Heat carrying corner states of breathing Kagome
Heat conduction of the breathing Kagome lattice is discussed in relation to the anomalous heat-carrying corner states due to higher-order topology. Especially the use of the effective Hamiltonian for ...
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Z2× Z2 symmetry and Z4 quantization in bosonic ladders
A two-leg ladder is a nice place to discuss Z2× Z2 symmetry with sufficient numerical accuracy. Using a Z4 Berry phases, several phases of bosonic ladders are discussed in relation to the bulk-edge co...
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Hidenori Fukaya will be telling us on dyon & topological insulators
Condensed Matter Seminar June 29 (Thu.) 2023 10:30-11:30 Zoom https://us02web.zoom.us/j/88914003345?pwd=S096bldkZkd6QTNSL2h2WTl3d0RSdz09 Meeting ID: 889 1400 3345 Passcode: 662572 Title:Why monopole b...
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Negative index photonic crystal induces non hermitian physics
An electromagnetic field in a photonic crystal is described by a hermitian eigenvalue problem with an overlap matrix which may not be positive definite if the system is composed of negative index medi...
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Diophantine equation of SU(Q) topological pump
A topological pump of SU(Q) interacting fermions is proposed based on Affleck's SU(Q) quantum chains associated with a symmetric breaking term characterized by a parameter P/Q with co-prime intege...
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JPS Spring Meeting 2023
Meeting site
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APS March meeting 2023
APS March meeting, March 5–10, 2023 | Las Vegas, Nevada March 20–22, 2023 | Virtual Emergence of the non-Hermitian topology in generalized eigenvalue problems with Hermitian matrices Mon. March 6, 11:...
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Graphene, silicene and martini
Chemisorption on graphene and silicene may realize Martini type π-electron network. It implies specific band dispersion. We propose potential materialization by using the molecular orbital constr...
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Array of Martini glasses with topology
Taking a square root is not trivial. The Dirac equation is invented by the square root of the Kleind-Gordon equation. Then the lattice analog of the operation implies non-trivial topology and edge/cor...
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Novel critical states in random U(1) MO models in 2D
Using a molecular orbital (MO) construction scheme of the flat band which we are proposing, we found novel random critical states in a series of flat band systems away from the flat band energy. The M...
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Anyon superconductivity revisited : talk by Koji Kudo
Next Wednesday, Feb. 15 (2023), Koji Kudo (Penn state) visits us and will be telling on anyon superconductivity. The talk is hybrid. For the zoom link, contact me (email). Speaker: Koji Kudo Pennsylv...
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Topological strucure can be fragile against interactions
Topological protection of singularities for the non-Hermitian problem is one of the recent focuses in condensed matter physics. Exceptional points and rings with symmetry constraints are typical examp...
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Seminar by Tonomari Mizoguchi
Coming Wed. afternoon, 13:00, Dec.14, Tomonari Mizoguchi (Univ. Tsukuba) will be telling us about his work in collaboration with N. Okuma (Kyoto Univ.). The seminar is in a hybrid format. Please conta...
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Reduction of non-Hermitian 1D topology with interaction
Topological protection for topological systems may change by the inclusion of particle-particle interaction, which is known as "reduction phenomena." Here we have pointed out its possibiliti...
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Bulk-edge correspondence in electric circuits of topological pump
One of the recent wisdom for topological phases is the use of a classical system as a quantum simulator. The Hofstadter butterfly associated with topological phase transitions is realized in electric ...
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Localization 2022
Localisation 2022 T. Mizoguchi and Y. Hatsugai, "Gap opening and emergent critical states in a random-phase molecular-orbital model", Localisation 2022, Aug.25-30 (2022) T. Kuroda, T. Mizogu...
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Adiabatic connection with spin
Adiabatic connection of the gapped many-body states is a conceptual background of the topological phases. Historical and more than successful examples are given by various fractional quantum Hall stat...
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BEC seminar by Koji Kudo, Aug.10, 2022
On Aug.10 (Wed) 2022 at 11:am Japan time, Koji Kudo at Penn State will be telling us about his recent study by a title : "Exactly solvable model for non-Abelian quasiparticle states." Join u...
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“b 2– 4 ac” formula with rotation symmetry
The discriminant is a generalization of the "b 2- 4 ac" formula that everybody knows, which tells us the degeneracy of the (secular) equation. Then it is natural the discriminant is useful f...
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