Are Itinerant-Electron Quantum Critical Points Intrinsically Multicritical?
Lead Research Organisation:
Loughborough University
Department Name: Physics
Abstract
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Organisations
- Loughborough University (Lead Research Organisation)
- Max Planck Society (Collaboration)
- Karlsruhe Institute of Technology (Collaboration)
- Brookhaven National Laboratory (Collaboration)
- University of Wisconsin-Madison (Collaboration)
- Leibniz Association (Collaboration)
- University of Minnesota (Collaboration)
People |
ORCID iD |
| Joseph Betouras (Principal Investigator) |
Publications
Chubukov AV
(2014)
Non-Landau damping of magnetic excitations in systems with localized and itinerant electrons.
in Physical review letters
Langridge S
(2014)
Distinct magnetic phase transition at the surface of an antiferromagnet.
in Physical review letters
Noruzifar E
(2013)
Material dependence of the wire-particle Casimir interaction
in Physical Review A
Pollmann F
(2011)
Fermionic quantum dimer and fully-packed loop models on the square lattice
in Physical Review B
Rodriguez-Lopez P
(2014)
Dirac fermion time-Floquet crystal: Manipulating Dirac points
in Physical Review B
Rodriguez-Lopez P
(2015)
Effect of curvature and confinement on the Casimir-Polder interaction
in Physical Review A
Rodriguez-Lopez P
(2014)
Repulsive Casimir effect with Chern insulators.
in Physical review letters
Slizovskiy S
(2015)
Bound states of charges on top of graphene in a magnetic field
in Physical Review B
Slizovskiy S
(2012)
Nonlinear magnetization of graphene
in Physical Review B
Slizovskiy S
(2014)
Effect of paramagnetic fluctuations on a Fermi-surface topological transition in two dimensions
in Physical Review B
| Description | Interacting fermion systems play a very fundamental role in contemporary condensed matter physics. Interactions lead to different phases of the same material, depending on the external conditions and chemical controlled compositions. Some important phases exhibit magnetism or superconductivity and are very important for technological applications as well as for uncovering fundamental knowledge. During the period of this award, we did several studies, starting mostly from experimental results, where we provided explanations of existing data or predicted future ones. Our work involved materials that show quantum critical behavior at low temperatures with complex phases such as ferromagnetic superconductors and the compound sodium cobaltate. In addition, we worked with new materials such as graphene and topological insulators and cold atoms. The results were fundamental and general. In more detail: (i) we provided a microscopic explanation that used very sophisticated theoretical tools, on an 10-year old puzzle, posed by experiments on certain ferromagnetic superconductors that showed unexpected damping rate which was non-zero when it should (non-Landau damping). (ii) we put forward a detailed study of the effects of the interaction on the so-called Lifshitz transition in condensed matter. This is a transition where a new part of the Fermi surface, appears as a result of tuning an external parameter, making the Fermi surface to change topology. (iii) Put forward a theory to explain intriguing specific heat data of a compound NaxCoO2. (iv) We explain new data obtained at the surface of the antiferromagnet uranium dioxide, as a Kosterlitz-Thouless-Berezinskii transition. (v) Studied the magnetization properties in a magnetic field of graphene and the response to laser fields of graphene and topological insulators. |
| Exploitation Route | Our theoretical work provides guidance and explanations for experimental colleagues and also conceptual framework for fellow theorists. At this stage, they will be used by the research community for a deeper understanding of the behavior of quantum matter.Although the results are fundamental in character, the main objective to understand quantum matter and quantum phase transitions, have deep societal and economic impacts. The understanding of new materials that can be used in many different forms in new technologies and in the more focus research on quantum computing, has transformative impact and long term consequences in society. The work on ferromagnetic superconductors, surface magetism as well as the Lifshitz Fermi surface transition, can be very instrumental in understanding deeply materials that can have potential technological applications. Furthermore one publication that came from the collaboration of the PI, within this award, was about "how to test the quantumness of a quantum computer" where a procedure was put forward with very obvious consequences for the economy and the society. |
| Sectors | Electronics,Energy,Other |
| Description | Travel Exchange Grant |
| Amount | £12,000 (GBP) |
| Organisation | The Royal Society |
| Sector | Charity/Non Profit |
| Country | United Kingdom |
| Start | 06/2015 |
| End | 06/2017 |
| Description | Collaboration with Germany |
| Organisation | Karlsruhe Institute of Technology |
| Country | Germany |
| Sector | Academic/University |
| PI Contribution | Mainly designing the research and obtaining the results, writing the manuscripts. |
| Collaborator Contribution | Technical assistance or discussions. In some cases co-writing the papers. |
| Impact | Some outputs with co-authors Prof. Fulde, Dr Pollmann, Dr Efremov and Prof. Lander. |
| Start Year | 2010 |
| Description | Collaboration with Germany |
| Organisation | Leibniz Association |
| Department | Leibniz Institute for Solid State and Materials Research |
| Country | Germany |
| Sector | Academic/University |
| PI Contribution | Mainly designing the research and obtaining the results, writing the manuscripts. |
| Collaborator Contribution | Technical assistance or discussions. In some cases co-writing the papers. |
| Impact | Some outputs with co-authors Prof. Fulde, Dr Pollmann, Dr Efremov and Prof. Lander. |
| Start Year | 2010 |
| Description | Collaboration with Germany |
| Organisation | Max Planck Society |
| Department | Max Planck Institute for the Physics of Complex Systems |
| Country | Germany |
| Sector | Academic/University |
| PI Contribution | Mainly designing the research and obtaining the results, writing the manuscripts. |
| Collaborator Contribution | Technical assistance or discussions. In some cases co-writing the papers. |
| Impact | Some outputs with co-authors Prof. Fulde, Dr Pollmann, Dr Efremov and Prof. Lander. |
| Start Year | 2010 |
| Description | Collaborations in USA |
| Organisation | Brookhaven National Laboratory |
| Country | United States |
| Sector | Public |
| PI Contribution | Collaboration with the University of Wisconsin-Madison and the University of Minnesota: I and the member of my research team (i) were the main contributors in designing the research and setting it up, (ii) obtained results, (iii) got in touch with the experimentalists that did the experiment which we analyzed theoretically and (iv) wrote and submitted the papers. Collaboration with Brookhaven National Lab: I have worked on a theory on experimental data gathered mainly at Brookhaven National Lab. |
| Collaborator Contribution | My collaborator provided some technical assistance and input in writing the manuscripts. In addition, provided very useful feedback in other projects. My collaborator Andrey Chubukov has been a visiting researcher on the project "Controlling unconventional properties of correlated materials..." We published a paper in Phys. Rev. Lett. and he provided comments and suggestions on other parts of the project. |
| Impact | Two publications jointly with Prof. Andrey Chubukov. The PI in both was the corresponding author and the person who initiated and designed the research. One publication with Prof. Doon Gibbs from BNL. The most recent publication attributed to the project "Controlling unconventional properties of correlated materials by Fermi surface topological transitions and deformations" is Phys. Rev. Lett. 121, 097001 (2018) |
| Start Year | 2010 |
| Description | Collaborations in USA |
| Organisation | University of Minnesota |
| Country | United States |
| Sector | Academic/University |
| PI Contribution | Collaboration with the University of Wisconsin-Madison and the University of Minnesota: I and the member of my research team (i) were the main contributors in designing the research and setting it up, (ii) obtained results, (iii) got in touch with the experimentalists that did the experiment which we analyzed theoretically and (iv) wrote and submitted the papers. Collaboration with Brookhaven National Lab: I have worked on a theory on experimental data gathered mainly at Brookhaven National Lab. |
| Collaborator Contribution | My collaborator provided some technical assistance and input in writing the manuscripts. In addition, provided very useful feedback in other projects. My collaborator Andrey Chubukov has been a visiting researcher on the project "Controlling unconventional properties of correlated materials..." We published a paper in Phys. Rev. Lett. and he provided comments and suggestions on other parts of the project. |
| Impact | Two publications jointly with Prof. Andrey Chubukov. The PI in both was the corresponding author and the person who initiated and designed the research. One publication with Prof. Doon Gibbs from BNL. The most recent publication attributed to the project "Controlling unconventional properties of correlated materials by Fermi surface topological transitions and deformations" is Phys. Rev. Lett. 121, 097001 (2018) |
| Start Year | 2010 |
| Description | Collaborations in USA |
| Organisation | University of Wisconsin-Madison |
| Country | United States |
| Sector | Academic/University |
| PI Contribution | Collaboration with the University of Wisconsin-Madison and the University of Minnesota: I and the member of my research team (i) were the main contributors in designing the research and setting it up, (ii) obtained results, (iii) got in touch with the experimentalists that did the experiment which we analyzed theoretically and (iv) wrote and submitted the papers. Collaboration with Brookhaven National Lab: I have worked on a theory on experimental data gathered mainly at Brookhaven National Lab. |
| Collaborator Contribution | My collaborator provided some technical assistance and input in writing the manuscripts. In addition, provided very useful feedback in other projects. My collaborator Andrey Chubukov has been a visiting researcher on the project "Controlling unconventional properties of correlated materials..." We published a paper in Phys. Rev. Lett. and he provided comments and suggestions on other parts of the project. |
| Impact | Two publications jointly with Prof. Andrey Chubukov. The PI in both was the corresponding author and the person who initiated and designed the research. One publication with Prof. Doon Gibbs from BNL. The most recent publication attributed to the project "Controlling unconventional properties of correlated materials by Fermi surface topological transitions and deformations" is Phys. Rev. Lett. 121, 097001 (2018) |
| Start Year | 2010 |