Abstract
We use a novel technique to determine the phase breaking time τφ of electrons in ballistic quantum dots, from the aperiodic fluctuations observed in their low-temperature magnetoconductance. At temperatures below 100 mK, roughly similar values of τφ are obtained in both sizes of dot studied, suggesting a strong materials-related influence on τφ. Analysing the temperature-dependent characteristics of the fluctuations, τφ is found to scale roughly inversely with temperature close to 1 K, reminiscent of electron-electron scattering in two-dimensional disordered systems. At much lower temperatures, however, a saturation in τφ is observed, and is thought to result from a transition from two-to zero-dimensional transport, which occurs as the discrete level structure of the dot becomes resolved.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 730-734 |
| Number of pages | 5 |
| Journal | Surface Science |
| Volume | 361-362 |
| DOIs | |
| State | Published - Jul 20 1996 |
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Keywords
- Electrical transport
- Electrical transport measurements
- Heterojunctions
- Quantum effects
ASJC Scopus subject areas
- Physical and Theoretical Chemistry
- Condensed Matter Physics
- Surfaces and Interfaces
Cite this
Phase breaking in ballistic quantum dots : A correlation field analysis. / Bird, J. P.; Ishibashi, K.; Ferry, D. K.; Newbury, R.; Olatana, D. M.; Ochiai, Y.; Aoyagi, Y.; Sugano, T.
In: Surface Science, Vol. 361-362, 20.07.1996, p. 730-734.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Phase breaking in ballistic quantum dots
T2 - A correlation field analysis
AU - Bird, J. P.
AU - Ishibashi, K.
AU - Ferry, D. K.
AU - Newbury, R.
AU - Olatana, D. M.
AU - Ochiai, Y.
AU - Aoyagi, Y.
AU - Sugano, T.
PY - 1996/7/20
Y1 - 1996/7/20
N2 - We use a novel technique to determine the phase breaking time τφ of electrons in ballistic quantum dots, from the aperiodic fluctuations observed in their low-temperature magnetoconductance. At temperatures below 100 mK, roughly similar values of τφ are obtained in both sizes of dot studied, suggesting a strong materials-related influence on τφ. Analysing the temperature-dependent characteristics of the fluctuations, τφ is found to scale roughly inversely with temperature close to 1 K, reminiscent of electron-electron scattering in two-dimensional disordered systems. At much lower temperatures, however, a saturation in τφ is observed, and is thought to result from a transition from two-to zero-dimensional transport, which occurs as the discrete level structure of the dot becomes resolved.
AB - We use a novel technique to determine the phase breaking time τφ of electrons in ballistic quantum dots, from the aperiodic fluctuations observed in their low-temperature magnetoconductance. At temperatures below 100 mK, roughly similar values of τφ are obtained in both sizes of dot studied, suggesting a strong materials-related influence on τφ. Analysing the temperature-dependent characteristics of the fluctuations, τφ is found to scale roughly inversely with temperature close to 1 K, reminiscent of electron-electron scattering in two-dimensional disordered systems. At much lower temperatures, however, a saturation in τφ is observed, and is thought to result from a transition from two-to zero-dimensional transport, which occurs as the discrete level structure of the dot becomes resolved.
KW - Electrical transport
KW - Electrical transport measurements
KW - Heterojunctions
KW - Quantum effects
UR - http://www.scopus.com/inward/record.url?scp=0030192992&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0030192992&partnerID=8YFLogxK
U2 - 10.1016/0039-6028(96)00521-3
DO - 10.1016/0039-6028(96)00521-3
M3 - Article
AN - SCOPUS:0030192992
VL - 361-362
SP - 730
EP - 734
JO - Surface Science
JF - Surface Science
SN - 0039-6028
ER -