TY - JOUR
T1 - Charge rearrangement and screening in a quantum point contact
AU - Lüscher, S.
AU - Moore, L. S.
AU - Rejec, T.
AU - Meir, Yigal
AU - Shtrikman, Hadas
AU - Goldhaber-Gordon, D.
PY - 2007/5/11
Y1 - 2007/5/11
N2 - Compressibility measurements are performed on a quantum point contact (QPC). Screening due to mobile charges in the QPC is measured quantitatively, using a second point contact. These measurements are performed from pinch-off through the opening of the first few modes in the QPC. While the measured signal closely matches a Thomas-Fermi-Poisson prediction, deviations from the classical behavior are apparent near the openings of the different modes. Density functional calculations attribute the deviations to a combination of a diverging density of states at the opening of each one-dimensional mode and exchange interaction, which is strongest for the first mode.
AB - Compressibility measurements are performed on a quantum point contact (QPC). Screening due to mobile charges in the QPC is measured quantitatively, using a second point contact. These measurements are performed from pinch-off through the opening of the first few modes in the QPC. While the measured signal closely matches a Thomas-Fermi-Poisson prediction, deviations from the classical behavior are apparent near the openings of the different modes. Density functional calculations attribute the deviations to a combination of a diverging density of states at the opening of each one-dimensional mode and exchange interaction, which is strongest for the first mode.
UR - http://www.scopus.com/inward/record.url?scp=34547305786&partnerID=8YFLogxK
U2 - 10.1103/PhysRevLett.98.196805
DO - 10.1103/PhysRevLett.98.196805
M3 - Article
C2 - 17677648
AN - SCOPUS:34547305786
SN - 0031-9007
VL - 98
JO - Physical Review Letters
JF - Physical Review Letters
IS - 19
M1 - 196805
ER -