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Ground state properties and metallic behaviour of strongly correlated two-dimensional electron systems in Si-based structures

Ziel

The aim of this 24-month project is to reveal the nature of the ground state and the unconventional ometallicoe behaviour recently discovered experimentally in the two-dimensional strongly interacting carrier systems. Experiments will be performed with high mobility 2D electron systems in Si-based structures, in which the metallic conduction effects are most pronounced. The studies will focus on the spin-and valley (pseudo-spin) properties of the low dimensional electron system. The spin arrangement in the metallic phase will be studied over the range of temperatures much less then the Fermi energy, where properties of the system are governed solely by quantum physics of the ground state. Theoretical studies will focus on effects of the electron-electron interaction and chiral spin- orbit spectrum in the presence of the broken spin-rotation symmetry and disorder.

The research activity will be performed along the following directions
- Quantitative studies of the Fermi-liquid interaction parameters from the renormalization of the effective mass and spin susceptibility;
-Studies of the thermodynamics (chemical potential) at zero and parallel magnetic field in order to reveal possible phase transitions related to spin and valley ordering.
u Studies of the microscopic parameters of the spin arrangement in the 2D system;
- Theoretical studies of the ground state and quantum transport in strongly correlated spin-chiral system;
- Studies of the critical behaviour in transport for a metallic phase in a 2D electron system with unitary symmetry;
- Theoretical studies of the level statistics in the system with strong spin-orbit coupling;
- Theoretical and experimental investigation of the spatial and temporal dispersion of the diffusion coefficient;
- Theoretical studies of the transport in the quantum percolation model with Coulomb interaction and chiral energy spectrum.

In total, the project will answer the major questions on the
- Fermi-liquid or non Fermi-liquid nature of the ground state, and the relevant interaction parameters;
- spin and valley (e.g. pseudo-spin) structure of the ground state and the existence of ordering phase transitions;
- essence of the observed metallic behaviour as an intrinsic feature of the ground state or as a material dependent crossover phenomenon.

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Koordinator

Johannes Kepler University of Linz
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Adresse
Altenbergerstrasse 69
4040 Linz
Österreich

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Beteiligte (7)

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Letzte Aktualisierung: 30 Oktober 2002

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Permalink: https://cordis.europa.eu/project/id/INTAS-1999-01070/de

European Union, 2024