Prof. Atindra Nath Das

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Personal Info

Contact Information
Permanent Address:Theoretical Condensed Matter Physics (TCMP)
Saha Institute of Nuclear Physics (SINP)
1/AF Bidhannagar, Kolkata 700 064, INDIA
Ph. No.: +91-033-2337-0379 ext.2454
Fax No.: +91-033-2337-4637
e-mail: atindranath[dot]das[at]saha[dot]ac[dot]in


Research Interest

Interested in the following fields of research

  1. Boson Condensation in Optical Lattices
  2. High-Tc Systems and Collosal Magnetoresistance Systems
  3. Polarons
  4. Superconductivity
  5. Structural Transition

Papers in Journals

Publications in Referred Journals:

  1. A. N. Das and S. Sil, Thermodynamic properties of Holstein polarons and the effects of disorder, J. Phys.: Condens. Matter 20, 345222 (2008).

  2. R. Ramakumar and A. N. Das, Lattice Bosons in quartic confinement, Eur. Phys. J. D 47, 203 (2008).

  3. R. Ramakumar, A. N. Das and S. Sil, Studies of Bosons in optical lattices in a harmonic potential, Eur. Phys. J. D 42, 309 (2007).

  4. R. Ramakumar and A. N. Das, Specific heat of Bosons in a lattice, Phys. Letts. A 348, 304 (2006).

  5. A. N. Das and S. Sil, Effect of disorder on polaronic properties of a 1-d lattice, Phys. Letts. A 348, 266 (2006).

  6. R. Ramakumar and A. N. Das, Bose-Einstein condensation in tight-binding bands, Phys. Rev. B 72, 094301 (2005).

  7. Jayita Chatterjee and A. N. Das, Effect of different site energies on polaronic properties in the two-site single polaron Holstein model, Eur. Phys. J. B 46, 481 (2005).

  8. Jayita Chatterjee and A. N. Das, Two-site two-electron generalized Hubbard-Holstein Model: a perturbation study, Solid State Communications 129, 273 (2004).

  9. Jayita Chatterjee and A. N. Das, Role of the superexchange interaction in magnetic transition and polaron crossover, Physica B 348, 89 (2004).

  10. Marco Zoli and A. N. Das, Polaron crossover in molecular solids, J. Phys.: Condens. Matter 16, 3597 (2004).

  11. R. Ramakumar and A. N. Das, Polaron cross-overs and d-wave super- conductivity in Hubbard-Holstein model, Eur. Phys. J. B. 41, 197 (2004).

  12. J. Chattarjee, A. N. Das and P. Choudhury, Perturbation expansion using a variational phonon basis for Holstein model, Solid State Communications 126, 113 (2003).

  13. P. Choudhury and A. N. Das, Small to large polaron crossover in one dimension using variational phonon averaging techniques, Int. J. Mod. Phys. B 15, 1923 (2001).

  14. A. N. Das, J. Chatterjee and M. Mitra , A convergent perturbation method for the Holstein model and its application to the double exchange system, Int. J. Mod. Phys. B 15, 2647 (2001).

  15. B. Banyopadhyay, B. Chattopadhyay, A. N. Das and B. Ghosh, Structural distortions and extension of superconducting region in the $T_c-p$ phase diagram of $HgBa_2CuO_{4+\delta}$, Physica C 349, 119 (2001).

  16. J. Chatterjee, M. Mitra and A. N. Das, Magnetic transition and polaron crossover in a two-site single polaron model including double exchange interaction, Euro. Phys. Jour. B 18, 573 (2000).

  17. J. Chatterjee and A. N. Das, Comparison of perturbative expansions using different phonon bases for the two-site Holstein model, Phys. Rev. B61, 4592 (2000).

  18. Biplab Chattopadhyay, B Chattopadhyay, Asok Poddar, P Mandal, A. N. Das and B Ghosh, Impurity substitution in bismuth and thallium cuprates: suppression of Tc and estimation of pseudogap, Physica C 331, 38 (2000).

  19. J. Chatterjee and A. N. Das, First excited state calculation using different phonon bases for the two-site Holstein model, Int. J. Mod. Phys. B 14, 2577 (2000).

  20. A. N. Das and Jayita Chatterjee, Two-site polaron problem: a perturbation approach with variational basis states, Int. J. Mod. Phys. B 13, 3903 (1999).

  21. Biplab Chattopadhyay and A. N. Das, Effects of c-axis hopping in the interlayer tunneling model for cuprate superconductors, Int. J. Mod. Phys. B 13, 1619 (1999).

  22. A. N. Das and Biplab Chattopadhyay, An extended pair tunneling model: studies of bilayer splitting and some superconducting state properties, Physica C 308, 226 (1998).

  23. Biplab Chattopadhyay and A. N. Das, Superconducting gap within a modified interlayer tunneling model, Phys. Letts. A 246, 201 (1998).

  24. A. N. Das and S. Sil, Restricted pair tunneling model in the context of high-$T_c$ cuprates, Physica C 299, 83 (1998).

  25. Sujit Sarkar and A. N. Das, Isotope-shift exponent and the gap ratio for d-wave pairing within the phonon-mediated mechanism, Int. J. Mod. Phys. B 12, 1097 (1998).

  26. A. N. Das, Joydev Lahiri and S. Sil, Superconducting gap ratio and isotope-shift exponent in a pair-tunneling model, Physica C 294, 97 (1998).

  27. Biplab Chattopadhyay, Joydev Lahiri and A. N. Das, Differntial Conductance for Tunnel Junctions: Effects of d-wave Gap, Mod. Phys. Letts. B 11, 1285 (1997).

  28. S. Sil and A. N. Das, d-wave superconductivity in narrow-band systems: the effect of second-nearest-neighbor hopping, isotope effect and the pressure effect, J. Phys.: Condens. Matter 9, 3889 (1997).

  29. Sujit Sarkar and A. N. Das, Specific heat and Knight shift of cuprates within the van Hove scenario, Phys. Rev. B 54, 14974 (1996).

  30. Sourabh Banerjee and A. N. Das, Isotopic mass and pressure dependent changes for extended s-wave superconductors, J. Phys.: Condens. Matter 8, 11131 (1996).

  31. A. N. Das and Sujit Sarkar, The superconducting gap ratio isotope-shift exponent and pressure coefficient of Tc for high-Tc systems, Physica B 224, 548 (1996).

  32. Sourabh Banerjee, A. N. Das and D. K. Ray, Isotope-shift exponent in the polaronic model of superconductors, Phys. Letts. A. 214, 89 (1996).

  33. J. B. Mandal, A. N. Das and B. Ghosh, Scaling of the thermoelectric power in the $Bi_2Sr_2Ca_{(1-x)}Y_{x}Cu_2O_{8+y}~ (0<x<0.7)$ and $Tl_2Ba_2Ca_{(1-x)}Y_xCu_2O_{(8+y)}$ ($0<x<0.6$) systems, J. Phys.: Condens. Matter 8, 3047 (1996).

  34. P. Choudhury and A. N. Das, Polarons and bipolarons in a four-site periodic chain of spinless fermions, Phys. Rev. B. 53, 3203 (1996).

  35. Sujit Sarkar, S. Basu and A. N. Das, Pressure coefficient of the superconducting transition within the van Hove scenario, Phys. Rev. B. 52, 12545 (1995).

  36. Sujit Sarkar, S. Basu, A. N. Das, Role of orthorhombic distortion, second-nearest-neighbor hopping, and Coulomb repulsion on the superconducting transition temperature and isotope-shift exponent, Phys. Rev. B 51 12854 (1995).

  37. A. N. Das, Superconductivity in cuprate oxide systems, Indian J. Phys. 69A, 1 (1995).

  38. A. N. Das and P. Choudhury: Stability and nature of polarons in a two-site two-electron model, Phys. Rev. B 49, 13219 (1994).

  39. Sujit Sarkar and A. N. Das: Isotope-shift exponent, pressure coefficient of $T_c$ and the superconducting-gap ratio within the van Hove scenario, Phys. Rev. B 49, 13070 (1994).

  40. A. N. Das, Sujit Sarkar and P. Choudhury : Superconducting phase diagram of a narrow-band system at T = 0 : A mean field study, Phys. Rev. B 48, 16673 (1993).

  41. A. N. Das and S. Sil : A study of the polaronic band width and the small-to-large polaron transition in a many-polaron system, J. Phys.: Condens. Matter 5, 8265 (1993).

  42. S. Keshari, J. B. Mandal, P.Mandal, A. Poddar, A. N. Das and B.Ghosh : Thermoelectric Power of the Tl$_2$Ba$_2$Ca$_{1-x}$Y$_x$Cu$_2$O$_{8+y}$ ($0<x<0.6$) samples, Phys. Rev.B 47, 9048 (1993).

  43. A. N. Das and S. Sil : Small to large polaron transition in strongly correlated systems, Physica C 207, 51 (1993).

  44. P. Mandal, A. Poddar, P.Choudhury, J. B. Mandal, S. Kesari, A. N.Das and B. Ghosh : Transport, optical properties and superconductivity in Bi- and Tl- systems, Indian J. Pure and Appl. Phys. 30, 531 (1992).

  45. J. B. Mandal, S. Kesari, P.Mandal, A. Poddar, A.N.Das and B.Ghosh : Thermoelectric Power of Bi$_2$Sr$_2$Ca$_{1-x}$Y$_x$Cu$_2$O$_{8+y}$ (x= 0-1.0) system, Phys. Rev.B 46, 11840 (1992).

  46. J. Konior and A. N. Das: Polaronic band-width for a strongly correlated Hubbard system, Physica C 174, 215 (1991).

  47. A. N. Das, J. Konior, D. K. Ray and A. M. Oles: Superconductivity in a strongly correlated anisotropic 3-dimensional system, Phys. Rev. B 44, 7680 (1991).

  48. A. Poddar, P. Mandal, A. N. Das, B. Ghosh and P.Choudhury : Effect of carrier concentration on the normal transport properties and the superconducting transition temperature in the Tl$_2$Ba$_2$Ca$_{1-x}$Y$_x$Cu$_2$O$_{8+y}$ system, Phys. Rev. B 44, 2757 (1991).

  49. D. K. Ray, J. Konior, A. M. Oles and A. N. Das : Superconductivity in an anisotropic three-dimensional narrow band system, Phys. Rev. B 43, 5606 (1991).

  50. A. N. Das, J. Konior and D. K. Ray: Hole-phonon interaction in a strongly correlated Hubbard system, Physica C 170, 215 (1990).

  51. P. Mandal, A. Poddar, A. N. Das, B. Ghosh and P. Choudhury: Excess conductivity and thermally activated dissipation studies in Bi$_2$Sr$_2$Ca$_1$Cu$_2$O$_x$ single crystals, Physica C 169, 43 (1990).

  52. A. Poddar, P. Mandal, A. N. Das, B. Ghosh and P. Choudhury: Electrical resistivity, magnetoresistance, magnetisation, Hall coefficient and excess conductivity in Pb doped Bi-Sr-Ca-Cu oxides, Physica C 161, 567 (1989).

  53. A. N. Das and S. Sil : Electron-phonon interaction in a strongly correlated Hubbard system, Physica C 161, 325 (1989).

  54. P. Mandal, A. Poddar, A. N. Das, B. Ghosh and P. Choudhury : Hall effect of Bi-Sr-Ca-Cu-O and Tl-Ba-Ca-Cu-O systems, Phys. Rev. B 40, 730 (1989).

  55. A. Poddar, P. Mandal, A. N. Das, B. Ghosh and P. Choudhury: Excess conductivity in Tl$_1$Ca$_3$Ba$_1$Cu$_3$O$_x$ and Bi$_1$Ca$_1$Sr$_1$Cu$_2$O$_x$ systems due to thermodynamic fluctuations, Physica C 159, 231 (1989).

  56. A. Poddar, P. Mandal, K. Ghosh Ray, A. N. Das, B. Ghosh, P. Choudhury and S. K. Lahiri: Electrical resistance, magnetoresistance, magnetisation and 205-Tl NMR studies in Tl-Ca-Ba-Cu-O system, Physica C 159, 226 (1989).

  57. A. N. Das, B. Ghosh and P. Choudhury: Superconductivity, antiferromagnetism, Hall coefficient and the thermoelectric power for a single-band Hubbard model, Physica C 158, 311 (1989).

  58. A. N. Das, P. Choudhury and B. Ghosh : Superconductivity in the nearly half-filled Hubbard model with strong on-site correlation, Int. J. Mod. Phys. B 1, 567 (1988).

  59. P. Mandal, A. Poddar, A. N. Das, A. Chakraborty, B. Ghosh, P. Choudhury and S K Lahiri: Magnetoresistance and thermoelectric power of the Bi-Sr-Ca-Cu-O system, Phys. Rev. B 38, 9205 (1988).

  60. A. N. Das, P. Mandal, P. Choudhury and B. Ghosh: Susceptibility and specific-heat on the directionally anisotropic Heisenberg antiferromagnets, Phys. Rev. B 38, 4716 (1988).

  61. A. Poddar, P. Mandal, P. Choudhury, A. N. Das and B. Ghosh: Superconductivity in $ABa_2Cu_3O_{7-x}$ compounds : where A = (R1)$_x$(R2)$_{(1-x)}$ and R1, R2 = Y, Sm, Eu, Gd, Tb, Dy, Yb, Zr and Nb, J. Phys. C: Solid State Phys. 21, 3323 (1988).

  62. P. Choudhury, A. K. Sukla, H. S. Mavi, K. P. Jain, S. C. Abbi, P. Mandal, A. Poddar, A. N. Das and B. Ghosh: Raman Study of the High-$T_c$ superconductors ABa$_2$Cu$_3$O$_{7-x}$ (A = Y, Ho, Y$_{0.1}$Gd$_{0.9}$ and Y$_{0.9}$Sm$_{0.1}$), J. Phys. C: Solid State Phys. 21, L41 (1988).

  63. P. Mandal, A. Poddar, P. Choudhury, A. N. Das and B. Ghosh: Superconductivity in YBa$_2$Cu$_{3-y}$M$_y$O$_{7-x}$ systems where M = Zn, Ni and Co, J. Phys. C: Solid State Phys. 20, L953 (1987).

  64. P. Mandal, A. Poddar, P. Choudhury, A. N. Das and B. Ghosh : Superconductivity in Y-Ba-Cu-O systems, J. Phys. C: Solid State Phys. 20, L553 (1987).

  65. A. Poddar, P. Mandal, P. Choudhury, A. N. Das and B. Ghosh: Superconductivity in Y$_{0.1}$Gd${0.9}$Ba$_2$Cu$_3$O$_{8-\delta}$ and HoBa$_2$Cu ALT="$_3$">O$_{8-\delta}$ systems, J. Phys.C: Solid State Phys.20, L669 (1987).

  66. P. Choudhury, P. Mandal, A. N. Das and B. Ghosh : Dielectric behaviour and thermal expansions of ZnTiF$_6$.6H$_2$O/6D$_2$O and MnTiF$_6$.6H$_2$O/6D$_2$O crystals, J. Phys. C:Solid State Phys. 19, 3961 (1986).

  67. A. N. Das, P. Choudhury and B. Ghosh : An explanation of the change in frequency and linewidth of the symmetric stretching vibration $\nu_s$(H$_2$O) in ZnTiF$_6$.6H$_2$O and MnTiF$_6$.6H$_2$O near the transition point, J. Phys. C: Solid State Phys. 18, 5975 (1985).

  68. A. N. Das and B. Ghosh : Effect of pressure on the thermal hysteresis of a first order transition, J. Phys. C: Solid State Phys. 16, 1799 (1983).

  69. A. N. Das and B. Ghosh: Effect of third- and fifth-order coupling terms on the spontaneous strain of a second-order structural phase transition, J. Phys. C: Solid State Phys. 16, 1803 (1983).

  70. P. Choudhury, A. N. Das, N. Chatterjee and B. Ghosh : Anomalous dielectric properties of CoSiF$_6$.6H$_2$O (CFSH) near its transition temperature, Ind. J. Pure and Appl. Phys. 20, 241 (1982).

  71. G. K. Roy and A. N. Das: Mode damping by electrostrictive interaction in a uniaxial ferroelectric, Phys. Stat. Sol. (b) 96, 727 (1979)

  72. B. Ghosh, N. Chatterjee, A. N. Das and A. Chatterjee: An anomalous electrical property of CoSiF$_6$.6H$_2$O near its transition temperature, J. Phys. C: Solid State Phys. 12, 3283 (1979).

  73. G. K. Roy, A. N. Das and B. Ghosh: Acoustic attenuation near the transition point of a uniaxial ferroelectric, Phys. Letts. A 74, 132 (1979).

  74. B. Ghosh, N. Chatterjee, A. N. Das and S. C. Nath: Anomalous thermal expansion of CoSiF$_6$.6H$_2$O near its transition temperature, J. Phys. C: Solid State Phys. 11, L243 (1978).
  75. A. N. Das and B. Ghosh : Studies on the thermal expansion of a simple displacive type ferroelectric and the effect of pressure on its transition temperature, J. Phys. C: Solid State Phys. 11, 2483 (1978).

  76. B. Ghosh, N. Chatterjee, A. N. Das, S. K. DuttaRoy and A. Pal: Phase transition studies in CoSiF$_6$.6D$_2$O, J. Phys. C: Solid State Phys. 10, L527 (1977).

  77. S. K. DuttaRoy, A. Pal, B. Ghosh, N. Chatterjee and A. N. Das: Effect of pressure on the structural phase transition temperature in CoSiF$_6$.6H$_2$O and CoZrF$_6$.6H$_2$O, J. Phys. C: Solid State Phys. 10, L403 (1977).