NMR Studies on Magnetization Plateaus in Dimer Spin Systems
... A rich variety of quantum phase transitions can be induced in simple dimer-singlet spin systems by applying magnetic field strong enough to suppress the energy gap to triplet excitations. While the field-induced triplet bosons generally undergo Bose condensation, resulting in an antiferromagnetic or ...
... A rich variety of quantum phase transitions can be induced in simple dimer-singlet spin systems by applying magnetic field strong enough to suppress the energy gap to triplet excitations. While the field-induced triplet bosons generally undergo Bose condensation, resulting in an antiferromagnetic or ...
Physics 882: Problem Set 4 Due Friday, February 7, 2003
... where Si is a spin-1/2 quantum spin operator, the sum runs over distinct nearest neighbor pairs as discussed in class, and J > 0. Assume that the spins lie on a lattice which can be divided into two sublattices, such that all the nearest neighbors of spins on one sublattice are spins on the other su ...
... where Si is a spin-1/2 quantum spin operator, the sum runs over distinct nearest neighbor pairs as discussed in class, and J > 0. Assume that the spins lie on a lattice which can be divided into two sublattices, such that all the nearest neighbors of spins on one sublattice are spins on the other su ...
Quantum phase transition - Condensed Matter Theory and Quantum
... HW1: Critical exponents in classical Landau mean field theory ...
... HW1: Critical exponents in classical Landau mean field theory ...
Finite T Dynamics of 1D Integrable Systems
... We want to analytically continue for real times. The first step: transform the sum into a contour integral. Then each term of the sum becomes a sum of integrals – this looks like thermal formfactor expansion: ...
... We want to analytically continue for real times. The first step: transform the sum into a contour integral. Then each term of the sum becomes a sum of integrals – this looks like thermal formfactor expansion: ...
Hamiltonian of the quantum and classical Ising model with skew
... ~ = S(S + 1), S = 1/2, 1, 3/2, · · · ∞. spin S matrices, with norm ||S|| The chain has N spatial sites and satisfies periodic spatial boundary conditions. The coupling strength J between first-neighbor z-components of spin can either be positive (antiferromagnetic case) or negative (ferromagnetic ca ...
... ~ = S(S + 1), S = 1/2, 1, 3/2, · · · ∞. spin S matrices, with norm ||S|| The chain has N spatial sites and satisfies periodic spatial boundary conditions. The coupling strength J between first-neighbor z-components of spin can either be positive (antiferromagnetic case) or negative (ferromagnetic ca ...
PHYS 355 Thermal Physics Problem Set #8
... PHYS 355 Thermal Physics Problem Set #8 After you finish this problem set, you should be familiar with: Microcanonical Ensemble Ising model Paramagnet ...
... PHYS 355 Thermal Physics Problem Set #8 After you finish this problem set, you should be familiar with: Microcanonical Ensemble Ising model Paramagnet ...
MS WORD - Rutgers Physics
... transition of a neutral system, like 4He, are in the same universality class. Onsager and Feynman envisioned long time ago that the superfluid to normal transition can be understood as a proliferation of U(1) vortex loops. We will see that the proliferation of Z6 vortex loops that has been recently ...
... transition of a neutral system, like 4He, are in the same universality class. Onsager and Feynman envisioned long time ago that the superfluid to normal transition can be understood as a proliferation of U(1) vortex loops. We will see that the proliferation of Z6 vortex loops that has been recently ...