Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2005-11-15
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
Accepted for publication in Physical Review B
Scientific paper
10.1103/PhysRevB.72.205326
We have studied the ground state structure of quantum strips within the local spin-density approximation, for a range of electronic densities between $\sim$ 5$\times10^4$ and 2$\times10^6$ cm$^{-1}$ and several strengths of the lateral confining potential. The results have been used to address the conductance $G$ of quantum strips. At low density, when only one subband is occupied, the system is fully polarized and $G$ takes a value which is close to 0.7(2e$^2/h$), decreasing with increasing electron density in agreement with experiments. At higher densities the system becomes paramagnetic and $G$ takes a value near (2e$^2/h$), showing a similar decreasing behaviour with increasing electron density. In both cases, the physical parameter that determines the value of the conductance is the ratio $K/K_0$ of the compressibility of the system over the free one.
Barranco Manuel
Lipparini Enrico
Malet Francesc
Pi Marti
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