Particle Phenomenology in the 90's

Datta, Amitava; Ghose, Partha; Raychaudhuri, Amitava

doi:10.1142/9789814538701

Cited by 38 publications

(52 citation statements)

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“…For instance D has been extracted from the charmonium spectral functions described above [67], with results remarkably close to the one obtained in strongly coupled SUSY, eq.7.2. The diffusion coefficient D can also be extracted by pure gauge correlators [75]: results for this have been presented by Datta [76]. Again the result is close to the one of eq.7.2, hence in remarkable agreement with those from Ref.…”

Section: Quark Gluon Plasma Confronts Experimentssupporting

confidence: 87%

High Temperature QCD

Lombardo¹

2012

Proceedings of the 30th International Symposium on Lattice Field Theory — PoS(Lattice 2012)

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I review results on QCD at high temperature since lat year lattice conference. Topics include steady progress with staggered fermions and new developments with Wilson type fermions, either in the Quark Gluon Plasma phase, and in the transition region. Simulations with chiral quarks are coming of age,and togheter with theoretical developments trigger interesting developments in the analysis of the critical region. Issues related with the universality class of the chiral transition and the fate of the axial symmetry are discussed in the light of new numericaland analytical results. Transport coefficients and analysis of bottomonium spectra compare well with results of heavy ion collisions at RHIC and LHC. Model field theories, lattice simulations and high temperature systematic expansions help building a coherent picture of high temperature QCD. The (strongly coupled) Quark Gluon Plasma is heavily investigated, and asserts its role of inspiring theoretical laboratory.

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Section: Quark Gluon Plasma Confronts Experimentssupporting

confidence: 87%

High Temperature QCD

Lombardo¹

2012

Proceedings of the 30th International Symposium on Lattice Field Theory — PoS(Lattice 2012)

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“…[16,17,61], which treat the cases of oxo-centered III 3 Mn triangles and coupled hexanuclear III 3 2 [Mn ] in some detail (see structures in Fig. 1).…”

Section: The Connection Between D Mol and D Ionmentioning

confidence: 99%

Magnetic quantum tunneling: insights from simple molecule-based magnets

et al. 2010

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This perspectives article takes a broad view of the current understanding of magnetic bistability and magnetic quantum tunneling in single-molecule magnets (SMMs), focusing on three families of relatively simple, low-nuclearity transition metal clusters: spin S = 4 II 4 Ni , III 3 Mn (S = 2 and 6) and III 6 Mn (S = 4 and 12). The Mn III complexes are related by the fact that they contain triangular III 3 Mn units in which the exchange may be switched from antiferromagnetic to ferromagnetic without significantly altering the coordination around the Mn III centers, thereby leaving the single-ion physics more-or-less unaltered. This allows for a detailed and systematic study of the way in which the individual-ion anisotropies project onto the molecular spin ground state in otherwise identical low-and high-spin molecules, thus providing unique insights into the key factors that control the quantum dynamics of SMMs, namely: (i) the height of the kinetic barrier to magnetization relaxation; and (ii) the transverse interactions that cause tunneling through this barrier. Numerical calculations are supported by an unprecedented experimental data set (17 different compounds), including very detailed spectroscopic information obtained from high-frequency electron paramagnetic resonance and low-temperature hysteresis measurements. Comparisons are made between the giant spin and multi-spin phenomenologies. The giant spin approach assumes the ground state spin, S, to be exact, enabling implementation of simple anisotropy projection techniques. This methodology provides a basic understanding of the concept of anisotropy dilution whereby the cluster anisotropy decreases as the total spin increases, resulting in a barrier that depends weakly on S. This partly explains why the record barrier for a SMM (86 K for Mn 6 ) has barely increased in the 15 years since the first studies of Mn 12 -acetate, and why the tiny Mn 3 molecule can have a barrier approaching 60% of this record. Ultimately, the giant spin approach fails to capture all of the key physics, although it works remarkably well for the purely ferromagnetic cases. Nevertheless, diagonalization of the multi-spin Hamiltonian matrix is necessary in order to fully capture the interplay between exchange and local anisotropy, and the resultant spin-state mixing which ultimately gives rise to the tunneling matrix elements in the high symmetry SMMs (ferromagnetic Mn 3 and Ni 4 ). The simplicity (low-nuclearity, high-symmetry, weak disorder, etc..) of the molecules highlighted in this study proves to be of crucial importance. Not only that, these simple molecules may be considered among the best SMMs: Mn 6 possesses the record anisotropy barrier, and Mn 3 is the first SMM to exhibit quantum tunneling selection rules that reflect the intrinsic symmetry of the molecule.

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“…Another approach, Ref. 31, tries to mimic standard NEGF when one works in the many-body states language ͑Fock space͒. Its main results, an analog of the Dyson and the Keldysh equa-tions of standard NEGF approach, are correct to the effective second order in system-bath interaction.…”

Section: Introductionmentioning

confidence: 99%

Transport in molecular states language: Generalized quantum master equation approach

2009

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A simple scheme, capable of treating transport in molecular junctions in the language of many-body states, is presented. By introducing an ansatz in Liouville space, similar to the generalized Kadanoff-Baym approximation, a quantum master equation ͑QME͒-like expression is derived starting from the exact equation of motion for Hubbard operators. Using an effective Liouville space propagation, a dressing similar to the standard diagrammatic one is proposed. The scheme is compared to the standard QME approach and its applicability to transport calculations is discussed.

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Particle Phenomenology in the 90's

Cited by 38 publications

References 0 publications

High Temperature QCD

High Temperature QCD

Magnetic quantum tunneling: insights from simple molecule-based magnets

Transport in molecular states language: Generalized quantum master equation approach

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