Alex Aperis
Researcher at Department of Physics and Astronomy; Materials Theory
- E-mail:
- alex.aperis@physics.uu.se
- Visiting address:
- Ångströmlaboratoriet, Lägerhyddsvägen 1
- Postal address:
- Box 516
751 20 UPPSALA
Researcher at Department of Physics and Astronomy; Materials Theory
- E-mail:
- alex.aperis@physics.uu.se
- Visiting address:
- Ångströmlaboratoriet, Lägerhyddsvägen 1
- Postal address:
- Box 516
751 20 UPPSALA
Systems developer at Department of Cell and Molecular Biology; NBIS - National Bioinformatics Infrastructure Sweden
- Visiting address:
- Husargatan 3
75237 Uppsala - Postal address:
- Box 596
75124 Uppsala
More information is available to staff who log in.
Short presentation
I am currently a member of the Development team of NBIS where I work as a System Developer on projects related to the Sensitive Data Archive (SDA).
My background is in software development and statistical & computational physics where I earned my PhD. During my research work I developed the Uppsala Superconductivity code (UppSC) that interfaces ab initio and state-of-the-art Eliashberg theory numerical calculations and provides material specific predictions for superconductors.
Research
My research combines the use of both mathematical and numerical methods. This includes Green function diagrammatic approaches like for example the use and development of Eliashberg theory but also writing code for performing computationally demanding numerical simulations in conjunction with ab initio methods. Specifically, my developed Uppsala Superconductivity code (UppSC), interfaces ab initio calculated properties of materials with state-of-the-art Eliashberg theory numerical calculations in order to provide quantitative, material specific predictions of superconducting properties. The output of the code can be used to simulate several experimental quantities like e.g. ARPES and tunneling spectra. A presentation of the code and a list of its capabilities can be found here.
I am particularly interested in the microscopic mechanism(s) of high temperature superconductivity (e.g. phonon and/or spin fluctuation mediated etc), unconventional superconductivity (including pair density waves), its competition or coexistence with other quantum states of matter (like e.g. Charge/Spin Density Waves and nematicity) and the resulting phenomenology and possible technological applications. Other topics of interest include topological materials like topological insulators and Dirac semimetals.
Examples of systems that I have worked on are,
2D materials like magic-angle twisted bilayer graphene (TBG), MgB2 and H-MgB2 monolayers, heterostructures like FeSe/SrTiO3, high-Tc and multiband superconductors like the iron based superconductors, hydrides and heavy fermions (e.g. CeCoIn5).
From the Press:
Publications
Selection of publications
- Multiband full-bandwidth anisotropic Eliashberg theory of interfacial electron-phonon coupling and high-Tc superconductivity in FeSe/SrTiO3 (2018)
- Distinct multiple fermionic states in a single topological metal (2018)
- Ab initio theory of magnetic-field-induced odd-frequency two-band superconductivity in MgB2 (2015)
- Magnetic-field-induced pattern of coexisting condensates in the superconducting state of CeCoIn5 (2010)
Recent publications
- Doping dependence and multichannel mediators of superconductivity (2024)
- Strong momentum-dependent electron-magnon renormalization of a surface resonance on iron (2022)
- Observation of anisotropic Dirac cones in the topological material Ti2Te2P (2022)
- Cascade of replica bands in flat-band systems (2021)
- Induced odd-frequency superconducting state in vertex-corrected Eliashberg theory (2021)
All publications
Articles
- Doping dependence and multichannel mediators of superconductivity (2024)
- Strong momentum-dependent electron-magnon renormalization of a surface resonance on iron (2022)
- Observation of anisotropic Dirac cones in the topological material Ti2Te2P (2022)
- Cascade of replica bands in flat-band systems (2021)
- Induced odd-frequency superconducting state in vertex-corrected Eliashberg theory (2021)
- Influence of phonon renormalization in Eliashberg theory for superconductivity in two- and three-dimensional systems (2021)
- Exploring multichannel superconductivity in ThFeAsN (2021)
- Unconventional superconductivity mediated solely by isotropic electron-phonon interaction (2021)
- Phonon-mode specific contributions to room-temperature superconductivity in atomic hydrogen at high pressures (2021)
- Prediction of an unusual trigonal phase of superconducting LaH10 stable at high pressures (2021)
- Influence of electron-phonon coupling strength on signatures of even and odd-frequency superconductivity (2020)
- Charge density waves beyond the Pauli paramagnetic limit in 2D systems (2020)
- Prominent Cooper pairing away from the Fermi level and its spectroscopic signature in twisted bilayer graphene (2020)
- Eliashberg theory for spin fluctuation mediated superconductivity (2020)
- Multichannel superconductivity of monolayer FeSe on SrTiO3 (2020)
- Full-bandwidth Eliashberg theory of superconductivity beyond Migdal's approximation (2020)
- High-Pressure Synthesis of Magnetic Neodymium Polyhydrides (2020)
- Hydrogen-Induced High-Temperature Superconductivity in Two-Dimensional Materials (2019)
- Increased performance of Matsubara space calculations (2019)
- Multiband full-bandwidth anisotropic Eliashberg theory of interfacial electron-phonon coupling and high-Tc superconductivity in FeSe/SrTiO3 (2018)
- Advanced first-principles theory of superconductivity including both lattice vibrations and spin fluctuations (2018)
- Discovery of topological nodal-line fermionic phase in a magnetic material GdSbTe (2018)
- Observation of gapless Dirac surface states in ZrGeTe (2018)
- Distinct multiple fermionic states in a single topological metal (2018)
- Self-consistent temperature dependence of quasiparticle bands in monolayer FeSe on SrTiO3 (2018)
- Evolution of multigap superconductivity in the atomically thin limit (2017)
- Free surfaces recast superconductivity in few-monolayer MgB2 (2017)
- Anisotropic type-I superconductivity and anomalous superfluid density in OsB2 (2016)
- Ab initio theory of magnetic-field-induced odd-frequency two-band superconductivity in MgB2 (2015)
- Nematicity from mixed S± + dx2-y2 states in iron-based superconductors (2015)
- Magnetic-field-induced chiral hidden order in URu2Si2 (2014)
- Small-q phonon-mediated unconventional superconductivity in the iron pnictides (2011)
- Magnetic-field-induced pattern of coexisting condensates in the superconducting state of CeCoIn5 (2010)