BEC series


Due to the Coronavirus problems in Japan, it is our real regret to announce that we cancel the BE/BC2020F meeting and make it virtual only within the registered participants as of Feb.21, 2020.
(decided on Feb.24, 2020)

International workshop
"Variety and universality of bulk-edge correspondence in topological phases:
From solid state physics to transdisciplinary concepts"
[ BE/BC2020F (Bulk-Edge/Boundary Correspondence)]
Feb. 28-29, 2020


Description of the workshop

Triggered by recent studies on topological insulators, the concept of topology has become one of the major building blocks of modern condensed matter physics. Looking back to history, the importance of this concept was realized through efforts to understand unexpected experimental results in phenomena such as the quantum Hall effect, vortices in superconductivity and so on. On the other hand, it is interesting to note that, in the realm of mathematics, the corresponding framework such as cohomology, characteristic class, K-theory were already developed during the early 20th century, way before the development in physics, but now plays an essential role in explaining experiments. However, the situation is still not satisfactory. This is because, with only few exceptions, it is difficult to directly “measure the topology” in topological states. The exception lies at the boundary. The real surprise is that one can observe the topology through edge states as low energy boundary modes living near the system edges as well as local states near impurities. These edge states/boundary states are physical observables. Enormous success of the ARPES (angular resolved photoemission spectroscopy) experiments are the key achievements in the recent big bang in the topological business. The surface sensibility of the ARPES enables us to directly see the topology as a number of edge channels. Indeed, topology and edge states are directly related. This is the bulk-edge correspondence. Topology is not a mere concept but a real observable! With this breakthrough, we can recast new understanding to many of localized modes in quite different areas such as cold atoms, photonics, solid states and even classical mechanics. Some of them are traditional local states/modes and might be well known. But they could be well understood by this new way of thinking. THINK DIFFERENT topologically through the bulk-edge correspondence. The workshop is for people in different fields to get together and discuss topological phases in solids, atoms, light and more. Let's look at physics from boundaries and impurities, which are geometrical perturbation for the bulk. Everyone interested in topological phases/materials/lights are welcome. Target systems can be topological materials (topological insulators, (anomalous) quantum (spin/valley) Hall states, graphene, silicene, anisotropic superconductors, Majorana/Andreev bound states), photonics crystals, light, topological mechanics and more. Needless to say, people working in topological condensed matter (theories and experiments) without any edge states are welcome, of course.
We are planning to have a mathematician as a speaker in order to make an even larger hop, between physics and pure mathematics.

This workshop is a continuation of a series of the workshops

BEC2015 in Tokyo, Sep. 27-29 (2015)
BEC2016 in Kyoto, Sep. 27-30 (2016) as a YITP workshop of the Yukawa Institute for theoretical physics (Kyoto University) t
BEC2018-Jan in Tsukuba, Sep. 27-29 (2018)
BEC2018X in Tokyo, Dec. 9-13 (2018)
BEC2019-NTTI2019 in Hiroshima, July 14-19 (2019) together with New Trends in Topological Insulators
that we enjoyed a lot. Then we further try to get together again and discuss new developments. Also hope to get interdisciplinary interaction among various areas from physics to math by the keyword "BEC" (Bulk-Edge-Correspondence) and BE/BC(Bulk-Edge/Boundary-Correspondence).

February 28-29 (2020)

Feb.27: Welcome
Feb.28-29 : Scientific program
筑波大学 東京キャンパス文京校舎
〒112-0012 東京都文京区大塚3-29-1


We have booked a block of rooms for invited speakers mainly from abroad at Tokyo Green Hotel . It is just a one stop away from the Myogadani Station (Conference place) of the subway (Marunouchi/Red Line).

For registration, please send following information to the email address below. We ask to register even if you do not plan to make a presentation.

Participation to the workshop is free.

Subject: registration Bulk-Edge Correspondence 2020F(BE/BC2020F)

First , Family Name:
Poster Presentation : Yes/No,
Need support: Yes/No
Short abstract (a few lines):

Hideo Aoki (AIST/Univ. of Tokyo)
Takahiro Fukui (Ibaraki Univ.)
Mikio Furuta (Univl. of Tokyo)
* Yasuhiro Hatsugai (Univ. of Tsukuba)
Satoshi Iwamoto (Univ. of Tokyo)
Tohru Kawarabayashi (Toho Univ.)
Akio Kimura (Hiroshima Univ.)
Yoshiro Takahashi (Kyoto Univ.)
(alphabetical, * chair)

Local organizers:
Ken-ichiro Imura (Hiroshima Univ.)
Toshikaze Kariyado (NIMS)
Shuta Nakajima (Kyoto Univ.)
Tsuneya Yoshida (Univ. Tsukuba)
Tomonari Mizoguchi (Univ. Tsukuba)

Invited speakers
Akio Kimura (Hiroshima Univ.)
Ching Hua Lee (National Univ. of Singapore)
Hideo Aoki (AIST/Univ. of Tokyo)
Junkyu Yang (Univ. of Washington)
Ken-ichiro Imura (Hiroshima Univ.)
Kyogo Kawaguchi (RIKEN)
Mario Novak (Univ. Zagreb)
Mikio Furuta (Univl. of Tokyo)
Mikito Koshino (Osaka Univ.)
Nobuyuki Takei (Kyoto Univ.)
Pierre Delplace (CNRS, ENS de Lyon)
Ryo Shimano (Univ. of Tokyo)
Satoshi Iwamoto (Univ. of Tokyo)
Sota Kitamura (Univ. of Tokyo)
Takahiro Fukui (Ibaraki Univ.)
Tohru Kawarabayashi (Toho Univ.)
Tomohiro Amemiya (Tokyo Inst. Tech.)
Tsuneya Yoshida (Univ. of Tsukuba)
Yohei Fuji(Univ. of Tokyo)
Yoshihito Kuno (Kyoto Univ.)
Yutaka Akagi(Univ. of Tokyo)
Xiao Hu (NIMS)
(As of Feb. 5, 2020.)
Scientific PROGRAM as of Feb15, 2020
Virtual workshop (NEW)

Full program with link is here.

Files are protected by the site's password and the pdf files as well. Contact organizers for further information at

The last update is on March 10, 2020.

Participants (virtual)
Registered participants:
P. Delplace
R. Shimano
T. Amemiya
J. Yang
X. Hu
K. Kawaguchi
Y. Akagi
Y. Fuji
S. Kitamura
C. H. Lee
N. Takei
Y. Kuno
M. Koshino
M. Novak
H. Aoki
T. Fukui
M. Furuta
S. Iwamoto
T. Kawarabayashi
A. Kimura
T. Yoshida
T. Mizoguchi
Y. Takahashi
Y. Hatsugai
R. Ghadimi
K. Kawabata
M. Arai
H. Kondo
T. Osada 
G. Najima
K. Kudo
H. Araki
H. Wakao
T. Isobe
M. Tomoda
K. Tsuruta
K. Okuno
K. Mochizuki
H. Kurihara
H. Takeda
H. Kagami
Y. Otaki
K. Asaga
Y. Soeda
K. Toyoda
T. Suzuki
K. Ishii
N. Ishida
Y. Ota
Y.-C. Jiang
K. Shiraishi
X.-X. Wang
H. Huang
C. Geng
(56 as of Feb.14)
Social events
To be fixed later.
This workshop is supported by KAKENHI from Japan society for the promotion of science (JSPS): "Variety and universality of bulk-edge correspondence in topological phases: From solid state physics to transdisciplinary concepts", Grant-in-Aid for Scientific Research (S) Project No.17H06138.

Also partly supported by
Tsukuba Research Center for Energy Materials Science (TREMS)