Quantum phase transitions of the extended isotropic XY model with long-range interactions

نویسندگان
چکیده

برای دانلود رایگان متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

Phase Transitions in Quantum Spin Systems with Isotropic and Nonisotropic Interactions

A basic subtlety in the study of statistical mechanics is the following: In nature, we observe abrupt changes in certain basic physical quantities, such as the magnetization of a magnet, but the statistical mechanics of systems with finitely many degrees of freedom is typically real analytic in all external variables. The resolution of this apparent paradox is that the abrupt changes are only a...

متن کامل

Quasi-long-range order in the 2D XY model with random phase shifts

We study the square-lattice XY model in the presence of random phase shifts. We consider two different disorder distributions with zero average shift and investigate the low-temperature quasi-long-range order phase which occurs for sufficiently low disorder. By means of Monte Carlo simulations we determine several universal quantities which are then compared with the analytic predictions of the...

متن کامل

Phase transitions of the random-bond Potts chain with long-range interactions.

We study phase transitions of the ferromagnetic q-state Potts chain with random nearest-neighbor couplings having a variance Δ^{2} and with homogeneous long-range interactions, which decay with distance as a power r^{-(1+σ)}, σ>0. In the large-q limit the free-energy of random samples of length L≤2048 is calculated exactly by a combinatorial optimization algorithm. The phase transition stays fi...

متن کامل

Two phase transitions in the fully frustrated XY model.

The fully frustrated XY model on a square lattice is studied by means of Monte Carlo simulations. A Kosterlitz-Thouless transition is found at TKT ≈ 0.446, followed by an ordinary Ising transition at a slightly higher temperature, Tc ≈ 0.452. The non-Ising exponents reported by others, are explained as a failure of finite size scaling due to the screening length associated with the nearby Koste...

متن کامل

Phase transitions in the one-dimensional frustrated quantum XY model and Josephson-junction ladders

A one-dimensional quantum version of the frustrated XY (planar rotor) model is considered which can be physically realized as a ladder of Josephsonjunctions at half a flux quantum per plaquette. This system undergoes a superconductor to insulator transition at zero temperature as a function of charging energy. The critical behavior is studied using a Monte Carlo transfer matrix applied to the p...

متن کامل

ذخیره 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 Magnetism and Magnetic Materials

سال: 2011

ISSN: 0304-8853

DOI: 10.1016/j.jmmm.2010.08.027