Some kind of homepage of

Hi there!

You have just sneaked into Johan's place, an almost deserted place on the net. However, since you ended up here, you might be interested in who I am and I might as well take the opportunity to tell you something about myself. I am doctor in physics and I am presently working as postdoc at the Fritz-Haber-Institut der Max-Planck-Gesellschaft in Berlin, Germany. My present project concerns dehydrogenation of hydrocarbons.

Dr. Bo Hellsing is leading the theoretical subgroup at Solid State Physics called *The Interface Modeling Group* (IMG).
IMG studies the geometry and electron structure at
complex interfaces like grain boundaries and thin adlayers on
surfaces. I have been working on two different projects during my PhD-studies.

My main project is interfaces and surfaces in metal oxides and in particular grain boundary phenomena in poly crystalline Zinc oxide varistors. This investigation is based on first principles calculations of the electron structure in pure and doped grain boundaries in ZnO. I am in addition doing macroscopic simulations of the current flow through a poly crystalline varistor. This work is performed in close collaboration with Dr. Paul Bristowe and Helder S. Domingos in the Atomistic Simulation Group at the Department of Materials Science and Metallurgy at the University of Cambridge, UK.

H. S. Domingos, J. M. Carlsson, P. D. Bristowe and B. Hellsing,

*Charge accumulation and Barrier formation at grain boundaries in ZnO decorated with bismuth*, J. Phys.: Cond. Matt.**14**12717 (2002).J. M. Carlsson, B, Hellsing, H. S. Domingos and P. D. Bristowe,

*Theoretical investigation of the pure and Zn-doped alpha- and delta-phases of Bi2O3*, Phys. Rev. B**65**205122 (2002).J. M. Carlsson, H. S. Domingos, B, Hellsing and P. D. Bristowe,

*Electronic Structure of a Bi-doped Sigma=13 tilt grain boundary in ZnO*, Interface Sci.**9**, 143 (2001).H. S. Domingos, P. D. Bristowe, J. M. Carlsson and B. Hellsing,

*Segregation effects at a High-Angle Twist Boundary in ZnO*, Interface Sci.**9**, 231 (2001).Johan M. Carlsson, Bo Hellsing, Helder S. Domingos and Paul D. Bristowe,

*Electronic properties of a grain boundary in Sb-doped ZnO,*J. Phys. Condens. Matter.**13**, 9937-9943 (2001).Johan M. Carlsson,

*Electronic structure of the polar ZnO{0001}-surfaces,*Comp. Mat. Sci.**22**, 24-31 (2001).Johan M. Carlsson,

*Simulation of the I-V characteristics of a poly crystalline Varistor*, Gothenburg Institute Physics Report**364**, (2002).Johan M. Carlsson,

*Theoretical investigation of the structural and electronic propreties of ZnO*, Master of Science thesis, Chalmers university of technology, Gothenburg, Sweden (1996).

I have also been working with a theoretical investigation of the Metallic quantum well system Na/Cu(111). The study determined the adsorption geometry, vibration modes and electron structure of submono- and monolayer coverage of Na on the Cu(111) surface. The calculations are based on first principles DFT-calculations using the GGA exchange-correlation functional together with a plane wave basis set and ultrasoft pseudopotentials. This study was performed in close collaboration with the experimental activity in the group.

Johan M. Carlsson and Bo Hellsing,

*First principles investigations of the quantum well system, Na on Cu(111)*, Phys. Rev. B**61**13973 (2000).B. Hellsing, J. Carlsson, L. Wallden and S-Å Lindgren,

*Phonon-induced decay of a quantum well hole: 1 ML of Na on Cu(111)*, Phys. Rev B**61**2343 (2000).Johan Carlsson,

*First principles investigations of the quantum well system, Na on Cu(111)*, Licentiate thesis, Göteborg University, Gothenburg, Sweden (1999).

The title of my thesis is:

Johan M. Carlsson, *A First-Principles Study of Interface
Systems: Electronic properties of Metal Quantum Wells and Varistor
materials*, PhD-thesis, Göteborg University, Gothenburg,
Sweden (2002).

My present address is:

Abteilung Theorie

Fritz-Haber-Institut der Max-Planck-Gesellschaft

Faradayweg 4-6

D-14195 Berlin

Germany

This page is certainly not under construction. It is continuously
developing, although the steps are discrete. By the way, the last
step in any direction was taken 2002-12-05. In one sense, this page
is the answer to the modern version of the Cartesian proof of
existence: *"If you have a homepage, you do exist - at
least in cyberspace" (Johannes Carolus, The yet unpublished,
1998-12-16)*

As you probably already have understood, this is a personal homepage of Johan Carlsson why any coincidence of opinions to Chalmers or Göteborg university is purely accidental.