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M. E. Zayed

As seen in: Nature, Nature Physics
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Articles by M. E. Zayed

A quantum magnetic analogue to the critical point of water

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By J. Jimenez, M. E. Zayed, E. Fogh, R. Lortz
| Nature Verified
Abstract At the liquid–gas phase transition in water, the density has a discontinuity at atmospheric pressure; however, the line of these first-order transitions defined by increasing the applied pressure terminates at the critical point1, a concept ubiquitous in statistical thermodynamics2.
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4-spin plaquette singlet state in the Shastry-Sutherland compound SrCu2(BO3)2

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By J. J, M. E. Zayed, C. Panagopoulos, S. S. Saxena
| Nature Physics Verified
In the field of quantum magnetism, geometrically frustrated lattices generally imply major difficulties in analytical and numerical studies. For very few particular topologies, however, it has been shown that the ground state, at least, can be calculated exactly as for the Majumdar–Ghosh model15 that solves the J ? J zigzag chain when J = 2J . In two dimensions, the Shastry–Sutherland model2 consisting of an orthogonal dimer network of spin S = 1/2 was developed to be exactly solvable.
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