期刊
NANO LETTERS
卷 10, 期 5, 页码 1657-1663出版社
AMER CHEMICAL SOC
DOI: 10.1021/nl904233u
关键词
Molecular electronics; current-induced force; electron-vibration coupling; Berry's phase; quantum interference
类别
资金
- Danish FNU
- EU [213609]
We examine a molecular bridge connecting two metallic electrodes. We find that an electronic current passing across the bridge can cause a vibrational instability of the molecule, which ultimately can lead to a breakdown of the bridge. This instability is generated by a hitherto never considered mechanism, which surprisingly involves the quantum mechanical phase of the electronic waves, the Berry phase. This mechanism works for highly conducting bridges, and contrary to breakdown by traditional joule heating, this instability is deterministic and occurs at certain critical voltages. We demonstrate the new mechanism using state-of-the-art ab initio calculations on realistic molecular bridges.
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