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Effect of excess charge carriers and fluid medium on the magnitude and sign of the Casimir-Lifshitz torque

Thiyam, P. LU ; Parashar, Prachi ; Shajesh, K. V. ; Malyi, O. I. ; Boström, M. ; Milton, K. A. ; Brevik, I. ; Forsman, J. LU and Persson, C. (2019) In Physical Review B 100(20).
Abstract

Last year, we reported a perturbative theory of the Casimir-Lifshitz torque between planar biaxially anisotropic materials in the retarded limit [Thiyam et al., Phys. Rev. Lett. 120, 131601 (201810.1103/PhysRevLett.120.131601)], which is applied here to study the change in sign and magnitude of the torque with separation distance in biaxial black phosphorus having excess charge carriers. The study is carried out both in vacuum and in a background fluid medium. The presence of extra charge carriers and that of an intervening fluid medium are both found to promote enhancement of the magnitude of the torque between identical slabs. The degree of enhancement of the magnitude of torque increases not only with an increased carrier... (More)

Last year, we reported a perturbative theory of the Casimir-Lifshitz torque between planar biaxially anisotropic materials in the retarded limit [Thiyam et al., Phys. Rev. Lett. 120, 131601 (201810.1103/PhysRevLett.120.131601)], which is applied here to study the change in sign and magnitude of the torque with separation distance in biaxial black phosphorus having excess charge carriers. The study is carried out both in vacuum and in a background fluid medium. The presence of extra charge carriers and that of an intervening fluid medium are both found to promote enhancement of the magnitude of the torque between identical slabs. The degree of enhancement of the magnitude of torque increases not only with an increased carrier concentration but also with separation distance. In the nonidentical case when different planes of anisotropic black phosphorus face each other, owing to the nonmonotonic characteristic of the sign-reversal effect of the torque, the enhancement by carrier addition and intervening medium also becomes nonmonotonic with distance. In the presence of a background medium, the nonmonotonic degree of enhancement of the torque with distance is observed even between identical slabs.

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author
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organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Physical Review B
volume
100
issue
20
article number
205403
publisher
American Physical Society
external identifiers
  • scopus:85075357236
ISSN
2469-9950
DOI
10.1103/PhysRevB.100.205403
language
English
LU publication?
yes
id
16dad608-75e1-4663-848f-e6488110f318
date added to LUP
2019-12-06 08:57:34
date last changed
2020-12-22 03:56:38
@article{16dad608-75e1-4663-848f-e6488110f318,
  abstract     = {<p>Last year, we reported a perturbative theory of the Casimir-Lifshitz torque between planar biaxially anisotropic materials in the retarded limit [Thiyam et al., Phys. Rev. Lett. 120, 131601 (201810.1103/PhysRevLett.120.131601)], which is applied here to study the change in sign and magnitude of the torque with separation distance in biaxial black phosphorus having excess charge carriers. The study is carried out both in vacuum and in a background fluid medium. The presence of extra charge carriers and that of an intervening fluid medium are both found to promote enhancement of the magnitude of the torque between identical slabs. The degree of enhancement of the magnitude of torque increases not only with an increased carrier concentration but also with separation distance. In the nonidentical case when different planes of anisotropic black phosphorus face each other, owing to the nonmonotonic characteristic of the sign-reversal effect of the torque, the enhancement by carrier addition and intervening medium also becomes nonmonotonic with distance. In the presence of a background medium, the nonmonotonic degree of enhancement of the torque with distance is observed even between identical slabs.</p>},
  author       = {Thiyam, P. and Parashar, Prachi and Shajesh, K. V. and Malyi, O. I. and Boström, M. and Milton, K. A. and Brevik, I. and Forsman, J. and Persson, C.},
  issn         = {2469-9950},
  language     = {eng},
  number       = {20},
  publisher    = {American Physical Society},
  series       = {Physical Review B},
  title        = {Effect of excess charge carriers and fluid medium on the magnitude and sign of the Casimir-Lifshitz torque},
  url          = {http://dx.doi.org/10.1103/PhysRevB.100.205403},
  doi          = {10.1103/PhysRevB.100.205403},
  volume       = {100},
  year         = {2019},
}