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Ground state structure and conductivity of quantum wires of infinite length and finite width.
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Abstract
We have studied the ground state structure of quantum strips within the local spin-density approximation, for
a range of electronic densities between 5 104 and 2 106cm−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 close to 0.7 2e2 /h, decreasing
with increasing electron density in agreement with experiments. At higher densities the system becomes
paramagnetic and G takes a value near 2e2 /h, showing a similar decreasing behavior with increasing electron
density. In both cases, the physical parameter that determines the value of the conductance is the ratio K/K0 of
the compressibility of the system to the free one.
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MALET I GIRALT, Francesc, et al. Ground state structure and conductivity of quantum wires of infinite length and finite width. Physical Review B. 2005. Vol. 72, num. 20, pags. 205326-1-205326-10. ISSN 0163-1829. [consulted: 11 of June of 2026]. Available at: https://hdl.handle.net/2445/10576