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SUMMARY:Nature and Role of Interstitial States in Infinite-Layer Nickelate
  Superconductors
DTSTART;VALUE=DATE-TIME:20260603T020000Z
DTEND;VALUE=DATE-TIME:20260603T030000Z
DTSTAMP;VALUE=DATE-TIME:20260704T034900Z
UID:indico-event-5081@indico-tdli.sjtu.edu.cn
DESCRIPTION:Speakers: Gang Li（李刚） (ShanghaiTech University)\n\nHos
 t: Prof. Ruidan Zhong  Venue: TDLI Meeting Room N400Tencent Meeting lin
 k: https://meeting.tencent.com/dm/IqfefDVwM4aW Meeting ID: 967837492\, n
 o password Abstract:Infinite-layer nickelates are widely considered to sh
 are key characteristics with cuprate high-temperature superconductors\, in
 cluding similar valence states and fundamental structural units. However\,
  unlike cuprates\, nickelates possess an additional electron pocket at the
  A-point of the Brillouin zone\, the nature and role of which remain uncle
 ar. The debate over this electron pocket is central to determining whether
  these emerging superconductors are best described by a single-band or mul
 ti-band model and has implications for their pairing symmetry. In this tal
 k\, we employ quantum topological chemistry theory to link this interstiti
 al state to an obstructed charge center. Our analysis reveals that the int
 erstitial state exhibits definite s-orbital symmetry and occupies a fixed 
 position in the crystal structure—both properties dictated by its obstru
 cted character. We further demonstrate that while the occupation of this i
 nterstitial state stabilizes the crystal structure and preserves the Ni–
 d9 valence configuration\, it does not appear to enhance superconductivity
  or contribute additional electron screening. By further tracing the hole 
 distribution\, we provide a picture supporting the interstitial state as a
  charge donor which enhancing band renormalization of the Ni–3d x2-y2 or
 bital by increasing its electron occupancy. These results reinforce the vi
 ew that superconductivity in infinite-layer nickelates is predominantly go
 verned by a single-band mechanism. Reference:Hongbin Qu\, Guang-Ming Zhan
 g\, and Gang Li\, arXiv:2507.10364Gang Li\, Guang-Ming Zhang\, et al. (to 
 be submitted) Biography:Gang Li is a tenured associate professor and rese
 archer at ShanghaiTech University\, selected for Shanghai Municipal and Na
 tional Talent Programs. He received his Ph.D. from the University of Bonn\
 , Germany\, in 2009. He subsequently held postdoctoral positions at the Un
 iversity of Würzburg\, Germany\, and TU Wien\, Austria\, and served as a 
 joint researcher in a major German national project. He joined ShanghaiTec
 h University in February 2017. Dr. Li’s research focuses on computationa
 l and theoretical studies of strongly correlated electron materials and to
 pological quantum materials. By extending and applying dynamical mean-fiel
 d type many-body methods\, he investigates various emergent quantum states
  in condensed matter\, including quantum spin liquid states and unconventi
 onal superconductivity. \n\nhttps://indico-tdli.sjtu.edu.cn/event/5081/
LOCATION:Tsung-Dao Lee Institute/N4F-N400 - meeting room (Tsung-Dao Lee In
 stitute)
URL:https://indico-tdli.sjtu.edu.cn/event/5081/
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