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Title :Enhancements of the 3/2 and 5/2 frequencies of de Haas–van Alphen oscillations near the Lifshitz transition in a two-dimensional compensated metal with overtilted Dirac cones
Authors :Kishigi, Keita
Hasegawa, Yasumasa
Issue Date :25-Nov-2019
Citation jtitle :Physical Review B
vol. :100
no. :19
start page :195433-1
end page :195433-15
Abstract :We study the de Haas-van Alphen (dHvA) oscillations in the two-dimensional compensated metal with overtilted Dirac cones near the Lifshitz transition. We employ the tight-binding model of α−(BEDT−TTF)2I3, in which the massless Dirac fermions are realized. When a uniaxial pressure (P) along the y axis is applied above P≃0.2 kbar in α−(BEDT−TTF)2I3, one electron pocket, which encloses the overtilted Dirac points, is changed to two electron pockets, i.e., Lifshitz transition happens, while a hole pocket does not change a topology. We show that the Fourier components corresponding to the 3/2 and 5/2 areas of the hole pocket are anomalously enhanced in the region of pressure where the Lifshitz transition occurs. This phenomenon will be observed in the two-dimensional overtilted Dirac fermions near the Lifshitz transition.
URL :https://journals.aps.org/prb/abstract/10.1103/PhysRevB.100.195433
Type Local :雑誌掲載論文
ISSN :24699950
Publisher :American Physical Society
Rights :©2019 American Physical Society
URI :http://hdl.handle.net/2298/42841
Appears in Collections:Journal Article (Education)
Please use this identifier to cite or link to this item: http://hdl.handle.net/2298/42841