pre-TPS mini-workshop

Contribution List

1. Intrinsic non-Hermitian topological phases [Prof. Ken Shiozaki, YITP, Kyoto University]

12/01/2026, 10:00

Abstract:
Topological phases specific to non-Hermitian systems are point-gapped topological phases. Their Hamiltonians have no spectrum in the vicinity of a reference energy point and have finite topological invariants defined with respect to that point. A prototypical example is the spectral winding number, whose nontrivial value leads to the non-Hermitian skin effect. However, not all...

2. Entanglement-only quantum criticality: Dissociation of bulk and entanglement phase transitions in the Haldane phase [Dr. Yu-Chin Tzeng, NYCU]

12/01/2026, 10:45

Abstract:
The entanglement spectrum (ES) of the spin-1/2 ladder in the Haldane phase has long been interpreted as mimicking the gapless des Cloizeaux-Pearson dispersion of physical edge modes, a view established over 15 years ago based on the Li-Haldane correspondence. Here, we demonstrate that this prevailing picture is fundamentally incomplete. Using large-scale exact diagonalization up to...

3. Magic Entropy in Hybrid Spin-Boson Systems [Ying-Lin Li, NTHU]

12/01/2026, 11:30

Abstract:
Entanglement is widely recognised as a central feature distinguishing quantum and classical correlations, yet it alone does not determine the computational complexity of quantum many-body systems. There exist quantum states that are strongly entangled but still efficiently simulable by classical means, such as stabilizer states generated by Clifford circuits. This observation...

4. Lunch break

12/01/2026, 12:00

5. Nonreciprocal Transport Induced by Loop Current Order [Prof. Rina Tazai, YITP, Kyoto University]

12/01/2026, 13:15

Abstract:
In recent years, the possibility of a loop current ordered phase, in which spontaneous and spatially nonuniform electric currents circulate within a unit cell, has been proposed in a various materials. Despite growing interest, many aspects of the macroscopic physical consequences of loop current order remain unsolved.
In this talk, we show that the emergence of loop current order...

6. Diagnosing topological order: from Chern markers for integer Chern bands to helical entanglement spectroscopy in fractional topological insulators [Dr Gunnar Möller, University of Kent]

12/01/2026, 14:00

Topological phases are characterised by a robustness against perturbations, yet it is instructive to examine how sufficiently strong perturbations can ultimately destroy them. Here, we discuss two representative examples.

First, we study the breakdown of the quantised Hall conductance in the non-interacting Haldane model under disorder and in the presence of a trivial mass term. We find...

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