2017年真空・表面科学合同講演会特集号 [III]
超ミクロンスケール系に適用可能な新しい量子輸送シミュレーション手法の開発
キーワード:
large-scale simulation,
carbon nanotubes,
electronic transport,
electron-phonon scattering,
decoherence
2018 年 61 巻 6 号 p. 360-365
詳細
2018 年 61 巻 6 号 p. 360-365
We propose a new quantum transport simulation method to investigate electronic transport with thermal atomic vibrations. Advantages of the simulation method are applicable to a super-micro-scale open system and to the direct evaluation of quantum decoherence from time-dependent current unlike conventional methods. In the present study, we investigate ballistic-diffusive crossover of metallic carbon nanotubes at room temperature and estimate mean free path characterizing the crossover and confirm that the results coincide with previous studies. Moreover, utilizing usefulness of our method, we succeed in evaluation of coherent-incoherent crossover and estimation of phase coherence length characterizing the crossover.
