Show simple item record

dc.contributor.authorShastry, Karthiken_US
dc.date.accessioned2015-07-01T17:50:34Z
dc.date.available2015-07-01T17:50:34Z
dc.date.issued2014-12
dc.date.submittedJanuary 2014en_US
dc.identifier.otherDISS-12948en_US
dc.identifier.urihttp://hdl.handle.net/10106/24959
dc.description.abstractWe describe experiments aimed at probing the sticking of positrons to the surfaces of topological insulators performed at university of Texas at Arlington using the Positron Annihilation induced Auger electron Spectrometer. A magnetically guided beam was used to deposit positrons at the surface of Bi₂Te₂Se sample at energy of ~2eV. Peaks observed in the energy spectra and intensities of electrons emitted as a result of positron annihilation showed peaks at energies corresponding to Auger peaks in Bi and Te providing clear evidence of Auger emission associated with the annihilation of positrons in a surface bound state. Theoretical estimates of the binding energy of this state are compared with estimates obtained by measuring the incident beam energy threshold for secondary electron emission and the temperature dependence positronium emission. The experiments provide strong evidence for the existence of a positron bound state at the surface of Bi2Te2Se and indicate the practicality of using positron annihilation to selectively probe the critically important top most layer of topological insulator system.en_US
dc.description.sponsorshipWeiss, Alexander H.en_US
dc.language.isoenen_US
dc.publisherPhysicsen_US
dc.titleEvidence Of A Positron Bound State On The Surface Of A Topological Insulatoren_US
dc.typePh.D.en_US
dc.contributor.committeeChairWeiss, Alexander H.en_US
dc.degree.departmentPhysicsen_US
dc.degree.disciplinePhysicsen_US
dc.degree.grantorUniversity of Texas at Arlingtonen_US
dc.degree.leveldoctoralen_US
dc.degree.namePh.D.en_US


Files in this item

Thumbnail


This item appears in the following Collection(s)

Show simple item record