Spectroscopic evidence of topological phase transition in the three-dimensional Dirac semimetal Cd-3(As1-xPx)(2)

Авторы: Thirupathaiah S., Morozov I., Kushnirenko Y., Fedorov A.V., Haubold E., Kim T.K., Shipunov G., Maksutova A., Kataeva O., Aswartham S., Buechner B., Borisenko S.V.
Журнал: Physical Review B
Том: 98
Номер: 8
Год издания: 2018
Издательство: American Physical Society
Местоположение издательства: United States
DOI: 10.1103/PhysRevB.98.085145
Аннотация: We study the low-energy electronic structure of three-dimensional Dirac semimetal, Cd-3(As1-xPx)(2 )[x = 0 and 0.34(3)], by employing angle-resolved photoemission spectroscopy (ARPES). We observe that the bulk Dirac states in Cd-3(As0.66P0.34)(2) are gapped out with an energy of 0.23 eV, contrary to the parent Cd3As2 in which the gapless Dirac states have been observed. Thus, our results confirm the earlier predicted topological phase transition in Cd3As2 with perturbation. We further notice that the critical P substitution concentration, at which the two Dirac points that are spread along the c-axis in Cd3As2 form a single Dirac point at Gamma, is much lower [x(c)(P) < 0.34(3)] than the predicted value of x(c) (P) = 0.9. Therefore, our results suggest that the nontrivial band topology of Cd3As2 is remarkably sensitive to the P substitution and can only survive over a narrow substitution range, i.e., 0 <= x(P) < 0.34(3).
Добавил в систему: Морозов Игорь Викторович

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