange correlator [Phys. Rev. Lett. 112, 247202 (2014)] has been proposed as a measure of symmetry protected topological order in one- and two-dimensional systems. It takes the form of a spin-spin correlation function, computed as a mixed overla
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::0ad7786b44b4afb39d9909b94383dcc8
The XXZ model on a square lattice in the presence of a transverse magnetic field is studied within the spin wave theory to investigate the resulting canted antiferromagnet. The small and large field regimes are probed separately both for easy-axis an
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d6e5fd62a2dcd4804463453f4a086013
Autor:
Efstratios Manousakis, Keola Wierschem
Publikováno v:
Physics Procedia. 3:1515-1519
Monte Carlo studies of the melting transition of Lennard-Jones particles in two dimensions are reported. Focus is placed on the orientational order parameter, and an estimate of the orientational melting temperature is made from the Binder ratio as w
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c3b3bce84af89d0faae51207f18b59e9
https://doi.org/10.1016/j.phpro.2010.01.213
https://doi.org/10.1016/j.phpro.2010.01.213
Autor:
Tai Kong, Pinaki Sengupta, Paul C. Canfield, Toshimitsu Ito, Sai Sunku, Keola Wierschem, Christos Panagopoulos
We investigate the low temperature magnetic phases in TmB_4, a metallic quantum magnet on the geometrically frustrated Shastry-Sutherland lattice, using co-ordinated experimental and theoretical studies. Our results provide an explanation for the app
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b4321f48d141a9b07ba32857ba6b9f98
http://arxiv.org/abs/1506.04527
http://arxiv.org/abs/1506.04527
Autor:
Richard Bertram, Keola Wierschem
Publikováno v:
Journal of Theoretical Biology. 228:513-521
The electrical activity of insulin-secreting pancreatic islets of Langerhans is characterized by bursts of action potentials. Most often this bursting is periodic, but in some cases it is modulated by an underlying slower rhythm. We suggest that the
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::11051d6284e1401e536757ebbd16370b
https://doi.org/10.1016/j.jtbi.2004.02.022
https://doi.org/10.1016/j.jtbi.2004.02.022
Autor:
Keola Wierschem, Pinaki Sengupta
Publikováno v:
Physical Review B. 90
We study the behavior of the recently proposed "strange correlator" [Phys. Rev. Lett. {\bf 112}, 247202 (2014)] in spin-1 Heisenberg antiferromagnetic chains with uniaxial single-ion anisotropy. Using projective quantum Monte Carlo, we are able to di
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::8a2e33ddece604a23ea7d895774b1abd
https://doi.org/10.1103/physrevb.90.115157
https://doi.org/10.1103/physrevb.90.115157
We explore the field induced magnetic phases of an $S=1$ $XXZ$ model with single-ion anisotropy and large Ising-like anisotropy on a Shastry Sutherland lattice over a wide range of Hamiltonian parameters and applied magnetic field. The multitude of g
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::670b399cdd8b430d18e6ff67fa49b361
http://hdl.handle.net/10220/19888
http://hdl.handle.net/10220/19888
Autor:
Pinaki Sengupta, Keola Wierschem
We consider a quasi-one-dimensional system of spin-1 Heisenberg antiferromagnetic chains in 2D and 3D hypercubic lattices with interchain coupling $J$ and uniaxial single-ion anisotropy $D$. Using large scale numerical simulations, we map out the $J-
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::3fa4b9e1e89e4c88e4d0003418394d92