Ultrafast quenching of the exchange interaction in a Mott insulator
We investigate how fast and how effective photocarrier excitation can modify the exchange interaction J_{ex} in the prototype Mott-Hubbard insulator. We demonstrate an ultrafast quenching of J_{ex} both by evaluating exchange integrals from a time-dependent response formalism and by explicitly simul...
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| Published in: | Physical review letters Vol. 113; no. 5; p. 057201 |
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| Main Authors: | , |
| Format: | Journal Article |
| Language: | English |
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01-08-2014
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| Abstract | We investigate how fast and how effective photocarrier excitation can modify the exchange interaction J_{ex} in the prototype Mott-Hubbard insulator. We demonstrate an ultrafast quenching of J_{ex} both by evaluating exchange integrals from a time-dependent response formalism and by explicitly simulating laser-induced spin precession in an antiferromagnet that is canted by an external magnetic field. In both cases, the electron dynamics is obtained from nonequilibrium dynamical mean-field theory. We find that the modified J_{ex} emerges already within a few electron hopping times after the pulse, with a reduction that is comparable to the effect of chemical doping. |
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| AbstractList | We investigate how fast and how effective photocarrier excitation can modify the exchange interaction Jex in the prototype Mott-Hubbard insulator. We demonstrate an ultrafast quenching of Jex both by evaluating exchange integrals from a time-dependent response formalism and by explicitly simulating laser-induced spin precession in an antiferromagnet that is canted by an external magnetic field. In both cases, the electron dynamics is obtained from nonequilibrium dynamical mean-field theory. We find that the modified Jex emerges already within a few electron hopping times after the pulse, with a reduction that is comparable to the effect of chemical doping. We investigate how fast and how effective photocarrier excitation can modify the exchange interaction J_{ex} in the prototype Mott-Hubbard insulator. We demonstrate an ultrafast quenching of J_{ex} both by evaluating exchange integrals from a time-dependent response formalism and by explicitly simulating laser-induced spin precession in an antiferromagnet that is canted by an external magnetic field. In both cases, the electron dynamics is obtained from nonequilibrium dynamical mean-field theory. We find that the modified J_{ex} emerges already within a few electron hopping times after the pulse, with a reduction that is comparable to the effect of chemical doping. |
| ArticleNumber | 057201 |
| Author | Eckstein, M Mentink, J H |
| Author_xml | – sequence: 1 givenname: J H surname: Mentink fullname: Mentink, J H organization: Max Planck Research Department for Structural Dynamics, University of Hamburg-CFEL, 22761 Hamburg, Germany – sequence: 2 givenname: M surname: Eckstein fullname: Eckstein, M organization: Max Planck Research Department for Structural Dynamics, University of Hamburg-CFEL, 22761 Hamburg, Germany |
| BackLink | https://www.ncbi.nlm.nih.gov/pubmed/25126933$$D View this record in MEDLINE/PubMed |
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| Snippet | We investigate how fast and how effective photocarrier excitation can modify the exchange interaction J_{ex} in the prototype Mott-Hubbard insulator. We... We investigate how fast and how effective photocarrier excitation can modify the exchange interaction Jex in the prototype Mott-Hubbard insulator. We... |
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| SubjectTerms | Exchange Filing Formalism Insulators Magnetic fields Precession Quenching Simulation |
| Title | Ultrafast quenching of the exchange interaction in a Mott insulator |
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