Jan’s Publications

@article{WOS:000514392000002,

title = {Isolated zeros destroy Fermi surface in holographic models with a 

 lattice},

author = {Floris Balm and Alexander Krikun and Aurelio Romero-Bermudez and Koenraad Schalm and Jan Zaanen},

doi = {10.1007/JHEP01(2020)151},

issn = {1029-8479},

year  = {2020},

date = {2020-01-01},

journal = {JOURNAL OF HIGH ENERGY PHYSICS},

number = {1},

publisher = {SPRINGER},

address = {ONE NEW YORK PLAZA, SUITE 4600, NEW YORK, NY, UNITED STATES},

abstract = {We study the fermionic spectral density in a strongly correlated quantum 

 system described by a gravity dual. In the presence of periodically 

 modulated chemical potential, which models the effect of the ionic 

 lattice, we explore the shapes of the corresponding Fermi surfaces, 

 defined by the location of peaks in the spectral density at the Fermi 

 level. We find that at strong lattice potentials sectors of the Fermi 

 surface are unexpectedly destroyed and the Fermi surface becomes an 

 arc-like disconnected manifold. We explain this phenomenon in terms of a 

 collision of the Fermi surface pole with zeros of the fermionic Green's 

 function, which are explicitly computable in the holographic dual.},

keywords = {Holography and condensed matter physics (AdS/CMT); Space-Time Symmetries},

pubstate = {published},

tppubtype = {article}

}

@article{WOS:000387686000001,

title = {Holographic fermions at strong translational symmetry breaking: a 

 Bianchi-VII case study},

author = {A. Bagrov and N. Kaplis and A. Krikun and K. Schalm and J. Zaanen},

doi = {10.1007/JHEP11(2016)057},

issn = {1029-8479},

year  = {2016},

date = {2016-11-01},

journal = {JOURNAL OF HIGH ENERGY PHYSICS},

number = {11},

publisher = {SPRINGER},

address = {233 SPRING ST, NEW YORK, NY 10013 USA},

abstract = {It is presently unknown how strong lattice potentials influence the 

 fermion spectral function of the holographic strange metals predicted by 

 the AdS/CFT correspondence. This embodies a crucial test for the 

 application of holography to condensed matter experiments. We show that 

 for one particular momentum direction this spectrum can be computed for 

 arbitrary strength of the effective translational symmetry breaking 

 potential of the so-called Bianchi-VII geometry employing ordinary 

 differential equations. Deep in the strange metal regime we find rather 

 small changes to the single-fermion response computed by the emergent 

 quantum critical IR, even when the potential becomes relevant in the 

 infra-red. However, in the regime where holographic quasi-particles 

 occur, defining a Fermi surface in the continuum, they acquire a finite 

 lifetime at any finite potential strength. At the transition from 

 irrelevancy to relevancy of the Bianchi potential in the deep infra-red 

 the quasi-particle remnants disappear completely and the fermion 

 spectrum exhibits a purely relaxational behaviour.},

keywords = {Holography and condensed matter physics (AdS/CMT); Space-Time Symmetries},

pubstate = {published},

tppubtype = {article}

}