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Full-Text Articles in Physics

Improved Treatment Of Loop Diagrams In Su(3) Baryon Chiral Perturbation Theory, Jf Donoghue, Br Holstein Sep 1998

Improved Treatment Of Loop Diagrams In Su(3) Baryon Chiral Perturbation Theory, Jf Donoghue, Br Holstein

Barry R Holstein

Baryon chiral perturbation theory as conventionally applied has a well-known problem with the SU(3) chiral expansion in that loop diagrams generate very large SU(3) breaking corrections and greatly upset the subsequent phenomenology. We argue that the problem comes from the portions of loop integrals corresponding to propagation at such short distances that the effective theory is not valid. One can reformulate the theory equally rigorously by regulating the loop integrals using a momentum-space cutoff which removes the spurious short-distance physics. We show that this reformulation improves the phenomenology for reasonable values of the cutoff.


Intersubband Scattering Of Cold Electrons In A Coupled Quantum Well With Subband Spacing Below !!Lo., James Heyman, J Barnhorst, Karl Unterrainer, J Williams, M.S. Sherwin, K. Campman, A.C. Gossard Jul 1998

Intersubband Scattering Of Cold Electrons In A Coupled Quantum Well With Subband Spacing Below !!Lo., James Heyman, J Barnhorst, Karl Unterrainer, J Williams, M.S. Sherwin, K. Campman, A.C. Gossard

James Heyman

No abstract provided.


The Harmonic Oscillator Propagator, Br Holstein Dec 1997

The Harmonic Oscillator Propagator, Br Holstein

Barry R Holstein

The Feynman propagator for the harmonic oscillator is evaluated by a variety of path-integral-based means.


Answer To Question #76. Neutrino Mass And Helicity, Br Holstein Dec 1997

Answer To Question #76. Neutrino Mass And Helicity, Br Holstein

Barry R Holstein

No abstract provided.


Photolithographic Patterning Of Vacuum-Deposited Organic Light Emitting Devices, Peifang Tian, P. Burrows, B. Bulovic, S. Forrest Dec 1997

Photolithographic Patterning Of Vacuum-Deposited Organic Light Emitting Devices, Peifang Tian, P. Burrows, B. Bulovic, S. Forrest

Peifang Tian

No abstract provided.


Characteriation Of Bulk, Polycrystalline Indium Nitride Grown Of Subatmospheric Pressures, Jeffrey Dyck, Kathleen Kash, Kwieseon Kim, Walter Lambrecht, Cliff Hayman, Alberto Argoitia, Michael Grossner, Willie Zhou, John Angus Dec 1997

Characteriation Of Bulk, Polycrystalline Indium Nitride Grown Of Subatmospheric Pressures, Jeffrey Dyck, Kathleen Kash, Kwieseon Kim, Walter Lambrecht, Cliff Hayman, Alberto Argoitia, Michael Grossner, Willie Zhou, John Angus

Jeffrey Dyck

Polycrystalline, wurtzitic indium nitride was synthesized by saturating indium metal with atomic nitrogen from a microwave plasma source. Plasma synthesis avoids the high equilibrium pressures required when molecular nitrogen is used as the nitrogen source. Two types of growth were observed: 1) small amounts of indium nitride crystallized from the melt during cooling and 2) hexagonal platelets formed adjacent to the In metal source on the crucible sides. The mechanism of this latter growth is not established, but may involve transport of indium as a liquid film. The crystals were characterized by electron diffraction, X-ray diffraction, elemental analysis, scanning electron ...