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Nematic quantum phase transition induced by transverse fields in strongly correlated electron systems

Grant number: 17/16911-3
Support Opportunities:Scholarships abroad - Research Internship - Post-doctor
Effective date (Start): December 01, 2017
Effective date (End): November 30, 2018
Field of knowledge:Physical Sciences and Mathematics - Physics - Condensed Matter Physics
Principal Investigator:Eduardo Miranda
Grantee:Vanuildo Silva de Carvalho
Supervisor: Rafael Monteiro Fernandes
Host Institution: Instituto de Física Gleb Wataghin (IFGW). Universidade Estadual de Campinas (UNICAMP). Campinas , SP, Brazil
Research place: University of Minnesota (U of M), United States  
Associated to the scholarship:16/05069-7 - Study of transport properties of low-energy models relevant to cuprate superconductors and quantum spin liquids, BP.PD


We describe here the main physical properties of unconventional high-temperature superconductors containing iron in their structures, the so-called iron-based superconductors (FeSCs). The phase diagram of these materials exhibits a plethora of collective fluctuations besides superconductivity, which includes a long range magnetic ordering of the stripe-type and also nematic order. In most of the FeSCs, both magnetic and nematic phases coexist for a large range of doping and disappear at a putative quantum critical point (QCP) under the superconducting dome. As recently pointed out in the literature, these features of the phase diagram of the FeSCs can be captured by orbital-projected band models, which takes into account the fermionic degrees of freedom near the Fermi pockets and the orbital content of the interactions. We also discuss here the issues to address the role of quantum nematic fluctuations for the formation of unconventional pairing states in FeSCs. In particular, we mention the recent theoretical proposal by Maharaj and collaborators [arXiv:1704.07841 (2017)] of using transverse fields (for instance, shear strain or perpendicular magnetic field) to continuously tune the nematic QCP by enhancing the nematic quantum fluctuations. This leads us to propose in this BEPE post-doc project the investigation of the critical properties for an effective theory of an orbital-projected band model subjected to transverse fields. The methodology here will be based on the application of Landau-Ginzburg analysis and the field-theoretical renormalization group method. The last topics of this project include the schedule for its implementation, the way we disseminate the results and, finally, the corresponding references. (AU)

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Scientific publications
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
DE CARVALHO, VANUILDO S.; CHUBUKOV, V, ANDREY; FERNANDES, RAFAEL M.. Thermodynamic signatures of an antiferromagnetic quantum critical point inside a superconducting dome. Physical Review B, v. 102, n. 4, . (16/05069-7, 17/16911-3)
DE CARVALHO, V. S.; FERNANDES, R. M.. Resistivity near a nematic quantum critical point: Impact of acoustic phonons. Physical Review B, v. 100, n. 11, . (17/16911-3)

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