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DTSTAMP:20261017T181346Z
LAST-MODIFIED:20210407T185251Z
DTSTART:20210405T193000Z
DTEND:20210405T203000Z
UID:event2419@bu.edu
URL:http://physics.bu.edu/internal/events/show/2419
SUMMARY:A FUNCTIONAL RENORMALIZATION GROUP STUDY OF STRONGLY CORRELATED ELE
	CTRON SYSTEMS
DESCRIPTION:Featuring Nahom Yirga\, Boston University\, Physics Department\
	n\nPart of the Departmental Seminars.\n\nThis work is concerned with the ap
	plication of functional renormalization group\n(fRG) to the study of intera
	cting fermionic systems. We consider a decoupled for-\nmulation of the fRG 
	equations that retains much of the flow of relevant modes in\nthe system. T
	he decoupling is optimized in the frequency and momentum domains\nfor a gen
	eral multiband system of interacting electrons. This optimized decoupling\n
	is then used to derive the flow equations that describe fluctuations in mod
	el Hamil-\ntonians for Cuprate and Pnictide superconductors. Accounting for
	 the frequency\nmodes in the system allows us to explore the impact of coup
	ling phonons to these\nmodel Hamiltonians. We construct a full phase diagra
	m of the systems studied as\na function of doping\, temperature and couplin
	g. Alterations to the diagram due to\nelectron-phonon coupling is derived. 
	The results of the decoupled formulation is in\nagreement with results in t
	he literature for many of the models considered. Further\nthe fRG captures 
	the sensitivity of susceptibilities of Cuprate Hamiltonians to band\nstruct
	ure\, the enhanced role of Hunds coupling in Pnictide systems and the impac
	t\nof phonons in multiband Hamiltonians.
LOCATION: \, \, 
STATUS:CONFIRMED
CLASS:PUBLIC
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