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UID:DSC-18043
DTSTART;TZID=Europe/Berlin:20210615T145000
SEQUENCE:1623708533
TRANSP:OPAQUE
DTEND;TZID=Europe/Berlin:20210615T162000
URL:https://dresden-science-calendar.de/calendar/en/detail/18043
LOCATION:TUD\,    
SUMMARY:Ke: Propagating spinons and magnons in coupled quantum spin chains
CLASS:PUBLIC
DESCRIPTION:Speaker: Xianglin Ke\nInstitute of Speaker: Michigan State Univ
 ersity\nTopics:\nPhysik\n Location:\n  Name: TUD ()\n  Street:   \n  City:
   \n  Phone: \n  Fax: \nDescription: <p><strong>Abstract:</strong></p>  <p
 >In conventional magnets with magnetic long range order (LRO)\, low-energy
  excitations are carried by spin waves\, represented by massless bosons ca
 lled magnons with S = 1. However\, in one-dimensional (1D) antiferromagnet
 ic quantum spin systems\, quantum fluctuations destroy LRO. Their low-ener
 gy excitations are spinons\, a fractionalized fermion with S = 1/2\, inste
 ad of magnons. In quasi-1D antiferromagnets with quantum spins\, magnetic 
 excitations are carried by either magnons or spinons in different energy r
 egimes: they do not coexist independently\, nor could they interact with e
 ach other. In this seminar\, I will present our recent neutron scattering 
 and theoretical studies of a unique quasi-1D quantum spin system\, Cu2(OH)
 3Br\, which consists of weakly-coupled\, ferromagnetic and antiferromagnet
 ic alternating chains. As a result\, this system shows coexistence of two 
 different magnetic quasiparticles: the ferromagnetic chains give rise to c
 onventional magnon excitations\, while the antiferromagnetic chains yield 
 spinons. In addition\, I will show that these magnetic quasiparticles inte
 ract via weak interchain interactions\, leading to gap opening of magnetic
  excitations and asymmetric spectral weight.</p>  <p><strong>Host:</strong
 > D. Inosov</p>  <p><strong>BigBlueButton: </strong></p>  <p>https://selfs
 ervice.zih.tu-dresden.de/l/link.php?m=118900&amp\;p=e819ae07 (https://self
 service.zih.tu-dresden.de/l/link.php?m=118900&amp\;p=e819ae07) (TUD)</p>  
 <p>https://selfservice.zih.tu-dresden.de/link.php?m=118900&amp\;p=d3a426d2
  (https://selfservice.zih.tu-dresden.de/link.php?m=118900&amp\;p=d3a426d2)
  (external)</p>
DTSTAMP:20261017T122220Z
CREATED:20210601T220903Z
LAST-MODIFIED:20210614T220853Z
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