The transport properties of electronic devices are usually characterized on the basis of conductance measurements. Such measurements are adequate for devices in which transport occurs incoherently, but for very small devices—such as quantum dots1,2—the wave nature of the electrons plays an important role3. Because the phase of an electron's wavefunction changes as it passes through such a device, phase measurements are required to characterize the transport properties fully. Here we report the results of a double-slit interference experiment which permits the measurement of the phase-shift of an electron traversing a quantum dot. This is accomplished by inserting the quantum dot into one arm of an interferometer, thereby introducing a measurable phase shift between the arms. We find that the phase evolution within a resonance of the quantum dot can be accounted for qualitatively by a model that ignores the interactions between the electrons within the dot. Although these electrons must interact strongly, such interactions apparently have no observable effect on the phase. On the other hand, we also find that the phase behaviour is identical for all resonances, and that there is a sharp jump of the phase between successive resonance peaks. Adequate explanation of these features may require a model that includes interactions between electrons.
This is a preview of subscription content, access via your institution
Open Access articles citing this article.
Nature Communications Open Access 12 August 2022
Nature Communications Open Access 22 July 2020
Nature Communications Open Access 25 June 2020
Subscribe to this journal
Receive 51 print issues and online access
$199.00 per year
only $3.90 per issue
Rent or buy this article
Prices vary by article type
Prices may be subject to local taxes which are calculated during checkout
Van Houten, H., Beenakker, C. W. J. & Staring, A. A. W. in Single Charge Tunnelling–Coulomb Blockade Phenomena in Nanostructures (eds Grabert, H. & Devoret, M. H.), (Plenum, New York, 1992).
Meirav, U. & Foxman, E. B. Semicond. Sci. Technol. 10, 255–284 (1995).
Yacoby, A., Heiblum, M., Mahalu, D. & Shtrikman, H. Phys. Rev. Lett. 74, 4047–4050 (1995).
Aronov, A. G. & Sharvin, Yu. V. Rev. Mod. Phys. 59, 755–779 (1987).
Büttiker, M. Phys. Rev. Lett. 57, 1761–1764 (1986).
Gefen, Y., Imry, Y. & Azbel, M. Ya. Phys. Rev. Lett. 52, 129–132 (1984).
Yacoby, A., Schuster, R. & Heiblum, M. Phys. Rev. B53, 9583–9586 (1996).
Levy Yeyati, A. & Büttiker, M. Phys. Rev. B52, 14360–14363 (1995).
Hackenbroich, G. & Weidenmüller, H. A. Phys. Rev. Lett. 76, 110–113 (1996).
Bruder, C., Fazio, R. & Schoeller, H. Phys. Rev. Lett. 76, 114–117 (1996).
Yacoby, A., Heiblum, M., Umansky, V., Shtrikman, H. & Mahalu, D. Phys. Rev. Lett. 73, 3149–3152 (1994).
Breit, G. & Wigner, E. Phys. Rev. 49, 519–531 (1936).
Buks, E. Phys. Rev. Lett. 77, 4664–4667 (1996).
About this article
Cite this article
Schuster, R., Buks, E., Heiblum, M. et al. Phase measurement in a quantum dot via a double-slit interference experiment. Nature 385, 417–420 (1997). https://doi.org/10.1038/385417a0
This article is cited by
Nature Physics (2023)
Nature Communications (2022)
Nature Nanotechnology (2021)
Nature Communications (2020)
Nature Communications (2020)