Dislocations in stripes and lattice Dirac fermions

Leiden Repository

Dislocations in stripes and lattice Dirac fermions

Type: Doctoral Thesis
Title: Dislocations in stripes and lattice Dirac fermions
Author: Mesaroš, Andrej
Publisher: Institute Lorentz for Theoretical Physics, Faculty of Science, Leiden University
Issue Date: 2010-10-06
Keywords: Dislocations
Grain boundaries
Graphene
Majorana
Nematic
Pseudogap phase
Stripes
Torsion
Zero modes
Abstract: The central topic in this thesis is the effect of topological defects in two distinct types of condensed matter systems. The first type consists of graphene and topological insulators. By studying the long-range effect of lattice defects (dislocations and disclinations) we find that the graphene electrons mimic fundamental Dirac electrons in spaces with curvature and torsion. We show that these long-range effects influence interferometric transport measurements: (i) Emphasizing the importance of electron dephasing in graphene; (ii) Enabling a characterization of neutral Majorana states, which are important for quantum computation applications, and conjectured to exist in topological insulators. Considering also the microscopic structure of graphene dislocations, we interpret local tunneling experiments on graphite grain boundaries. The second type of systems we study are the high temperature cuprate superconductors, where the strongly interacting electrons lead to coexisting symmetry breaking orders in the pseudogap phase. We observe and describe the interplay of nematic (orientational) and stripe (translational) orderings in local tunneling experiments, with stripe dislocations playing the key role. We also describe the observed phonon anomaly in cuprates through the effect of metallic stripes.
Description: Promotor: J. Zaanen
With summary in Dutch
Faculty: Faculteit der Wiskunde en Natuurwetenschappen
Citation: Mesaroš, A., 2010, Doctoral thesis, Leiden University
Series/Report no.: Casimir PHD series ; 2010-20
ISBN: 9789085930860
Handle: http://hdl.handle.net/1887/16013
 

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application/pdf Title_page_Contents 69.43Kb View/Open
application/pdf Chapter 1 Introduction 349.5Kb View/Open
application/pdf Chapter 2 157.3Kb View/Open Full text at publisher site
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application/pdf Chapter 8 Conclusions 60.22Kb View/Open
application/pdf Bibliography 66.56Kb View/Open
application/pdf Summary in Dutch 55.00Kb View/Open
application/pdf Summary 53.57Kb View/Open
application/pdf Publications_Curriculum Vitae_Acknowledgements 49.19Kb View/Open
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