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Academy of Mathematics and Systems Science, CAS Colloquia & Seminars：Wormholes, Berry phases and factorization
虫洞 浆果阶段 因子分解 编码拓扑信息
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2023/5/15
I shall start by reviewing the connection between the wormholes and entanglement in the context of AdS/CFT. I shall then show how the Berry phase, a geometrical phase encoding information about the to...
Quantum Thermalization and Novel Phases in Non-equilibrium Quantum Systems
Quantum Thermalization Non-equilibrium Quantum Systems Novel Phases
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2023/1/4
Universal quantum computers offer us the opportunities to implement novel quantum matter far away from equilibrium states. There has been remarkable progress in our understanding of the non-ergodic an...
Classical phases and quantum angles in the description of interfering Bose-Einstein condensates
Condensate random variables measurements
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2014/12/19
The interference of two Bose-Einstein condensates, initially in Fock states, can be described in terms of their relative phase, treated as a random unknown variable. This phase can be understood eithe...
Nanoscale layering of antiferromagnetic and superconducting phases in Rb2Fe4Se5
Nanoscale layering antiferromagnetic superconducting phases Rb2Fe4Se5
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2012/2/27
We studied phase separation in a single-crystalline antiferromagnetic superconductor Rb2Fe4Se5 (RFS) using a combination of scattering-type scanning near-field optical microscopy (s-SNOM) and low-ener...
Magnetic phases in the one-dimensional Kondo chain on a metallic surface
Magnetic phases the one-dimensional Kondo chain metallic surface
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2012/2/27
We study the low-temperature properties of a one-dimensional spin-1/2 chain of magnetic impurities coupled to a (normal) metal environment by means of anisotropic Kondo exchange. In the case of easy-p...
The Superconducting Phases of URu2Si2: Longitudinal Sound Velocity Measurements
Superconducting Phases URu2Si2 Longitudinal Sound Velocity Measurements
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2012/2/27
High resolution longitudinal sound velocity measurements in a magnetic field performed in the temperature tending to zero limit reveal two distinct signatures attributable to multiple superconducting ...
Can We Rigorously Define Phases in a Finite System?
Finite System nuclear liquid
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2011/7/20
Here we propose the generalized statistical multifragmentation model which includes the liquid phase pressure of the most general form. This allows us to get rid of the absolute incompressibility of t...
Edge states and topological phases in non-Hermitian systems
Edge states topological phases non-Hermitian systems Mesoscale and Nanoscale Physics
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2011/9/30
Abstract: Topological stability of the edge states is investigated for non-Hermitian systems. We examine two classes of non-Hermitian Hamiltonians supporting real bulk eigenenergies in weak non-Hermit...
Galois Conjugates of Topological Phases
conformal field theories topological quantum field theories Galois Conjugates
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2011/7/28
Abstract: Galois conjugation relates unitary conformal field theories (CFTs) and topological quantum field theories (TQFTs) to their non-unitary counterparts. Here we investigate Galois conjugates of ...
Concerning the Phases of Annual Variations of Nuclear Decay Rates
Annual Variations Nuclear Decay Rates
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2011/7/21
Recent analyses of datasets acquired at the Brookhaven National Laboratory and at the Physikalisch-Technische Bundesanstalt both show evidence of pronounced annual variations, suggestive of a solar in...
Conventional and charge six superfluids from melting hexagonal Fulde-Ferrell-Larkin-Ovchinnikov phases in two dimensions
Fulde-Ferrell-Larkin-Ovchinnikov two dimensions
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2011/9/13
We consider defect mediated melting of Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) and pair density wave (PDW) phases in two dimensions. Examining mean-field ground states in which the spatial oscillation...
Holographic Symmetry-Breaking Phases in AdS$_3$/CFT$_2$
Holographic Symmetry-Breaking Phases AdS$_3$/CFT$_2$
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2010/12/23
In this note we study the symmetry-breaking phases of 3D gravity coupled to matter. In particular, we consider black holes with scalar hair as a model of symmetry-breaking phases of a strongly coupled...
Interaction and filling induced quantum phases of dual Mott insulators of bosons and fermions
Interaction quantum phases of dual Mott insulators bosons fermions
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2010/11/24
Many-body effects are at the very heart of diverse phenomena found in condensed-matter physics.
One striking example is the Mott insulator phase where conductivity is suppressed as a result
of a str...
Competition between supersolid phases and magnetisation plateaux in the frustrated easy-axis antiferromagnet on a triangular lattice
Competition supersolid phases magnetisation plateaux frustrated easy-axis antiferromagnet
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2010/11/22
The majority of magnetic materials possess some degree of magnetic anisotropy, either at the level of a single ion, or in the exchange interactions between di erent magnetic ions. Where these exchange...
Topological phases and flat surface bands in superconductors without inversion symmetry
Topological phases flat surface bands superconductors without inversion symmetry
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2010/11/18
We examine different topological phases in three-dimensional non-centrosymmetric superconductors with time-reversal symmetry by using three different types of topological invariants. Due to the bulk b...