Di Pietro, P., Mitrano, M., Caramazza, S., Capitani, F., Lupi, S., Postorino, P., Ripanti, F., Joseph, B., Ehlen, N., Grüneis, A., Sanna, A., Profeta, G., Dore, P. and Perucchi, A. (2018). Emergent Dirac carriers across a pressure-induced Lifshitz transition in black phosphorus. Physical review B, 98. p. 165111. APS Physics. ISSN 2469-9969

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Abstract

The phase diagram of correlated systems like cuprate or pnictide high-temperature superconductors is likely defined by a topological change of the Fermi surface under continuous variation of an external parameter, the so-called Lifshitz transition. However, a number of low-temperature instabilities and the interplay of multiple energy scales complicate the study of this phenomenon. Here we identify the optical signatures of a pressure-induced Lifshitz transition in a clean elemental system, black phosphorus. By applying external pressures above 1.5 GPa, we observe a change in the pressure-dependent Drude plasma frequency due to the appearance of massless Dirac fermions. At higher pressures, optical signatures of two structural phase transitions are also identified. Our findings suggest that a key fingerprint of the Lifshitz transition, in the absence of structural transitions, is a Drude plasma frequency discontinuity due to a change in the Fermi surface topology.

Item Type: Journal Article
Creators:
CreatorsEmailORCID
Di Pietro, P.UNSPECIFIEDUNSPECIFIED
Mitrano, M.UNSPECIFIEDUNSPECIFIED
Caramazza, S.UNSPECIFIEDUNSPECIFIED
Capitani, F.UNSPECIFIEDUNSPECIFIED
Lupi, S.UNSPECIFIEDUNSPECIFIED
Postorino, P.UNSPECIFIEDUNSPECIFIED
Ripanti, F.UNSPECIFIEDUNSPECIFIED
Joseph, B.UNSPECIFIEDUNSPECIFIED
Ehlen, N.UNSPECIFIEDUNSPECIFIED
Grüneis, A.UNSPECIFIEDUNSPECIFIED
Sanna, A.UNSPECIFIEDUNSPECIFIED
Profeta, G.UNSPECIFIEDUNSPECIFIED
Dore, P.UNSPECIFIEDUNSPECIFIED
Perucchi, A.UNSPECIFIEDUNSPECIFIED
URN: urn:nbn:de:hbz:38-87104
DOI: 10.1103/PhysRevB.98.165111
Journal or Publication Title: Physical review B
Publisher: APS Physics
ISSN: 2469-9969
Volume: 98
Subjects: Natural sciences and mathematics
Physics
Faculty: Faculty of Mathematics and Natural Sciences
Divisions: Faculty of Mathematics and Natural Sciences > Institute of Physics II
Language: English
Date: 8 October 2018
Funders: ERC Grant No. 648589 “SUPER-2D”, IISc-ICTP fellowship
Projects: CRC 1238 (project A1), GR 3708/2-1
Refereed: Yes
Page Range: p. 165111
URI: http://kups.ub.uni-koeln.de/id/eprint/8710

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