Negative differential conductance in a quantum dot and possible application to ESR detection

K. Hitachi, A. Inoue, A. Oiwa, M. Yamamoto, M. Pioro-Ladriere, Y. Tokura, S. Tarucha

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We propose a new scheme of detecting electron spin resonance (ESR) using a single quantum dot (QD). Suppose up-spin (down-spin) electrons can only transport through the ground (excited) state with a large (small) tunnel coupling. Negative differential conductance (NDC) appears when both states enter the transport window because of dynamical population of the excited state. This NDC can be restored by ESR when the dot-lead coupling of the ground and excited states is asymmetric between the two tunnel barriers. We first experimentally characterize the conditions of NDC, which appears when edge states are formed in the leads, to derive the parameters of tunnel coupling. We finally calculate the modulation of QD current induced by ESR to lift the NDC characteristic.

Original languageEnglish
Article number022026
JournalJournal of Physics: Conference Series
Issue number2
Publication statusPublished - 01-01-2009
Externally publishedYes


All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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