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

Thirupathaiah, S and Morozov, I and Kushnirenko, Y and Fedorov, A and Haubold, E and Kim, T K and Shipunov, G and Maksutova, A and Kataeva, O and Aswartham, S and Buechner, B and Borisenko, S (2018) Spectroscopic evidence of topological phase transition in the three-dimensional Dirac semimetal Cd-3(As1-xPx)(2). In: PHYSICAL REVIEW B, 98 (8).

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Abstract

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).

Item Type:	Journal Article
Publication:	PHYSICAL REVIEW B
Publisher:	AMER PHYSICAL SOC
Additional Information:	Copy right for this article belong to AMER PHYSICAL SOC, ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA
Department/Centre:	Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited:	12 Sep 2018 15:17
Last Modified:	12 Sep 2018 15:17
URI:	http://eprints.iisc.ac.in/id/eprint/60653

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