Premium
Electrochemical Capacitance and Transit Time in Quantum Hall Conductors
Author(s) -
Delgard Adrien,
Chenaud Boris,
Mailly Dominique,
Gennser Ulf,
Ikushima Kenji,
Chaubet Christophe
Publication year - 2019
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.201800548
Subject(s) - quantum hall effect , condensed matter physics , quantum capacitance , capacitance , physics , electron , capacitive sensing , admittance , magnetic field , electrical engineering , quantum mechanics , electrode , electrical impedance , engineering
In a two dimensional electron gas, low energy transport in presence of a magnetic field occurs in chiral 1D channels located on the edge of the sample. In the AC description of quantum transport, the emittance determines the amplitude of the imaginary part of the admittance, whose sign and physical meaning are determined by the sample topology: a Hall bar is inductive while a Corbino ring is capacitive. In this article, the perfect capacitive character of Corbino samples in the quantum Hall effect regime is shown. A vanishing conductance and an electrochemical capacitance which depends on the density of states of 1D channels are measured. Our samples have no gate, neither on the side nor on the top, and the inner capacitances are measured. The transit time of electrons across the device is obtained and the drift velocity of carriers is deduced.