The heme-containing cytochrome P450s exhibit isoform-dependent ferric spin equilibria in the resting state and differential substrate-dependent spin equilibria. The basis for these differences is not well understood. Here, magnetic circular dichroism (MCD) reveals significant differences in the resting low spin ligand field of CYPs 3A4, 2E1, 2C9, 125A1, and 51B1, which indicates differences in ...

We study the exchange physics in high-spin Mott insulating systems with S=3/2 which is realizable in ultracold atomic systems. The high symmetry of SO 5 or SU 4 therein renders stronger quantum fluctuations than the usual spin-1 /2 systems. A spontaneous plaquette ground state without any site and bond spin orders is rigorously proved in a ladder spin-3 /2 model, whose topological excitations e...

J. K. Hwang,1 A. V. Ramayya,1 J. H. Hamilton,1 J. O. Rasmussen,2 Y. X. Luo,1,2 D. Fong,1 K. Li,1 C. Goodin,1 S. J. Zhu,1,3 S. C. Wu,2 M. A. Stoyer,4 R. Donangelo,5 X.-R. Zhu,6,7 and H. Sagawa6 1Physics Department, Vanderbilt University, Nashville, Tennessee 37235, USA 2Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA 3Department of Physics, Tsinghua University, Beijing 100...

We investigate the ground-state energy and spin of disordered quantum dots using spin-density-functional theory. Fluctuations of addition energies (Coulomb-blockade peak spacings) do not scale with average addition energy but remain proportional to level spacing. With increasing interaction strength, the even-odd alternation of addition energies disappears, and the probability of non-minimal sp...

Abstract. The mean number 〈N〉 of metastable states in higher order shortrange spin glasses is estimated analytically using a variational method introduced by Tanaka and Edwards for very large coordination numbers. For lattices with small connectivities, numerical simulations do not show any significant dependence on the relative positions of the interacting spins on the lattice, indicating thus...

D.F. Geesaman and B. Zeidman Argonne National Laboratory, Argonne, Illinois 60439 C. Olmer, A.D. Bacher, G.T. Emery, C.W. Glover, H. Nann and W.P. Jones Indiana University Cyclotron Facility, Bloomington, Indiana 47405 S .Y. van der Werf Kernfysisch Versneller Institut, Groningen, The Netherlands R.E. Segel Northwestern University, Evanston, Illinois 60204 R .A. Lindgren University of Massachus...

The emergence of half-integer filling-factor states, such as upsilon=5/2 and 7/2, is found in quantum dots by using numerical many-electron methods. These states have interesting similarities and differences with their counterstates found in the two-dimensional electron gas. The upsilon=1/2 states in quantum dots are shown to have high overlaps with the composite fermion states. The lower overl...

in a typical solitonic distribution, the soliton density is distributed over the entire moleculeand the present work shows how its density can be decomposed into solitonic and antisolitoniccomponents. it is found that there exists a unique electron as soliton over the anionicnanoconductor, while there are many other solitons and antisolitons. the solitonic states are furtherdecomposed to the ca...

The electronic spin and valence states of iron in lower-mantle silicate perovskite have been previously investigated at high pressures using various experimental and theoretical techniques. However, experimental results and their interpretation remain highly debated. Here we have studied a wellcharacterized silicate perovskite starting sample [(Mg0.9,Fe0.1)SiO3] in a chemically inert Ne pressur...