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Al Sievers

E.L. Nichols Professor of Physics, Emeritus

Al Sievers

Educational Background

B.S., 1958, Physics, University of California at Berkeley. Ph.D., 1962, University of California at Berkeley. Research Associate, Physics, Cornell University, 1962-64. Assistant Professor, Physics, Cornell, 1964 -67. Associate Professor, Physics, Cornell University, 1967-71. Professor, Physics, Cornell University, 1971-91. E. L. Nichols Professor of Physics, Cornell University, 1991-present. Director of the Laboratory of Atomic and Solid State Physics, Cornell University, 1995, 1997-2006. Member, Cornell Center for Materials Research; Member, Center for Radiophysics and Space Research, Cornell University. Visiting appointments at: Stanford University; University of California, Irvine; University of Canterbury, New Zealand; Los Alamos National Laboratory; IBM Research Laboratory, San Jose; Science University of Tokyo; Max Planck Institute, Stuttgart, Germany; Science University of Tokyo; Seoul National University; University of Canterbury, New Zealand; Tohoku University, Japan, Arizona State University, AZ. NSF Senior Fellow, 1971; New Zealand Erskine Fellow, 1976; Humboldt Senior Scientist, 1985. Fellow, American Physical Society; Fellow, Optical Society of America. APS Frank Isakson Prize, 1988; Institute of Physics (London) Kenneth John Button Prize, 1999. Podell Scholar, 2019.



Dynamical properties of intrinsic localized modes are studied in micromechanical arrays, in anharmonic crystals, in electrical transmission lines and in magnetic solids.


  • Physics

Graduate Fields

  • Physics


  • Laboratory of Atomic and Solid State Physics (LASSP)


The exploration of energy localization in discrete nonlinear lattices, both classical and quantum mechanical, is an ongoing focus.

Collaborators in this research: Nick Agladze, Vladimir Hizhnyakov, John Page, and Masayuki Sato.


Intrinsic Localized Modes in Anharmonic Crystals, Sievers AJ, Takeno S, Physical Review Letters 61, 970-973, (1988)

Optical Studies of Vibrational Properties of Disordered Solids, Barker AS, Sievers AJ, Reviews of Modern Physics 47, S1-S179, Suppl. 2 (1975)

Nonlinear Optical Properties of Periodic Laminar Structures, Bloembergen N, Sievers AJ, Applied Physics Letters 17, 483-486 (1970)

Colloquium: Nonlinear energy localization and its manipulation in micromechanical oscillator arrays, Sato, M; Hubbard, BE; Sievers, AJ, Reviews of Modern Physics 78, 137-157 (2006)

Stationary and Moving Intrinsic Localized Modes in One-Dimensional Monatomic Lattices with Cubic and Quartic Anharmonicity, Bickham, SR; Kiselev, SA; Sievers, AJ, Physical Review B 47, 14206-14211 (1993)

Observation of Coherent Transition Radiation, Happek U, Sievers AJ, Blum EB, Physical Review Letters 67, 2962-2965 (1991)

Far Infrared Antiferromagnetic Resonance In MnO and NiO, Sievers, AJ; Tinkham, M, Physical Review 129, 1566-1571 (1963)