Valley-polarized magnetoconductivity and particle-hole symmetry breaking in a periodically modulated α-T3 lattice

Valley-polarized magnetoconductivity and particle-hole symmetry breaking in a periodically... We explore the transport properties of a periodically modulated α-T3 lattice in the presence of a perpendicular magnetic field. The effect of the Berry phase on electrical conductivity oscillation, so-called Weiss oscillation, caused by the modulation-induced nonzero drift velocity of charge carriers is investigated. Employing linear response theory within the low-temperature regime, we analyze Weiss oscillation as a function of the external magnetic field for both electrically and magnetically modulated α-T3 lattices numerically as well as analytically. The Berry phase makes this hexagonal lattice structure behave differently than other two-dimensional fermionic systems. It causes a significant valley polarization in magnetoconductivity. Most interestingly, the combined effect of both modulations breaks the particle-hole symmetry and causes a smooth transition from even (odd) to odd (even) filling fraction corresponding to the density of states peaks by means of the Berry phase. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Physical Review B American Physical Society (APS)

Valley-polarized magnetoconductivity and particle-hole symmetry breaking in a periodically modulated α-T3 lattice

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Valley-polarized magnetoconductivity and particle-hole symmetry breaking in a periodically modulated α-T3 lattice

Abstract

We explore the transport properties of a periodically modulated α-T3 lattice in the presence of a perpendicular magnetic field. The effect of the Berry phase on electrical conductivity oscillation, so-called Weiss oscillation, caused by the modulation-induced nonzero drift velocity of charge carriers is investigated. Employing linear response theory within the low-temperature regime, we analyze Weiss oscillation as a function of the external magnetic field for both electrically and magnetically modulated α-T3 lattices numerically as well as analytically. The Berry phase makes this hexagonal lattice structure behave differently than other two-dimensional fermionic systems. It causes a significant valley polarization in magnetoconductivity. Most interestingly, the combined effect of both modulations breaks the particle-hole symmetry and causes a smooth transition from even (odd) to odd (even) filling fraction corresponding to the density of states peaks by means of the Berry phase.
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Publisher
American Physical Society (APS)
Copyright
Copyright © ©2017 American Physical Society
ISSN
1098-0121
eISSN
1550-235X
D.O.I.
10.1103/PhysRevB.96.045418
Publisher site
See Article on Publisher Site

Abstract

We explore the transport properties of a periodically modulated α-T3 lattice in the presence of a perpendicular magnetic field. The effect of the Berry phase on electrical conductivity oscillation, so-called Weiss oscillation, caused by the modulation-induced nonzero drift velocity of charge carriers is investigated. Employing linear response theory within the low-temperature regime, we analyze Weiss oscillation as a function of the external magnetic field for both electrically and magnetically modulated α-T3 lattices numerically as well as analytically. The Berry phase makes this hexagonal lattice structure behave differently than other two-dimensional fermionic systems. It causes a significant valley polarization in magnetoconductivity. Most interestingly, the combined effect of both modulations breaks the particle-hole symmetry and causes a smooth transition from even (odd) to odd (even) filling fraction corresponding to the density of states peaks by means of the Berry phase.

Journal

Physical Review BAmerican Physical Society (APS)

Published: Jul 17, 2017

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