Time-resolved energy transduction in a quantum capacitor

Woojin Jung, Doohee Cho, Min Kook Kim, Hyoung Joon Choi, In Whan Lyo

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)


The capability to deposit charge and energy quantum-by-quantum into a specific atomic site could lead to many previously unidentified applications. Here we report on the quantum capacitor formed by a strongly localized field possessing such capability. We investigated the charging dynamics of such a capacitor by using the unique scanning tunneling microscopy that combines nanosecond temporal and subangstrom spatial resolutions, and by using Si(001) as the electrode as well as the detector for excitations produced by the charging transitions. We show that sudden switching of a localized field induces a transiently empty quantum dot at the surface and that the dot acts as a tunable excitation source with subangstrom site selectivity. The timescale in the deexcitation of the dot suggests the formation of long-lived, excited states. Our study illustrates that a quantum capacitor has serious implications not only for the bottom-up nanotechnology but also for future switching devices.

Original languageEnglish
Pages (from-to)13973-13977
Number of pages5
JournalProceedings of the National Academy of Sciences of the United States of America
Issue number34
Publication statusPublished - 2011 Aug 23

All Science Journal Classification (ASJC) codes

  • General


Dive into the research topics of 'Time-resolved energy transduction in a quantum capacitor'. Together they form a unique fingerprint.

Cite this