Superconductivity chiitiko chemuviri umo kuramba kwemagetsi kwechinhu kunodonha kusvika zero pane imwe tembiricha yakaoma.Iyo Bardeen-Cooper-Schrieffer (BCS) dzidziso itsananguro inoshanda, iyo inotsanangura iyo superconductivity muzvinhu zvakawanda.Inotaridza kuti Cooper electron pairs inoumbwa mucrystal lattice patembiricha yakaderera, uye kuti BCS superconductivity inobva mukunyungudutswa kwavo.Kunyange zvazvo graphene pachayo iri shasha yemagetsi conductor, hairatidzi BCS superconductivity nekuda kwekudzvinyirirwa kwekudyidzana kweelectron-phonon.Ichi ndicho chikonzero maconductor akawanda "akanaka" (akadai segoridhe nemhangura) ari "akaipa" superconductors.
Vatsvagiri veCentre for Theoretical Physics of Complex Systems (PCS) paInstitute of Basic Science (IBS, South Korea) vakashuma imwe nzira itsva yekuwana superconductivity mugraphene.Vakabudirira kuita izvi nekukurudzira sisitimu yakasanganiswa inoumbwa negraphene uye maviri-dimensional Bose-Einstein condensate (BEC).Tsvagiridzo iyi yakaburitswa mujenari 2D Materials.
A hybrid system ine erekitironi gasi (yepamusoro layer) mugraphene, yakaparadzaniswa kubva kune maviri-dimensional Bose-Einstein condensate, inomiririrwa neasina kunanga excitons (yebhuruu uye tsvuku akaturikidzana).Maerekitironi nemaexcitons ari mugraphene anobatanidzwa neCoulomb force.
(a) Kutsamira kwetembiricha yemugero we superconducting muchirongwan-mediated process nekugadzirisa tembiricha (dashed line) uye pasina kururamisa tembiricha (yakasimba mutsara).(b) Iyo yakanyanya kupisa tembiricha ye superconducting shanduko senge basa re condensate density for bogolon-mediated interactions ne (red dashed line) uye pasina (black solid line) tembiricha kugadzirisa.Mutsetse weblue dotted unoratidza iyo BKT shanduko yekushisa sebasa re condensate density.
Mukuwedzera kune superconductivity, BEC chimwe chiitiko chinoitika pakudzika kwakadzika.Ndiyo yechishanu mamiriro ezvinhu akatanga kufanotaurwa naEinstein muna 1924. Kuumbwa kweBEC kunoitika apo maatomu ane simba shoma anoungana pamwe chete opinda munzvimbo imwe chete yesimba, inova nzvimbo yekutsvakurudza kwakadzama mufizikisi yenyaya yakapfupikiswa.Iyo yakasanganiswa Bose-Fermi sisitimu inomiririra kupindirana kwechikamu chemaerekitironi nechikamu chebhosoni, senge indirect excitons, exciton-polarons, zvichingodaro.Kudyidzana pakati peBose neFermi zvimedu kwakatungamira kune dzakasiyana siyana uye dzinonakidza zviitiko, izvo zvakamutsa kufarira kwevaviri mapato.Maonero ekutanga uye ekushandisa.
Mune basa iri, vatsvakurudzi vakashuma imwe itsva superconducting mechanism mu graphene, iyo inokonzerwa nekubatana pakati pe electrons ne "bogolons" panzvimbo pemaphononi mune yakajairwa BCS system.Bogolons kana Bogoliubov quasiparticles ndeyekunakidzwa muBEC, ine mamwe maitiro ezvimedu.Mukati memamwe maparamita, iyi michina inobvumira iyo superconducting yakakosha tembiricha mugraphene kusvika yakakwira se70 Kelvin.Vatsvaguri vakagadzirawo dzidziso nyowani yemicroscopic BCS inotarisisa masisitimu anobva pane itsva hybrid graphene.Iyo modhi yavakaronga zvakare inofanotaura kuti iyo superconducting zvivakwa inogona kuwedzera nekushisa, zvichikonzera kusava ne-monotonic tembiricha kutsamira kweiyo superconducting gap.
Mukuwedzera, zvidzidzo zvakaratidza kuti Dirac dispersion ye graphene inochengetedzwa mune iyi bogolon-mediated scheme.Izvi zvinoratidza kuti iyi superconducting mechanism inosanganisira maerekitironi ane relativistic dispersion, uye chiitiko ichi hachina kunyatsoongororwa mufizikisi yenyaya.
Iri basa rinoratidza imwe nzira yekuwana yakakwirira-tembiricha superconductivity.Panguva imwecheteyo, nekudzora zvinhu zve condensate, tinogona kugadzirisa superconductivity ye graphene.Izvi zvinoratidza imwe nzira yekudzora superconducting zvishandiso mune ramangwana.
Nguva yekutumira: Jul-16-2021 
