Dmitry A. Garanin | |
---|---|
Born | |
Citizenship | United States |
Alma mater | MIPT (B.S., M.S.) Moscow State University (Ph.D.) |
Known for | Condensed matter physics |
Awards |
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Scientific career | |
Fields | Physics |
Institutions | City University of New York |
Thesis | "Normal modes and relaxation processes in magnetically ordered materials with single-site anisotropy" (1985) |
Dmitry Garanin is a Russian-American physicist known for his work in theoretical condensed matter physics. He is a professor in the Department of Physics & Astronomy at Lehman College [1] of The City University of New York and a faculty member in the physics department of the Graduate Center, CUNY. [2]
Garanin attended the Moscow Institute of Physics and Technology from 1972 to 1978, graduating with a B.S. and M.S. in physics. He obtained his Ph.D. in physics from Moscow State University in 1985. Garanin worked in the I. E. Tamm Division of Theoretical Physics of the Lebedev Physical Institute in Moscow, then at the Moscow Technological University (MIREA). In 1992 he emigrated to Germany with his family, where he worked at the University of Hamburg, the Max Planck Institute for the Physics of Complex Systems in Dresden, and at the University of Mainz. In 2005, he became an associate professor at the Department of Physics & Astronomy, Lehman College and a member of the doctoral faculty of the CUNY Graduate Center. He was promoted to full professor in 2013. Garanin has authored or coauthored over 150 research papers in the field of Solid-State Physics / Magnetism. [3]
In 2013, Garanin became a Fellow of the American Physical Society. [4]
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Periodic instantons are finite energy solutions of Euclidean-time field equations which communicate between two turning points in the barrier of a potential and are therefore also known as bounces. Vacuum instantons, normally simply called instantons, are the corresponding zero energy configurations in the limit of infinite Euclidean time. For completeness we add that ``sphalerons´´ are the field configurations at the very top of a potential barrier. Vacuum instantons carry a winding number, the other configurations do not. Periodic instantons werde discovered with the explicit solution of Euclidean-time field equations for double-well potentials and the cosine potential with non-vanishing energy and are explicitly expressible in terms of Jacobian elliptic functions. Periodic instantons describe the oscillations between two endpoints of a potential barrier between two potential wells. The frequency of these oscillations or the tunneling between the two wells is related to the bifurcation or level splitting of the energies of states or wave functions related to the wells on either side of the barrier, i.e. . One can also interpret this energy change as the energy contribution to the well energy on either side originating from the integral describing the overlap of the wave functions on either side in the domain of the barrier.
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