Singlet–triplet transition induced by Zeeman energy in weakly coupled vertical double quantum dots
✍ Scribed by Tetsuo Kodera; Keiji Ono; Shinichi Amaha; Yasuhiro Tokura; Yasuhiko Arakawa; Seigo Tarucha
- Publisher
- Elsevier Science
- Year
- 2008
- Tongue
- English
- Weight
- 217 KB
- Volume
- 40
- Category
- Article
- ISSN
- 1386-9477
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✦ Synopsis
We use Pauli-spin blockade (P-SB) in a vertical double quantum dot to study the interplay between the nuclear spin effect and exchange interaction. We observe a specific P-SB lifting, reflecting coexistence of singlet-triplet admixing due to fluctuating nuclear spin field and singlet-triplet transition induced by the Zeeman effect when the exchange energy and the fluctuating nuclear field energy are comparable. From measurement of the Zeeman-induced P-SB lifting, we derive the exchange energy as a function of inter-dot level detuning. We confirm enhancement of exchange energy by resonance, and use Hubbard model calculation to account for it.