Unusual Dirac Fermions on the Surface of a Noncentrosymmetric alpha-BiPd Superconductor

Thirupathaiah, S and Ghosh, Soumi and Jha, Rajveer and Rienks, EDL and Dolui, Kapildeb and Kishore, Ravi VV and Buechner, B and Das, Tanmoy and Awana, VPS and Sarma, DD and Fink, J (2016) Unusual Dirac Fermions on the Surface of a Noncentrosymmetric alpha-BiPd Superconductor. In: PHYSICAL REVIEW LETTERS, 117 (17).

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Abstract

Combining multiple emergent correlated properties such as superconductivity and magnetism within the topological matrix can have exceptional consequences in garnering new and exotic physics. Here, we study the topological surface states from a noncentrosymmetric alpha-BiPd superconductor by employing angle-resolved photoemission spectroscopy and first-principles calculations. We observe that the Dirac surface states of this system have several interesting and unusual properties, compared to other topological surface states. The surface state is strongly anisotropic and the in-plane Fermi velocity varies rigorously on rotating the crystal about the y axis. Moreover, it acquires an unusual band gap as a function of k(y), possibly due to hybridization with bulk bands, detected upon varying the excitation energy. The coexistence of all the functional properties in addition to the unusual surface state characteristics make this an interesting material.

Item Type:	Journal Article
Publication:	PHYSICAL REVIEW LETTERS
Additional Information:	Copy right for this article belongs to the AMER PHYSICAL SOC, ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA
Department/Centre:	Division of Chemical Sciences > Solid State & Structural Chemistry Unit Division of Physical & Mathematical Sciences > Physics
Date Deposited:	03 Dec 2016 10:12
Last Modified:	03 Dec 2016 10:12
URI:	http://eprints.iisc.ac.in/id/eprint/55412

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