Deepak Kumar
Professor
School of Physical Sciences
Jawaharlal Nehru University
New Delhi  110067,India
 Telephone:  +91-11-26161907, 26717501 (office)   +91-11-26109903 (residence)
Fax:  +91- 11- 26717537
Email : dk0700@mail.jnu.ac.in; dkjnu@hotmail.com

 

Academic Record 

Higher Secondary

Delhi Board

1962

B.Sc Physics Hons.

Delhi University

1965

M.Sc Physics

Delhi University

1967

Ph.D

University of Pennsylvania

1972

 

Research Interests

Condensed  Matter Physics, Statistical Mechanics and Foundations of Quantum Mechanics

Within the above broad fields, my research work lies in the following areas:

  • Quantum Many-Body Physics: Magnetism, Superconductivity and Correlated Electron Systems

  • Phase Transitions and Critical Phenomenon, Nonequilibrium systems and Pattern Formation

  • Disordered Systems and Transport Theory

  • Foundations of Quantum Mechanics

Awards/ Honours

Shanti Swarup Bhatnagar Prize in Physical Sciences, 1988

Fellow, Indian Academy of Sciences, 1987

Associate/ Senior Associate, Abdus Salam International Centre of Theoretical Physics Since 1986

Alexander von Humboldt Fellow, 1978-79

Publications

Journals

1. Self-consistent damping of antiferromagnetic magnons, A.B.Harris and  D. Kumar , Bull. Am. Phys.Soc. 14, 409 (1969).  

2. Dynamics of an Antiferromagnet at low temperatures,  A.B. Harris, D. Kumar, B.I. Halperin and  P.C. Hohenberg, J. Appl. Phys.41, 1361 (1970).

3. Dynamics of an Antiferromagnet at low temperatures,  A.B. Harris, D. Kumar, B.I. Halperin and  P.C. Hohenberg, Phys. Rev. B3,961-1024, (1971).

4. Spin waves and long range order in a diluted Heisenberg ferromagnet, D. Kumar and A.B. Harris, AIP Conf. Proc. 5, 1345-50, (1972)

5. Spin waves and long range order in a diluted Heisenberg ferromagnet, D. Kumar and A.B. Harris, Phys. Rev. B8, 2166-84, (1973).

6. Electronic structure of disordered alloys : Generalized coherent potential approximation and effects of environment, V. Kumar, D.Kumar and S.K. Joshi,    Phys. Rev. B11, 3831-35, (1975).  

7. Probability distribution of magnetization in a random ferromagnet, D. Kumar, J. Phys. C8, L365-67 (1975).

8. Variation of critical temperature with concentration in a diluted ferromagnet, R. Bhargava and D. Kumar, J. Phys. C8, L478-82, (1975).

9. Critical Phenomenon in disordered systems: a renormalisation group approach, D. Kumar, A. Mookarjee and T.V. Ramakrishnan, Nuc. Phys.  Solid. State Phys. Symp. 18C, 448-449 (1976).

10. Surface segregation in binary alloys, D. Kumar, A. Mookarjee and V. Kumar, J. Phys. F6, 725-39 (1976). 

11. Two site spin correlation functions of Ising model in BPW approximation, D. Kumar, Pramana 7, 28-33 (1976).

12. Bicritical behaviour at percolation like transitions, D. Kumar, Nuc. Phys. Solid. State Phys. Symp. 19C, 328-330 (1976).

13. Thermodynamics of disordered Heisenberg models in a cluster approximation, R. Bhargava and D. Kumar, Phys. Rev. B14, 4002-08, (1976).

14. Electronic structure of disordered alloys : Environment effects, V. Kumar, D. Kumar and S.K. Joshi, J. Phys. C9, 2733-39 (1976).

15. Critical Phenomenon in disordered systems: a renormalisation group approach, D. Kumar, Phys. Rev. Lett. 37, 1171-74, (1976).

16. Short-range order and localisation, V.Srivastava, D. Kumar and S.K. Joshi, Solid State Comm., 21, 25-27 (1977).

17. Wavevector dependent susecptibility of an ising sping glass, R. Bhargava and D. Kumar, Solid State Comm., 22, 547-47 (1977).

18. Spin wave spectra of disordered ferromagnets in a cluster approximation, V. Kumar, D. Kumar and S.K. Joshi,  J. Phys. C10,1741-50 (1977).

19. Magnetization and susecptibility of a random Ising model, V.Srivastava, D. Kumar and S.K. Joshi, Pramana 9, 179-88 (1977).

20. On a recent theory of localization, V. Kumar, D. Kumar and S.K. Joshi, Solid State Comm., 24, 387-89 (1977).

21. Order parameter relaxation in spin glasses, D. Kumar and M. Barma, Phys. Letts 67A, 217-18 (1978).

22. Surface segregation in Ag-Au alloys : short range order, V. Kumar, D. Kumar and S.K. Joshi, Ind. J. Phys 53A, 197 (1979).

23. Surface segregation in non-regular alloys, V. Kumar, D. Kumar and S.K. Joshi, Phys. Rev. B19, 1954-62 (1979).

24. Excitation in spin glasses, R. Bhargava and D. Kumar, Phys. Rev. B19, 2764-74 (1979).

25. A position space renormalization group approach for the compressible Ising model, M. Barma and D. Kumar,  J. Phys. C12, 1331-47 (1979).

26.  Renormalization group calculations for the dilute Heisenberg model, M. Barma, D. Kumar and R.B. Pandey, J. Phys. C12, L283-87 (1979).

27. Calculation of percolation-thermal cross over index for the bond diluted Ising model, D. Kumar, J. Phys. C12, L599-603 (1979).

28. Comment on Migdal renormalization group approach to quantum spin systems, M. Barma,  R.B. Pandey and D. Kumar , J. Phys.C12, L909-13 (1979).

29.  Renormalisation group calculations for dilute Heisenberg model, M. Barma, D.Kumar and .R.B. Pandey, J. Mag. Mag. Mater.15-18, 245-246 (1980)

30.Numerical studies of relaxation in one-dimensional  Glauber chain, D.Kumar and J.Stein, J. Mag. Mag. Mater. 15-18, 225-226,(1980)

31. Relaxation of magnetisation in a one-dimensional  Glauber chain, D.Kumar and J.Stein, J. Phys. C13, 3011-25 (1980)

32. Critical properties of random magnetic systems, D. Kumar, Bull. Materials Science 1, 201-06 (1980)

33. Critical properties of diluted anisotropic magnets near percolation threshold,  D. Kumar, R.B. Pandey and M. Barma, Phys. Rev.B23, 2269-77 (1981).  

34. Fractal effects on excitations in dilute ferromagnets, D. Kumar, Phys. Rev. B25, 2069-71 (1982).

35. Patterns and universality in the study of chaos, D. Kumar, Phys. News. 13, 108-113 (1982)

36. Non-Equilibrium susecptibility of supermagnetic particles, D. Kumar and S. Dattagupta, J. Phys. C16, 3778-94 (1983).

37. Brownian motion of a quantum particle, D. Kumar, Phys. Rev. A29, 1571-73 (1984).

38. Influence of Nickel substitution in FeSb triangular antiferromagnetic system, K.C. Harchand, R. Kumar, Vishwamitter, D. Kumar and K. Chandra, Phys.Rev. B30, 1527-33 (1984).

39. Dynamic scaling for dilute magnets near percolation threshold.,  D. Kumar, Phys. Rev. B30, 2961-63 (1984).

40. Spin glasses: a new challenge in statistical physics,  D. Kumar, Current Science 53, 887-896 (1984)

41. A note on dynamic scaling of spin waves in dilute ferromagnets,  D. Kumar, Pramana 24, 559-62 (1985).

42. Spin waves and perpendicular susecptibility of a diluted anti-ferromagnet near percolation threshold,  D. Kumar and A.B. Harris, Phys. Rev. B32, 3251-62 (1985).

43. Hierarchical energy barriers, Hierarchical constraints and non-exponential decays in glasses, D. Kumar and S.R. Shenoy, Solid State Comm 57, 927-31 (1986).

44. Relaxation dynamics on a class of disordered ultrametric models, D. Kumar and S.R. Shenoy, Phys. Rev. B34, 3547-49 (1986).

45. Void nucleation under irradiation as a diffusive instability, D. Kumar and S.Ray, Phys. Rev. B34, 5048-57 (1986)

46. Mode Condensation in a hierarchical system, D. Kumar and Kamlesh, Phys. Rev. Letters 57, 3101-04 (1986)

47. Reality in quantum mechanics, D. Kumar and I. Singh, Physics Education 3, 34-41  (1987)

48. Relaxation and transition in general Huberman-Kerszberg models: a recursive variational approach, K. Kumari and  D. Kumar, Phys. Rev. B38, 11774-780  (1988)

49. Influence of Oxygen deficiency on the thermoelectric power of Y Ba Cu O, S.R. Jha, Y.S. Reddy, D.K. Suri, K.D. Kundra, R.G. Sharma and D.Kumar , Pramana 32, 277-87 (1989)

50. Thermodynamics of spin-glasses in the Hartree-Fock approximation, K. Kumari and  D. Kumar, Phys. Rev. B39, 12215-23, (1989)

51. A new formalism for the statistical dynamics of planar spin systems, K. Kumari and  D. Kumar, Pramana- J. Phys. 35, 115-25, (1990)

52. Thermoelectric power of inhomogenous superconductors: a new kind of percolation, R. Rajput and  D. Kumar,        Phys. Rev. B42, 8634-37 (1990)

53. Studies on thermoelectric power and percolation in BSSCO systems, S.R. Jha, R. Rajput, D. Kumar,  R.G. Sharma and Y.S. Reddy, Solid State Comm. 81, 603-607 (1992)

54. Optical mode coupling in a ring due to a partial reflector, A. Venugopalan, D. Kumar and R. Ghosh, Pramana-J. Phys. 40, 107-112, (1993)

55. The Heisenberg antiferromagnet with a low concentration of static defects, C.C. Wan, A.B. Harris and D. Kumar,  Phys. Rev. B48, 1036-61 (1993)

56. Thermoelectric power of doped BSSCO superconductors and marginal fermi liquid theory, R. Rajput, D. Kumar,  R.G. Sharma and Y.S. Reddy, J. Phys. Cond. Matter 5, 669-78 (1993)

57. Study of the nature of glass formation in organic binary mixtures using differential scanning calorimetery, S.S.N. Murthy and D. Kumar, J. Chem. Soc. Faraday Transac. 89, 2423-27 (1993)

58. Thermoelectric power of  High-T   superconductors: superconducting fluctuations and marginal fermi liquid theory,  D. Kumar, J. Phys. Cond. Matter 5,  8277-88 (1993)

59. Thermoelectric power studies on  BPSSCO systems with silver addition, R. Rajput,  Y.S. Reddy, R.G. Sharma,  G.V. Subbarao and  D. Kumar, Physica C: Superconductivity 213, 211-18 (1993)

60. Dynamics and finite size effects in two-dimensional lattices of planar dipoles, K.M.S. Bajaj, R. Mehrotra, D. Kumar and V. Soni, Europhys. Letters 27, 153-58 (1994)

61. A new formalism for the statistical dynamics of the vector spin systems, K. Kumari and  D. Kumar, Pramana- J. Phys. 43, 289-305 (1994)

62.  The quantum measurement problem: nature of the apparatus, A. Venugopalan, D. Kumar and R. Ghosh, Current Science 68, 62-67 (1995)

63. Environment-induced decoherence I: The Stern-Gerlach measurement, A. Venugopalan, D. Kumar and R. Ghosh, Physica A 220, 563-575 (1995)

64. Environment-induced decoherence II: Effect of decoherence on Bell's inequality for an EPR pair, A. Venugopalan, D. Kumar and R. Ghosh, Physica A 220,  576-584 (1995)

65. Nucleation in binary mixtures, Gangasharan and D. Kumar, Physica A224,  128-139, (1996)

66.  Phase diagrams and enthalpy calculation in a statistical model of binary mixtures, Gangasharan, D. Kumar and S.K. Sarkar, Phase Transitions 56, 217-37,  (1996)

67. Umklapp processes for electrons and their renormalisation group, D. Kumar and R. Rajaraman, Phys. Rev. B54, 4379-81 (1996)

68. Umklapp scattering in Fermi liquids: a renormalisation group approach, D. Kumar and R. Rajaraman, Int. J. Mod. Phys. B11, 1813-28 (1997)

69. Ferromagnetism of Anderson-localised electrons: application to cluster compounds, S. Lamba, A.K. Rastogi and D. Kumar, Phys. Rev. B56, 3251-64 (1997)

70. Quantum theory of double-slit interference: role of the quantum phase, D. Kumar, Phys. Letters A 246, 394-98 (1998)

71. Thermodynamics of a lattice model of aqueous mixtures, R. Sharma and D. Kumar, Phys. Rev. E58, 3405-15 (1998)

72. Measurement problem in quantum mechanics: characterestics of an apparatus, D. Kumar, Pramana-J. Phys. 51, 567-75 (1998)

73. Variable-range hopping: role of Coulomb interactions, S. Lamba and D. Kumar, Phys. Rev. B59, 4752-65 (1999)

74. Dielectric properties of an electron glass, S. Lamba and D. Kumar, Phys. Rev. B59, 4766-77 (1999)

75. Single-particle Schroedinger equation with gravitational self-interaction, Deepak Kumar and Vikram Soni Phys. Lett.A271, 157-166 (2000)

76. Kinetics of domain growth with local barriers, Kumela Tafa, Sanjay Puri and Deepak Kumar Phys.Rev. E63, 46115-25 (2001)

77. Localization in thin films: Cross-over from two dimensions to three dimensions, R.K. Brojen Singh and Deepak Kumar  Int. J. Mod. Phys. B15, 2627-2639 (2001)

78. Kinetics of phase separation in ternary mixtures, Kumela Tafa, Sanjay Puri and Deepak Kumar Phys.Rev. E64, 56139-49 (2001)

79. Autocorrelation function for domain growths with local barriers, K. Tafa, S.Puri and D.Kumar  Phase Transitions 75, 413 (2002)

80. Self-consistent theory of localization in thin films,  R.K. Brojen Singh and Deepak Kumar, Phys. Rev. B66, 075123-127 (2002)

 

81. Photon polarization states in anisotropic media Deepak Kumar Pramana 59, 329-336 (2002)

82. Effect of noise on quantum teleportation, Deepak Kumar and P. N. Pandey Phys. Rev. A68, 012317 (2003)

83. Correlated hopping in Coulomb glass Vikas Malik and Deepak Kumar J. Phys.: Condense. Matter 15, 5451-5460 (2003)

84. Electron delocalization in disordered films induced by magnetic field and film thickness  R. K. Brojen Singh and Deepak Kumar    Phys. Rev. B69, 115240(1-12) (2004)

85. Formation of the Coulomb gap in a Coulomb glass Vikas Malik and Deepak Kumar Phys. Rev. B 69, 153103(1-4) (2004)

86. Metal-insulator transition in tetrahedral semiconductors under lattice change,   Shailesh  Shukla, Deepak Kumar, Nitya Nath Shukla and Rajendra   Prasad     Int. J. Mod. Phys. B,18, 975-988 (2004)

87. Patterns in melting snow and vapor deposited layers  Ravi Mehrotra and Deepak Kumar Phys. Rev. Letters 92,  254502 (2004)

88. Aging and equilibrium fluctuations for domain growth in ternary mixtures. Sanjay Puri and Deepak Kumar Phys. Rev. Letters 93,  025701 (2004)

89. Autocorrelation functions for phase separation in ternary mixtures, Sanjay Puri and Deepak Kumar  Phys. Rev. E 70, 051501 (2004)

90. Thermal transport in low-dimensional lattices with nearest and next-nearest neighbour coupling G. Santosh, Deepak Kumar and R. Ramaswami,  J. Stat. Mechanics: Theory and Experiment P07005 (2005)

91. Dielectric critical behaviour at metal-insulator transition under lattice expansion Shailesh  Shukla, Deepak Kumar, Nitya Nath Shukla and  Rajendra  Prasad, J. Phys. Chem. Solids 66, 1150-1157 (2005)

92. Heat driven pattern formation in melting snow and vapor deposited atomic  monolayers, Ravi Mehrotra and Deepak Kumar  submitted        

 

Articles in Books

1. Spin glasses: experimental status, D. Kumar, Current trends in Magnetism, Ed. N.S. Satyamurthy and L. Madhav Rao, Indian Physics Association (1981)

2. Critical behaviour of dilute magnets near percolation threashold, D. Kumar, Physics of Disordered Solids, Ed. P. Shukla, Mittal Publications, Delhi (1983)

3. Relaxation in spin glasses near transition temperature, D. Kumar, Stochastic Processes: Formalism and Applications, Ed. G.S. Agarwal and S. Dattagupta Springer-Verlag  (Berlin,1983)

4. Relaxation of a superparamagnetic particle, D. Kumar, Stochastic Processes: Formalism and Applications, Ed. G.S. Agarwal and S. Dattagupta Springer-Verlag  (Berlin,1983)

5. Antiferromagnetic excitations on percolation clusters, D. Kumar, Recent Advances in Theoretical Physics, Ed. R. Ramachandran, World Scientific (Singapore,1985)

6. Low temperature relaxation in spin glasses, D. Kumar, Non-Debye Relaxation in Condensed Matter, Ed. M. Rajlakshmi and T.V. Ramakrishnan, World  Scientific (Singapore,1987)

7. Two-level systems in interaction with heat bath, D. Kumar, Advances in Statistical Physics of Solids and Liquids,     Ed. S. Prakash and K.N. Pathak, Wiley Eastern Ltd. (New Delhi,1989)

8. Fermi liquids on lattices, D. Kumar and R. Rajaraman, Electron Correlations in Atoms and Solids, Ed. A.N. Tripathi and I. Singh, Phoenix Publishing House,  (New Delhi ,1998)

9. Phase Transitions and Critical Phenomena: Renormalization Group Method in Field Theories for Condensed Matter,  Ed. Sumathi Rao, p. 119-188, Hindustan Book  Publishers   (Delhi,  2001)

10. Critical behaviour of dilute magnets near percolation threashold, D. Kumar

Reports

1. Proposal for a nonlinear reactor, D. Kumar Internal report No. IC/81/165, Int. Centre for Theoretica Physics, Trieste, Italy (1981)

Conference Proceedings Edited

1. Proceedings of the Discussion Meeting on Physics of Defects ed. Deepak Kumar Bulletin of Materials Science, 10, Nos.: 1 and 2, (1988), (Indian Academy of Sciences, Bangalore)           

2. Proceedings of the Conference on Quantum Many-Body Physics: From Cosmology to Superconductivity, ed by D.Kumar and S.Puri, Int. J. Mod. Phys.B 14, Nos,: 19 and 20, (2000)