Výsledky vyhledávání - "Dipan K. Ghosh"

Graphical approach to correlations in high-spin systems

Autor: Charudatt Kadolkar, Dipan K. Ghosh, C. R. Sarma

Publikováno v: International Journal of Quantum Chemistry. 73:389-393

We present a graphical technique for generating and indexing spin monomials of high-spin systems. The procedure consists of developing a graph with at most n line segments from each node in a given row to the one immediately lower, where n is the mul

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::af7eee6ecc0b0b6c7ad3d504ed16d290
https://doi.org/10.1002/(sici)1097-461x(1999)73:5<389::aid-qua1>3.0.co

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Variational Monte Carlo study of a spin one quantum antiferromagnet on a fractal lattice

Autor: Dipan K. Ghosh, Latha S. Warrier

Publikováno v: Journal of Applied Physics. 95:6992-6994

A variational Monte Carlo calculation is made on a spin one Heisenberg antiferromagnet on a fractal lattice. Ground state energy and spin correlation functions are computed for a Sierpinski gasket containing up to 123 sites. The results indicate appr

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::fd7ada67fc55088afe076b00da4f3b96
https://doi.org/10.1063/1.1689131

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A scheme for representation matrices of a permutation group using spin-paired functions

Autor: C. R. Sarma, Dipan K. Ghosh, C. Kadolkar

Publikováno v: International Journal of Quantum Chemistry. 47:185-190

In the present note, a linked form of spin-paired functions for an N-electron system in spin state S is suggested. This is found to lead to a simple scheme for generating the representation matrices of the elements of permutation group without search

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::4381c8bd4f468c05696db780f8bffa56
https://doi.org/10.1002/qua.560470303

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Haldane gap in S = 2 XXZ quantum antiferromagnet

Autor: Sahana Murthy, Neena Goveas, Charudatt Kadolkar, Dipan K. Ghosh

Publikováno v: Journal of Magnetism and Magnetic Materials. :638-639

S = 2 quantum antiferromagnetic chains described by XXZ Heisenberg Hamiltonian with uniaxial anisotropy has been studied using DMRG technique. Chains of length up to 92 have been considered keeping 50 most significant states in the density matrix. Va

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::2820525cd035369f237bea693839c4b9
https://doi.org/10.1016/s0304-8853(97)00832-9

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Extended Hubbard model in 2 dimensions

Autor: Mukul Laad, Dipan K. Ghosh

Publikováno v: Journal of Magnetism and Magnetic Materials. :741-742

The extended Hubbard model with intersite coupling has been studied by mapping it onto an XXZ model without a magnetic field for the half-filled band case. The phases in the U-Q plane obtained here are in good agreement with the Monte Carlo simulatio

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::b8283aea97693329b0d9f8ec452cab62
https://doi.org/10.1016/0304-8853(92)91011-h

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Application of coherent potential approximation to Ni-rich Ni-Cu alloys

Autor: Partha Bhattacharyya, Dipan K. Ghosh

Publikováno v: Physical Review B. 11:2642-2650

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::67e0ce604316a2b504d5408ed44c8dd8
https://doi.org/10.1103/physrevb.11.2642

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Green's-Function Theory of an Antiferromagnet

Autor: Dipan K. Ghosh

Publikováno v: Physical Review B. 8:392-406

A Green's-function theory is developed for a Heisenberg antiferromagnet using a decoupling scheme which conserves the frequency moments of the spectral function. The method closely follows Tahir-Kheli's decoupling scheme for a ferromagnetic system, a

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::8b698a7d88ad201febed2c8831c1d827
https://doi.org/10.1103/physrevb.8.392

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Nonexistence of Magnetic Ordering in the One- and Two-Dimensional Hubbard Model

Autor: Dipan K. Ghosh

Publikováno v: Physical Review Letters. 27:1584-1587

It is shown that for nonzero temperature, Hubbard's narrow-energy-band model is neither ferromagnetic nor antiferromagnetic in one and two dimensions.

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::2ac4ff439c0667d22b9974b80245030c
https://doi.org/10.1103/physrevlett.27.1584

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On Next‐Nearest‐Neighbor Interaction in Linear Chain. II

Autor: Chanchal K. Majumdar, Dipan K. Ghosh

Publikováno v: Journal of Mathematical Physics. 10:1399-1402

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::2bafa9a5167140fb71cd4e59bf0df3e3
https://doi.org/10.1063/1.1664979

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On Next‐Nearest‐Neighbor Interaction in Linear Chain. I

Autor: Dipan K. Ghosh, Chanchal K. Majumdar

Publikováno v: Journal of Mathematical Physics. 10:1388-1398

Ground‐state properties of the Hamiltonian H=12J ∑ i=1N σi·σi+1 + 12Jα ∑ i=1N σi·σi+2 (σN+1 ≡ σ1, σN+2 ≡ σ2) are studied for both signs of J and −1 ≤ α ≤ 1 to gain insight into the stability of the ground state with neares

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::95819b6da2d024995ff01f1f6ccd7ae4
https://doi.org/10.1063/1.1664978

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