Topic
Spin-½
About: Spin-½ is a research topic. Over the lifetime, 40423 publications have been published within this topic receiving 796639 citations.
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TL;DR: In this paper, a quantum Monte Carlo method for tensor and other spin interactions such as those that are commonly encountered in nuclear structure calculations is described. But the main ingredients are a Hubbard-Stratonovich transformation to uncouple the spin degrees of freedom along with a fixed node approximation to maintain stability.
137 citations
TL;DR: An electron spin resonance (ESR) study on single crystals of the heavy fermion metal YbRh2Si2 which shows pronounced non-Fermi liquid behavior related to a close antiferromagnetic quantum critical point is reported.
Abstract: Sinuclear magneticresonance (NMR) Knight shift [3]] and dynamic (muonspin relaxation [4]). Two competing theoretical scenarioshave been advanced to describe the heavy electron QCP: aspin density wave scenario [5,6] and a localized momentscenario [7]. In the former scenario magnetism developsby the spin polarization of the Fermi surface and NFLbehavior results from the scattering of the quasiparticlesby quantum critical spin fluctuations. The localized mo-ment scenario assumes that heavy electrons are boundstates between the local moments and conduction elec-trons which disintegrate at the QCP. In YbRh
137 citations
TL;DR: Two point contacts, acting as a monochromatic source of ballistic holes and a narrow detector arranged in the magnetic focusing geometry are demonstrated to work as a tunable spin filter.
Abstract: Charged carriers with different spin states are spatially separated in a two-dimensional hole gas. Because of strong spin-orbit interaction, holes at the Fermi energy in GaAs have different momenta for two possible spin states traveling in the same direction, and, correspondingly, different cyclotron orbits in a weak magnetic field. Two point contacts, acting as a monochromatic source of ballistic holes and a narrow detector arranged in the magnetic focusing geometry are demonstrated to work as a tunable spin filter.
137 citations
TL;DR: In this article, the spin-phonon coupling leading to spin relaxation in the prototypical mononuclear single molecule magnet (tpaPh)Fe− was investigated and the nature of the most relevant vibrational modes giving rise to the relaxation was analyzed in detail.
Abstract: We perform a systematic investigation of the spin-phonon coupling leading to spin relaxation in the prototypical mononuclear single molecule magnet [(tpaPh)Fe]−. In particular we analyze in detail the nature of the most relevant vibrational modes giving rise to the relaxation. Our fully ab initio calculations, where the phonon modes are evaluated at the level of density functional theory and the spin-phonon coupling by mapping post-Hartree–Fock electronic structures onto an effective spin Hamiltonian, reveal that acoustic phonons are not active in the spin-phonon relaxation process of dilute SMMs crystals. Furthermore, we find that intra-molecular vibrational modes produce anisotropy tensor modulations orders of magnitude higher than those associated to rotations. In light of these results we are able to suggest new designing rules for spin-long-living SMMs which go beyond the tailoring of static molecular features but fully take into account dynamical features of the vibrational thermal bath evidencing those internal molecular distortions more relevant to the spin dynamics.
137 citations
137 citations