Please use this identifier to cite or link to this item: http://hdl.handle.net/10995/101881
Title: Excitonic instability and unconventional pairing in the nodal-line materials ZrSiS and ZrSiSe
Authors: Scherer, M. M.
Honerkamp, C.
Rudenko, A. N.
Stepanov, E. A.
Lichtenstein, A. I.
Katsnelson, M. I.
Issue Date: 2018
Publisher: American Physical Society
Citation: Excitonic instability and unconventional pairing in the nodal-line materials ZrSiS and ZrSiSe / M. M. Scherer, C. Honerkamp, A. N. Rudenko, et al. — DOI 10.1103/PhysRevB.98.241112 // Physical Review B. — 2018. — Vol. 98. — Iss. 24. — 241112.
Abstract: We use a functional renormalization group (fRG) approach to investigate potential interaction-induced instabilities in a two-dimensional model for the Dirac nodal-line materials ZrSiS and ZrSiSe employing model parameters derived from ab initio calculations. Our results characterize the excitonic instability recently found in random-phase approximation for ZrSiS as an on-site spin-charge-degenerate exciton. Beyond this, we show that the fRG analysis produces an energy scale for the onset of the instability, in good agreement with the experimentally observed mass enhancement. Additionally, by exploring the parameter space of the model, we find that reducing the band splitting increases the instability scale and gives the chance to drive the system into an unconventional superconducting pairing state. The model parameters for the case of the structurally similar material ZrSiSe suggest the d-wave superconducting state as the leading instability with a very small critical scale. © 2018 American Physical Society.
Keywords: APPROXIMATION ALGORITHMS
CALCULATIONS
SELENIUM COMPOUNDS
SILICON COMPOUNDS
STABILITY
STATISTICAL MECHANICS
ZIRCONIUM COMPOUNDS
AB INITIO CALCULATIONS
FUNCTIONAL RENORMALIZATION GROUP
PARAMETER SPACES
RANDOM PHASE APPROXIMATIONS
SIMILAR MATERIAL
SUPERCONDUCTING PAIRING
SUPERCONDUCTING STATE
TWO DIMENSIONAL MODEL
SULFUR COMPOUNDS
URI: http://hdl.handle.net/10995/101881
Access: info:eu-repo/semantics/openAccess
SCOPUS ID: 85059515639
PURE ID: 8539238
b837a871-ca7a-43bb-99e8-367f8182ad4a
ISSN: 24699950
DOI: 10.1103/PhysRevB.98.241112
Appears in Collections:Научные публикации, проиндексированные в SCOPUS и WoS CC

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