Bulletin of the American Physical Society
APS March Meeting 2019
Volume 64, Number 2
Monday–Friday, March 4–8, 2019; Boston, Massachusetts
Session T70: Poster Session III(1:00pm-4:00pm)
1:00 PM,
Thursday, March 7, 2019
BCEC
Room: Exhibit Hall
Abstract: T70.00097 : Compressibility of the quantum spin Hall insulator HgTe*
Presenter:
Matthieu Dartiailh
(Physics, New York University)
Authors:
Matthieu Dartiailh
(Physics, New York University)
Simon Hartinger
(Physikalisches Institut (EP3), Universität Würzburg)
Alexandre Gourmelon
(Laboratoire Pierre Aigrain, Ecole Normale Supérieure, CNRS, PSL Research University, Université Pierre et Marie Curie, Sorbonne Universités, Université Denis Diderot)
Hugo Bartolomei
(Laboratoire Pierre Aigrain, Ecole Normale Supérieure, CNRS, PSL Research University, Université Pierre et Marie Curie, Sorbonne Universités, Université Denis Diderot)
Jean-Marc Berroir
(Laboratoire Pierre Aigrain, Ecole Normale Supérieure, CNRS, PSL Research University, Université Pierre et Marie Curie, Sorbonne Universités, Université Denis Diderot)
Hartmut Buhmann
(Physikalisches Institut (EP3), Universität Würzburg)
Laurens W Molenkamp
(Physikalisches Institut (EP3), Universität Würzburg)
Bernard Plaçais
(Laboratoire Pierre Aigrain, Ecole Normale Supérieure, CNRS, PSL Research University, Université Pierre et Marie Curie, Sorbonne Universités, Université Denis Diderot)
Erwann Bocquillon
(Laboratoire Pierre Aigrain, Ecole Normale Supérieure, CNRS, PSL Research University, Université Pierre et Marie Curie, Sorbonne Universités, Université Denis Diderot)
Here we report on the compressibility of the QSH insulator HgTe, measured in metal-oxyde-HgTe capacitors. The quantum capacitance reflects the expected band structure of the HgTe quantum wells. A capacitance minimum associated to a resistance maximum signal the QSH regime. We analyse the dependence of this minimum as a function of the capacitor size and identify both 2D and 1D contributions, which can be used to estimate the 1D channel size. Similar measurements performed on non-topological quantum wells do not show any sizable 1D contributions in agreement with the absence of edge states.
*We acknowledge support from the ERC StG Castles (Grant 758077)
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