Bulletin of the American Physical Society
2005 APS March Meeting
Monday–Friday, March 21–25, 2005; Los Angeles, CA
Session N3: Electronic and Spin Effects in Low-Dimensional and Nanoscale Systems |
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Sponsoring Units: DCMP Chair: Mei-Yin Chou, Georgia Institute of Technology Room: LACC 515B |
Wednesday, March 23, 2005 8:00AM - 8:36AM |
N3.00001: Controlling the Spin State of Individual Cobalt Adatoms and Molecules Invited Speaker: The spin of individual magnetic atoms and molecules at surfaces is of fundamental interest and may play an important role in future atomic-scale technologies, among them classical and quantum computation. In this talk we demonstrate the ability to manipulate the spin state and associated magnetic properties of individual cobalt adatoms by the controlled attachment of molecular ligands. The spin state of the cobalt adatoms and complexes is determined via the Kondo resonance by low-temperature scanning tunneling spectroscopy. Spatial Kondo resonance mapping is also introduced as novel imaging tool to localize spin centers in magnetic molecules with atomic precision. [Preview Abstract] |
Wednesday, March 23, 2005 8:36AM - 9:12AM |
N3.00002: Quantum Confinement by Schottky Barriers and its Consequences Invited Speaker: Atomically uniform Pb and Ag films have been successfully grown on Si(111) and Ge(111), respectively, despite a large lattice mismatch in each case. The resulting Schottky barrier at the interface confines the electrons in the film to form quantum well states or subbands. The electronic structure of the film including the ground state wave function can be significantly different from the bulk case, leading to substantial variations in physical properties as a function of film thickness. These variations generally follow a damped oscillatory curve riding on an approximately $1 \mathord{\left/ {\vphantom {1 {N^x}}} \right. \kern-\nulldelimiterspace} {N^x}$ baseline function, with the exponent $x$ often close to unity. The oscillatory behavior is similar to the shell effect associated with the periodic property variations of elements in the period table. This talk discusses the basic electronic structure of thin metal films as measured by angle-resolved photoemission and the connections to physical properties including the surface energy, thermal stability, density of states, electron-phonon coupling, etc. Quantum size effects can also affect morphological evolution during film growth and heat treatment. The Schottky barrier can be modified by the use of interfactants, and experimental results will be presented to illustrate the utility of this method for quantum control and engineering. In collaboration with M. Upton, D. Ricci, P. Czoschke, L. Basile, S. J. Tang, Hawoong Hong, J. J. Paggel, D.-A. Luh, and T. Miller. [Preview Abstract] |
Wednesday, March 23, 2005 9:12AM - 9:48AM |
N3.00003: Quantum Well States Induced Oscillatory Superconductivity in Pb Thin Films Invited Speaker: |
Wednesday, March 23, 2005 9:48AM - 10:24AM |
N3.00004: Extracting surface phonon properties from the electronic spectral function Invited Speaker: Angle resolved photoemission measurements have revealed an enhancement in the electron-phonon coupling (EPC) for two- dimensional surface states and quantum-well states in thin films. A recent theoretical advancement by J. Shi [1] has developed a method for the direct extraction of the momentum dependent Eliashberg function from the high-resolution photoemission data. The origin of the enhanced EPC at surfaces and interfaces will be explored as well as schemes to tune the EPC by modification of the surface electronic and vibrational properties. The implications of EPC on physical properties will be discussed, including the lifetime of electronic states near the Fermi energy. \\ \\1. Junren Shi et al., Phys. Rev. Lett. 92, 186401 (2004). \\ \\The work at UT supported by NSF- DMR 0105232. Oak Ridge National Laboratory, managed by UT-Battelle, LLC, for the U.S. Dept. of Energy under contract DE-AC05-00OR22725. [Preview Abstract] |
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