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X-WR-CALDESC:Events for Theoretical Quantum Matter
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TZID:Europe/Stockholm
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DTSTART:20180325T010000
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DTSTART:20181028T010000
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DTSTART:20190331T010000
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BEGIN:VEVENT
DTSTART;TZID=Europe/Stockholm:20191122T110000
DTEND;TZID=Europe/Stockholm:20191122T170000
DTSTAMP:20260415T194949
CREATED:20191120T154913Z
LAST-MODIFIED:20200713T184820Z
UID:1598-1574420400-1574442000@tqmatter.org
SUMMARY:Kazuki Ikeda (Osaka) - Mathematics and Physics of Hofstadter Butterfly\, and Quantum Computation 
DESCRIPTION:Speaker: Kazuki Ikeda from Osaka university.\nTitle: Mathematics and Physics of Hofstadter Butterfly\,\nand Quantum Computation\n\nAbstract:\nQuantum Hall effect (QHE) is one of the most important phenomena in condensed matter physics\, high energy physics\, and mathematical physics. Especially QHE is the crucial for the recent advances in symmetry protected topological phase and topological quantum computation. In my talk\, I’ll explain the mathematics and physics of QHE by the following plan.\n\nIn part 1\, I explain mathematical foundation of quantum Hall effect and Hofstadter butterfly from a viewpoint of the Langlands program\, which is the “grand unification theory” of mathematics. In part 2\, I address the Hofstadter problem on a lattice with defects. I show the energy spectra associated with the localised current around the defect appear in the energy gaps of fractal butterfly. In part 3\, I describe application of adiabatic quantum computation to the material search.
URL:https://tqmatter.org/event/kazuki-ikeda-osaka-mathematics-and-physics-of-hofstadter-butterfly-and-quantum-computation/
LOCATION:NORDITA // South  (Meeting Room 112.006B)\, Roslagstullsbacken 23\, Stockholm\, 106 91\, Sweden
CATEGORIES:Talks
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BEGIN:VEVENT
DTSTART;TZID=Europe/Stockholm:20191114T150000
DTEND;TZID=Europe/Stockholm:20191114T160000
DTSTAMP:20260415T194949
CREATED:20191114T102759Z
LAST-MODIFIED:20200713T184820Z
UID:1594-1573743600-1573747200@tqmatter.org
SUMMARY:[Colloquium] A. Balatsky - Dynamic Quantum Matter
DESCRIPTION:Speaker: Alexander Balatsky from NORDITA.\n \nTitle:  Dynamic Quantum Matter\nTime and place: Thursday November 14 at 15.15 (coffee and tea from 15.00) in the Oskar Klein auditorium FR4.
URL:https://tqmatter.org/event/colloquium-a-balatsky-dynamic-quantum-matter/
CATEGORIES:Talks
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BEGIN:VEVENT
DTSTART;TZID=Europe/Stockholm:20191107T164500
DTEND;TZID=Europe/Stockholm:20191107T171500
DTSTAMP:20260415T194949
CREATED:20191106T115259Z
LAST-MODIFIED:20191106T115259Z
UID:1582-1573145100-1573146900@tqmatter.org
SUMMARY:Di Peng - Antiferromagnetic order and possible quantum spin liquid in sodium doped 2\,2′-bipyridine  
DESCRIPTION:Antiferromagnetic order and possible quantum spin liquid in sodium doped 2\,2′-bipyridine\n \nDi Peng\nCenter for High Pressure Science and Technology Advanced Research\, Shanghai 201203\, China\n \nOrganic molecular solids with correlated electronics based on π-electron networks provide fertile ground for the search for peculiar materials\, including antiferromagnetic and quantum magnetism.  We report a development method for doping alkali metals into organic materials and forming a homogeneous phase together with the experimental discoveries of two antiferromagnetic phase in sodium doped 2\,2′-bipyridine at different molar ratios. An antiferromagnetic phase of 160 K is found in sodium-doped 2\,2′-bipyridine with a molar ratio of less than 1:1. Another antiferromagnetic phase with Neel temperature of 25 K is observed in samples with molar ratios of 1:1 and 1:2. Applying magnetic field can slowly suppress the 160 K antiferromagnetic phase\, while the 25 K antiferromagnetic phase is insensitive to the applied field rather than showing an increase of magnetization below 6 K. This behavior is consistent with the characteristics of quantum spin liquid\, in which strong quantum fluctuations lead to the disorder at low temperatures. We will discuss more about the experimental details about whether a strong spin frustrated antiferromagnetic phase is formed in sodium-doped 2\,2′-bipyridine and whether it enters a quantum spin liquid state at low temperatures.\n\n 
URL:https://tqmatter.org/event/di-peng-antiferromagnetic-order-and-possible-quantum-spin-liquid-in-sodium-doped-22%e2%80%b2-bipyridine/
CATEGORIES:Talks
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BEGIN:VEVENT
DTSTART;TZID=Europe/Stockholm:20191107T161500
DTEND;TZID=Europe/Stockholm:20191107T164500
DTSTAMP:20260415T194949
CREATED:20191106T115210Z
LAST-MODIFIED:20191106T115210Z
UID:1580-1573143300-1573145100@tqmatter.org
SUMMARY:Ren-Shu Wang - Exploring superconductivity in organobismuth molecules
DESCRIPTION:Exploring superconductivity in organobismuth molecules\n \nRen-Shu Wang\nCenter for High Pressure Science and Technology Advanced Research\, Shanghai 201203\, China\n \nRecently\, novel quantum phenomena such as topological insulators and superconductors were suggested in organometallic materials. Three different types of organobismuth molecules\, including triphenylbismuth (TPB)\, tri-p-tolylbismthine (p-TTB)\, and tri-o-tolylbismthine (o-TTB)\, were investigated to explore organic superconductivity by alkali metal doping. The target organic molecules have similar structures\, expect for the type and the position of the functional group. The dc and ac magnetic susceptibility\, and electrical resistivity measurements reveal that all these doped molecules exhibit superconductivity\, and their Tc’s vary from 3.5 (and/or 7.2) to 3.6 (and/or 5.3) and 3.6 K for K-doped TPB\, p-TTB\, and o-TTB\, respectively. The shield fractions (SFs) of the main superconducting phases at 1.8 K are 3.74%\, 18%\, and 17% for K-doped TPB\, p-TTB\, and o-TTB\, respectively. In comparison with TPB\, adding the -CH3 groups in p-TTB and o-TTB do not make much difference for Tc of main phase rather than bringing about the increase of the SF\, indicating that the simple addition of functional groups is an effective way to tune (super)conductivity in such materials. The main superconducting phases and their composition in these molecules are determined by combined studies of X-ray diffraction and theoretical calculations as well as Raman spectroscopy measurements. These findings enrich the applications of organometallic compounds in superconductivity and add a new electron-acceptor family of organic superconductors. \n\n  \n\n\n 
URL:https://tqmatter.org/event/ren-shu-wang-exploring-superconductivity-in-organobismuth-molecules/
LOCATION:NORDITA // South  (Meeting Room 112.006B)\, Roslagstullsbacken 23\, Stockholm\, 106 91\, Sweden
CATEGORIES:Talks
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Stockholm:20191001T150000
DTEND;TZID=Europe/Stockholm:20191001T170000
DTSTAMP:20260415T194949
CREATED:20190930T112341Z
LAST-MODIFIED:20190930T112341Z
UID:1755-1569942000-1569949200@tqmatter.org
SUMMARY:[Group Meeting] Sahar Pakdel
DESCRIPTION:Sahar Pakdel\, Aarhus University (Denmark) \nTitle: Exploring 2D-materials in synergy with experimentalists!”.\n\nAbstract: I will be talking about my experience studying some 2D systems with experimentalists. Specifically I will stress what I consider as the need for flexibility in the theory side while working on systems that are measured at the same time\, in comparison with exploring well-presented data.
URL:https://tqmatter.org/event/group-meeting-sahar-pakdel/
CATEGORIES:Group Meetings,Talks
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