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- Keivani Hafshejani, M. Sattari Naeini, A. Langari
- 2012

It is well established that the Myoelecterical prosthesis must also be effective, smart, light, strong and high permanence, compared to those of Mechanical prosthesis. It is time consuming and expensive that has ultimately led to significant increases in the price of Myoelecterical prosthesis. Therefore, considering the high cost of these prostheses should… (More)

- M Kargarian, R Jafari, A Langari
- 2008

We have applied our recent approach (Kargarian, et.al Phys. Rev. A 76, 60304 (R) (2007)) to study the quantum information properties of the anisotropic s=1/2 Heisenberg chain. We have investigated the underlying quantum information properties like the evolution of concurrence, entanglement entropy, nonanalytic behaviours and the scaling close to the quantum… (More)

- M Golshani, S Weimann, +6 authors A Szameit
- Physical review letters
- 2014

We analyze the impact of loss in lattices of coupled optical waveguides and find that, in such a case, the hopping between adjacent waveguides is necessarily complex. This results not only in a transition of the light spreading from ballistic to diffusive, but also in a new kind of diffraction that is caused by loss dispersion. We prove our theoretical… (More)

- Fakhrodin Alimoradi, Mohammad R. Aabaadiaan, Ameneh Langari, Mohsen Gh. Kharaji
- 2013

Composite materials are increasingly utilized in many civil engineering and medical applications such as conveying tubes and pipelines, making artificial human parts, dental applications, reinforcing structures, etc. The glass reinforced composite is one of the most common composite that is used for its good mechanical properties and also its rationally low… (More)

- R Haghshenas, A Langari, A T Rezakhani
- Journal of physics. Condensed matter : an…
- 2016

The phase diagram of the quantum compass ladder model is investigated through numerical density matrix renormalization group based on infinite matrix product state algorithm and analytic effective perturbation theory. For this model we obtain two symmetry-protected topological phases, protected by a Z2 × Z2 symmetry, and a topologically-trivial… (More)

- S Hemmatiyan, M Rahimi Movassagh, N Ghassemi, M Kargarian, A T Rezakhani, A Langari
- Journal of physics. Condensed matter : an…
- 2015

The Kondo-necklace model can describe magnetic low-energy limit of strongly correlated heavy fermion materials. There exist multiple energy scales in this model corresponding to each phase of the system. Here, we study quantum phase transition between the Kondo-singlet phase and the antiferromagnetic long-range ordered phase, and show the effect of… (More)

- G I Japaridze, A Langari, S Mahdavifar
- Journal of physics. Condensed matter : an…
- 2007

We have studied the ground-state phase diagram of a two-leg spin ladder with anisotropic ferromagnetic leg couplings under the influence of a symmetry-breaking transverse magnetic field by the exact diagonalization technique. In the case of antiferromagnetic coupling between legs we identified two phase transitions in the plane of magnetic field versus… (More)

- A. Langari
- 1996

A simple modification of the standard Renormalization Group (RG) technique for the study of quantum spin systems is introduced. Our method which takes into account the effect of boundary conditions by employing the concept of superblock, may be regarded as a simple way for obtaining first estimates of many properties of spin systems. By applying this method… (More)

- Ameneh Langari, Mohammad R. Aabadiaan, Fakhrodin Alimoradi, Ahmad Fakhkhar, Azam Beigi Kheradmand, Mohsen Gh. Kharaji
- 2013

Epoxy is used in many dental and medical applications such as manufacturing prostheses. This polymer is not toxic and is a good candidate for easily forming of artificial hand, leg, etc. In recent years, the recycled waste tire has been concerned as inexpensive modifier for improving the toughness characteristics of many thermoset resins such as epoxy.… (More)

- A Fledderjohann, A Langari, K.-H Mütter
- 2006

The emergence of phase separation is investigated in the framework of a 2D t− J model by means of a variational product ansatz, which covers the infinite lattice by two types of L × L clusters. Clusters of the first type are completely occupied with electrons, i.e. they carry maximal charge Qe = L 2 and total spin 0, and thereby form the antiferromagnetic… (More)