Tomohiro Otsuka, Yuuki Sugihara, Jun Yoneda, Takashi Nakajima, Seigo Tarucha
We demonstrated a method to probe local electronic states and energy relaxation in quantum Hall edge states utilizing quantum point contacts. We evaluated relaxation lengths in the cases with electron tunneling and only with energy exchange between edge states. They were consistent with the results of previous experiments, and we have checked the validity of our method. We applied this method to measure the energy relaxation length around a hotspot in quantum Hall regimes and revealed the possible short-distance relaxation process as the relaxation due to energy exchange between edge states without electron tunneling.
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http://arxiv.org/abs/1304.7566
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