RESEARCH SUMMARY

Adam Kaminski

3/2006

Past Contributions

1990  Designed and constructed a gas purification line and mass spectrometer for dating minerals using the K-Ar method.

1998  First operation of the SES200 electron analyzer in angular mode, which resulted in the discovery of nodal quasiparticles in the superconducting state of a d-wave HTSC superconductor - work published in Physical Review Letters (2000).

1997-98  Managing the construction of the undulator 4mNIM beamline at Synchrotron Radiation Center (PI – Juan Carlos Campuzano, approx. cost $1,000,000).

1999  Precise mapping of the Fermi surface of a HTSC superconductor - work published in Physical Review Letters (2001).

1999-00  Designed and constructed an ARPES system utilizing an SES50 analyzer with energy resolution of 5 meV, angular resolution of 0.03 deg, angle precision of 0.1 deg and sample positioning accuracy of 2.5 um. (PI Juan Carlos Campuzano, approx. cost $220,000).

2000  Showed for the first time that the scattering rate and band dispersion are related via a Kramers-Kronig relation in HTSC, thus the casuality principle applies to ARPES data - work published in Physical Review Letters (2001).

2001  First evidence for time reversal symmetry breaking in the pseudogap state of a high temperature superconductor using ARPES with circularly polarized photons - work published in journal Nature (2002).

• New crossover line found in the phase diagram of the cuprates separating a coherent metallic-like state at high doping and low temperature and an incoherent, strange metal state at lower doping and high temperature- work published in Physical Review Letters (2003).

• First direct observation of two-band superconductivity in MgB2 using Angle Resolved Photoemission Spectroscopy - work published in journal Nature (2003).

Present/recent contributions

• Evidence that the background photoemission signal of the cuprates has an extrinsic origin – published in Physical Review B (2004).

2004  Observation of spectroscopic signatures of the metal-nonmetal crossover in Sr2RuO4, correlating momentum resolved information with anisotropic transport properties. Published in Physical Review Letters (2004).

2005  Observation of an unusual doping dependence of the scattering rate anisotropy in Bi2Sr2CaCu2O8. This finding may imply that the observed anisotropy is due to some as yet unidentified process and not simply impurity scattering. Published in Physical Review B (2005).

2005  Observation of transition from 2D to 3D electronic structure in single layer high temperature superconductor Bi2201

2005  Developed new technique – AutoCorrelated ARPES (AC ARPES) to study elastic scattering processed in high temperature superconductors

2005  Observation of change of the Fermi surface topology with doping in double layer  high temperature superconductor Bi2212