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Dive into the research topics where Laura Classen is active.

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Featured researches published by Laura Classen.


Physical Review Letters | 2017

Interplay between Magnetism, Superconductivity, and Orbital Order in 5-Pocket Model for Iron-Based Superconductors: Parquet Renormalization Group Study

Laura Classen; Rui Qi Xing; Maxim Khodas; Andrey V. Chubukov

We report the results of the parquet renormalization group (RG) analysis of the phase diagram of the most general 5-pocket model for Fe-based superconductors. We use as an input the orbital structure of excitations near the five pockets made out of d_{xz}, d_{yz}, and d_{xy} orbitals and argue that there are 40 different interactions between low-energy fermions in the orbital basis. All interactions flow under the RG, as one progressively integrates out fermions with higher energies. We find that the low-energy behavior is amazingly simple, despite the large number of interactions. Namely, at low energies the full 5-pocket model effectively reduces either to a 3-pocket model made of one d_{xy} hole pocket and two electron pockets or a 4-pocket model made of two d_{xz}/d_{yz} hole pockets and two electron pockets. The leading instability in the effective 4-pocket model is a spontaneous orbital (nematic) order, followed by s^{+-} superconductivity. In the effective 3-pocket model, orbital fluctuations are weaker, and the system develops either s^{+-} superconductivity or a stripe spin-density wave. In the latter case, nematicity is induced by composite spin fluctuations.


Physical Review B | 2017

Competing instabilities, orbital ordering, and splitting of band degeneracies from a parquet renormalization group analysis of a four-pocket model for iron-based superconductors: Application to FeSe

Rui Qi Xing; Laura Classen; Maxim Khodas; Andrey V. Chubukov

We report the results of a parquet renormalization group (RG) study of competing instabilities in the full 2D four pocket, three orbital low-energy model for iron-based superconductors. We derive and analyze the RG flow of the couplings, which describe all symmetry-allowed interactions between low-energy fermions. Despite that the number of the couplings is large, we argue that there are only two stable fixed trajectories of the RG flow and one weakly unstable fixed trajectory with a single unstable direction. Each fixed trajectory has a finite basin of attraction in the space of initial system parameters. On the stable trajectories, either interactions involving only


Physical Review B | 2016

Competition of density waves and quantum multicritical behavior in Dirac materials from functional renormalization

Laura Classen; Igor F. Herbut; Lukas Janssen; Michael M. Scherer

d_{xz}


Physical Review B | 2012

Interaction-induced charge and spin pumping through a quantum dot at finite bias

Hernan L. Calvo; Laura Classen; Janine Splettstoesser; M. R. Wegewijs

and


Physical Review Letters | 2018

Three-Dimensional Non-Fermi-Liquid Behavior from One-Dimensional Quantum Critical Local Moments

Laura Classen; Igor Zaliznyak; A. M. Tsvelik

d_{yz}


Physical Review B | 2014

Ground-state phase diagram of the half-filled bilayer Hubbard model

Michael Golor; Timo Reckling; Laura Classen; Michael M. Scherer; Stefan Wessel

or only


Physical Review B | 2017

Fluctuation-induced continuous transition and quantum criticality in Dirac semimetals

Laura Classen; Igor F. Herbut; Michael M. Scherer

d_{xy}


Physical Review B | 2015

Mott multicriticality of Dirac electrons in graphene

Laura Classen; Igor F. Herbut; Lukas Janssen; Michael M. Scherer

orbital components on the electron pockets dominate, while on the weakly unstable trajectory interactions involving


Physical Review B | 2014

Instabilities on graphene's honeycomb lattice with electron-phonon interactions

Laura Classen; Michael M. Scherer; Carsten Honerkamp

d_{xz}


arXiv: Strongly Correlated Electrons | 2018

3D non-Fermi liquid behavior from 1D quantum critical local moments.

Laura Classen; Igor Zaliznyak; A. M. Tsvelik

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Andrey V. Chubukov

University of Wisconsin-Madison

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A. M. Tsvelik

Brookhaven National Laboratory

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Rui Qi Xing

University of Minnesota

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M. R. Wegewijs

Forschungszentrum Jülich

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