Casimir and electrostatic forces from Bi2Se3 thin films of varying thickness

Z. Babamahdi, V. B. Svetovoy, D. T. Yimam, B. J. Kooi, T. Banerjee, J. Moon, S. Oh, M. Enache, M. Stöhr, G. Palasantzas*

*Bijbehorende auteur voor dit werk

OnderzoeksoutputAcademicpeer review

2 Citaten (Scopus)
13 Downloads (Pure)


We explore here the decisive role of film thickness on Casimir and electrostatic forces from topological insulating Bi2Se3 films. The forces were measured for the Au-Bi2Se3 system under ambient conditions to simulate realistic applications. It is shown that the electrostatic forces associated with a nonzero contact potential of Vo∼200mV played a dominant role, and could not be compensated for thinner films (≤20nm thick). However, for thicker films the measured force, after voltage compensation, started to approach the genuine Casimir force in very good agreement with Lifshitz theory. Our results point out that any gradual deviation from theory for thinner films underlies the presence of strong electrostatic effects.

Originele taal-2English
Aantal pagina's5
TijdschriftPhysical Review B
Nummer van het tijdschrift16
StatusPublished - 7-apr-2021

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