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Israel Physical Society 1990 Annual Meeting Program % It The Hebrew University of Jerusalem Racah Institute of Physics ; \| s- OOC'J /. Israel Physical Society 1990 Annual Meeting Program % Bulletin of the Israel Physical Society Vol. 36, 1990 I The Hebrew University of Jerusalem Racah Institute of Physics INiS OOCUM TRN Israel Physical Society 1990 Annual Meeting Bulletin of the Israel Physical Society Vol. 36, 1990 Israel Physical Society-Annual Conference The Hebrew University, Jerusalem, May 6,7-1990 Scientific Programme Sunday, May 6 08:30 - 09:30 Registration (Wise Auditorium Lobby). 09:30 -10:00 Opening session (Wise Auditorium). 10:00-11:00 Plenary Lecture: "Geometry in Modern Theoretical Physics", Orlando Alvarez, University of California, Berkeley. 11:00 -11:30 Coffee break 11:30-12:30 Plenary Lecture: "Novel Magnetic Phenomena and High Tc Superconductivity", Robert.J. Birgenau, MIT. 12:30 -13:30 Lunch break 13:45-14:20 IPS Meeting-election of the new president of IPS {Wise Auditorium). 14:30 -18:30 Section Meetings (two sessions with coffee break between 16:00-16:30): Statistical Physics: Chairmen: A. Aharony (Tel-Aviv Univ.) and S. Fishman (Technion). Invited lecturers: A.B. Harris (Univ. of Pennsylvania), D. Kandel (Weizmann Inst.), Y. Stavans (Weizmann Inst), I. Kanter (Bar-Han Univ.) and D. Hansel (Hebrew Univ.). (Canada Auditorium) Astrophysics and Cosmology: Chairman: T. Piran (Hebrew Univ.). Invited Lecturers: D. Lynden-Bell (Cambridge Institute of Astronomy), D. Portnoy and S. Pistiner (Technion) and A. Wandel. (Weizmann Inst.). (Sprinzak Bldg. 115) Particles and Fields: Chairman: Y. Frishman (Weizmann Inst.). Invited Lecturers: S. Elitzur (Hebrew Univ.), M. Karliner (Tel-Aviv Univ.), and S. Solomon (Hebrew Univ.). (Kaplun Bldg.) Sub-Micron and Low Dimensionality Physics: Chairmen: I. Freund (Bar-Han Univ.) and Z. Ovadyahu (Hebrew Univ.). Invited Lecturers: M.A. Kastner (MIT), Y. Avishai (Ben-Gurion Univ.), M. Azbel (Tel-Aviv Univ.), M.' Kaveh (Bar-Man Univ.). (Kaplan B Hall) Nuclear Physics: Chairmen: J. Burde and I. Unna (Hebrew Univ.). Invited Lecturers: J. Alster (Tel-Aviv Univ.), C. Broude (Weizmann Inst.), A. Wolf (Negev Research Center), S. Mordechai (Ben-Gurion Univ.) and O. Meirav (TRIUMF). {Sprinzak 117) Lasers, Plasma Physics, Optics and Spectroscopy: Chairmen: B.S. Fraenkel and L. Friedland (Hebrew Univ.) Invited Lecturers: B. Shore (Lawrence Livermore National Laboratory), S. Yatsiv, B. Meerson (Hebrew Univ.), A. Fruchtman (Weizmann Inst.) and Z. Rosenwaks (Ben-Gurion Univ.). {Levin 8) Monday, May 7 09:00 -12:30 Section Meetings and Workshops (two sessions and coffee break between 10:30 -11:00): Computational Physics: Chairperson: J. Adler (Technion). Invited Lecturers: D. Rapaport (Bar-Han Univ.), S. Solomon (Hebrew Univ.), S. Eckstein and G. Shaviv (Technion). (Levy Bldg.) High Tc Superconductors: Chairmen: I. Felner (Hebrew Univ.) and M. Weger (Hebrew Univ.). Invited Lecturers: B. Horowitz (Ben-Gurion Univ.), Y. Yeshurun (Bar-Han Univ.) and O. Shaffief (Hebrew Univ.). (Canada Auditorium) Medical Physics: Chairpersons: S. Akselrod (Tel-Aviv Univ.) and A. Weinreb (Hebrew Univ.) Invited Lecturers: R. Tirosh, B. Ehrenberg (Bar-llan Univ.) and D. Kwiat (Tel- Aviv Univ.). (Sprinzak 114) Condensed Matter: Chairman: D. Davidov (Hebrew Univ.). Invited lecturer: E. Ehrenfreund (Technion). (Kaplan B Hall) Opto-Electronic Devices and Thin Films (with the Israel Vauum Society): Chairman: A. Zemel (Soreq Nuclear Center) Invited Lecturers: R. Weil (Technion), J. Sagiv (Weizmann Inst.), Y. Lifshitz and and D. Eger (Soreq Nuclear Center). {Kaplan B Hail and Wise Auditorium) Quantum Optics (workshop): Organizers: Z. Rosenwaks (Ben Gurion Univ.) and Y. Oreg (Negev Nuclear Center). Invited Lecturer: K. Bergmann, Univ. of Kaiserslautern, Germany. Research groups from the Negev Research Center, Ben- Gurion, Tel-Aviv and Hebrew Universities, and the Weizmann Institute will participate. (Sprinzak 115) Chaos (workshop): Organizer: U. Smilansky (Weizmann Inst.). Invited Lecturers: D. Cohen (Technion) and E. Braun (Weizmann Inst.). {Sprinzak 216) 12:45 -14:30 Conference Lunch 15:00 -18:00 Visit to the Old City. Foreword Once again it is the turn of the Racah Institute of Physics to host the Annual Conference of the Israel Physical Society. We would like to extend a warm welcome to all participants and wish them a fruitful meeting and a pleasant stay in Jerusalem. A warm welcome is extended also to members of the Israeli Vacuum Society who hold their Annual Meeting jointly with ours. The Conference reflects the extent and diversity of physics research in Israel, ranging from the macro to the micro. The morning session of the first day is devoted to plenary lectures of general interest, while the sessions on Sunday afternoon and Monday morning consist each of four parallel sections of a more specific nature, covering most of the areas of physics research in the country. Among these sections there are two workshops, defined as such, but the difference between them and some of the ordinary sections is largely semantic. We have attempted to keep the overlap between sections to a minimum so as to enable each participant to choose the lectures of his interest without too much difficulty. The contributed papers will be presented orally except in two of the sections, where the large number of contributions made if necessary to present some of the papers by posters. A visit has been organized for Monday afternoon to the newly excavated underground tunnels in the Old City. Unfortunately, only a limited number of participants would be able to join this tour but we hope that everybody would take advantage of the free afternoon to enjoy the unique city of Jerusalem. Finally, I would like to thank the members of the local committee, the chairmen of the various sections, the secretariat of the Racah Institute and many others who have devoted much time and effort for the organization of the Conference. Special thanks are due to the secretary of the committee, Prof. M. Finkenthal, for his untiring and willing efforts to make this conference successful. A. Many Chairman of the Organizing Committee The Israel Physical Society Council Y. Yacoby (Hebrew University, President I. Tserruya (Weizmann Institute), Vice President V. Halpern (Bar-Han University), Treasurer I. Balberg (Hebrew University), Secretary D. Eger (Soreq Nuclear Research Center) S. Akselrod (Tel-Aviv University) S. Goshen (Negev Nuclear Research Center) R. Weil (Technion) A. Zinn (Rafael) I. Avishai (Ben-Gurion University) Corporate Members Bar-Han University Ben-Gurion University Hebrew University Israel Atomic Energy Authority Technion - Israel Institute of Technology Tel-Aviv University Weizmann Institute of Science Organizing Committee - The Hebrew University of Jerusalem A. Many, Chairman A. Marinov E. Rabinovici I. Unna M. Finkenthal, Secretary Abstracts Plenary Lectures Geometry in Modern Theoretical Physics 0. Alvarez University of California at Berkeley ABSTRACT Geometry has influenced our view in modern theoretical physics. The geometrical approach has been used to try to understand difficult questions in quantum field theory. Fortunately, many familiar problems in elementary quantum mechanics are examples of the geometrical ideas. By using simple quantum mechanical models we will develop he geometrical concepts and subsequently see what they tell us about more complicated situations in quantum field theory. NOVEL MAGNETIC PHENOMENA AND HIGH TEMPERATURE SUPERCONDUCTIVITY Robert J. Birgeneau, Department of Physics, Massachusetts Institute of Technology, Cambridge, MA 02139 The discovery of high-temperature superconductivity in lamellar copper oxide materials is one of the most dramatic and unexpected events in physics in recent history. In this talk we will present our views on the basic physics of this new phenomenon and we will explain why the problem is proving to be so difficult in spite of the unprecedented assault on it by many thousands of physicists, chemists, and material scientists. It appears that the superconductivity in the CuO2 superconductors differs in an essential fashion microscopically from that in conventional electron - phonon driven systems. Both the S - 1/2 character of the Cu*+ ion and the quasi -two - dimensionality (2D) of the materials appear to be essential ingredients. All materials have in common the juxtaposition of an antiferromagnetic insulating state, a 2D weakly localized spin glass, and a superconducting phase which derives from a fluctuating short - range ordered, incommensurate 2D spin fluid. Many exotic theories have been proposed to explain the superconductivity but so far there are no definitive tests to choose a unique model. This work has been carried out in collaboration with a large number of colleagues including Amnon Aharony, Yasuo Endoh, Marc Kastner, and Gen Shirane. This research is supported by the U.S. National Science Foundation under contract Nos. DMR8S - 10856 and DMR87 - 19217. 1. Statistical Physics Invited Lectures A STRONGLY FRUSTRATED THREE DIMENSIONAL QUANTUM ANTIFERROMAGNET A. B. Harris University of Pennsylvania The magnetic Fe ions (S=5/2) in the insulator FeF3 form a lattice of corner sharing tetrahedra in which the dominant interactions between the nearest neighbors in each tetrahedron are antiferromagnetic. Magnetically, this structure is highly frustrated and therefore provides a three-dimensional analog of the highly interesting triangular antiferromagnet. For spins 1/2 on such a tetrahedral structure the ground state is well described as a
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