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

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