Edge capacitance of a two-dimensional topological insulator

M. V. Entin, L. Braginsky

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)


We study capacitance of the two-dimensional topological insulator (TI) edge states. The total capacitance is combined as a serial circuit of three capacitors presenting geometrical CG, quantum CQ, and correlation Ccorr contributions to the electron energy. If the Coulomb interaction is weak, they obey an inequality CG<CQ<Ccorr. Quantities CG and CQ are found in the case of a round TI dot. The quantum capacitance at the finite temperature is determined taking into account the edge states quantization with and without the magnetic field. We have concluded that, in the accepted approximations, Ccorr-1=0.

Original languageEnglish
Article number115403
Number of pages4
JournalPhysical Review B
Issue number11
Publication statusPublished - 1 Sep 2017


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