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DTSTAMP:20260424T143229Z
UID:1705408200@ist.ac.at
DTSTART:20240116T133000
DTEND:20240116T150000
DESCRIPTION:Speaker: Matthew Houtput\nhosted by Ragheed Alhyder\nAbstract: 
 In solid state physics\, the large polaron is a system consisting of an im
 purity electron interacting with a phonon field. It is is one of the most 
 fundamental and well-known problems of many-body physics. Large polarons a
 re often described using the Fröhlich Hamiltonian\, which assumes a linea
 r electron-phonon interaction. However\, in recent years significant inter
 est has been raised in additional interaction terms such as the 1-electron
 -2-phonon interaction. In our work\, Fröhlich theory is extended to inclu
 de 1-electron-2-phonon interaction for the solid state polaron. Additional
 ly\, the basic properties of the resulting polaron are studied.We derive a
 n analytical expression for the interaction strength of an electron coupli
 ng to LO phonons. For cubic materials\, the interaction strength only depe
 nds on a single scalar parameter\, making it well-suited for analytical ca
 lculations. Since the resulting Hamiltonian is quadratic\, we may investig
 ate several properties using the path integral formalism: these include th
 e energy and effective mass of the new polaron\, and formation of bipolaro
 ns. It is shown that the additional term leads to significant additional t
 rapping of the electron\, broadens the bipolaron stability regime\, and ca
 uses a secondary absorption peak in the optical conductivity.
LOCATION:Heinzel Seminar Room (I21.EG.101)\, Office Building West\, ISTA\, 
 ISTA
ORGANIZER:birgit.oosthuizen-noczil@ist.ac.at 
SUMMARY:Matthew Houtput: Beyond the Fröhlich Hamiltonian: Large polarons i
 n anharmonic solids
URL:https://talks-calendar.ista.ac.at/events/4708
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