Alternating Heisenberg Spin-1/2 Chains in a Transverse Magnetic Field
نویسندگان
چکیده
منابع مشابه
Magnetic impurities in half-integer-spin Heisenberg antiferromagnetic chains.
We study the efFect of an isolated impurity on the low-energy properties of a half-odd-integerspin Heisenberg antiferromagnetic chain using both numerical and conformal field theory techniques. The impurity corresponds to the substitution of a magnetic ion by a difFerent ion with the same or different spin, or else to the coupling of a magnetic impurity to a single spin on the chain. Depending ...
متن کاملIsing Chain in Regularly Alternating Transverse Field: Spin Correlation Functions
We consider the spin1 2 Ising chain in a regularly alternating transverse field to examine the effects of regular alternation on the quantum phase transition inherent in the quantum Ising chain. The number of quantum phase transition points strongly depends on the specific set of the Hamiltonian parameters but never exceeds 2p where p is the period of alternation. Calculating the spin correlati...
متن کاملSpin excitations in an anisotropic bond-alternating quantum s = 1 chain in a magnetic field: contrast to haldane spin chains.
Inelastic neutron scattering experiments on the S = 1 quasi-one-dimensional bond-alternating antiferromagnet Ni(C9D24N4)(NO2)ClO4 have been performed under magnetic fields below and above a critical field Hc at which the energy gap closes. Normal field dependence of Zeeman splitting of the excited triplet modes below Hc has been observed, but the highest mode is unusually small and smears out w...
متن کاملEnergy correlations in random transverse field Ising spin chains
The end-to-end energy-energy correlations of random transverse field quantum Ising spin chains are computed using a generalization of an asymptotically exact real space renormalization group (RG) previously introduced. Away from the critical point, the average energy-energy correlations decay exponentially with a correlation length that is the same as that of the spin-spin correlations. The typ...
متن کاملIsing spin glass in a transverse magnetic field.
We study the three-dimensional quantum Ising spin glass in a transverse magnetic field following the evolution of the bond probability distribution under Renormalisation Group transformations. The phase diagram (critical temperature Tc vs transverse field Γ) we obtain shows a finite slope near T = 0, in contrast with the infinite slope for the pure case. Our results compare very well with the e...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Journal of the Physical Society of Japan
سال: 2008
ISSN: 0031-9015,1347-4073
DOI: 10.1143/jpsj.77.024710