visual
visual

세미나

  • HOME
  • >
  • 소식
  • >
  • 세미나

Search for dark matter axion with Rydberg atoms

2021.03.19 17:37

admin 조회 수:1995

장소 Online Seminar (Zoom) 
일시 Mar25(Thur), 04:00PM 
연사 Prof. Atsushi Tokiyasu (Tohoku Univ.) 

Topic: Search for dark matter axion with Rydberg atoms

 

Speaker: Prof. Atsushi Tokiyasu


Date: March 25, 2021 (Thursday)
Time: 4:00 PM

 

Venue: Online Seminar (Zoom Teleconference System)
 
https://kaist.zoom.us/j/6108068959?pwd=TXV2OGlWdVRtcGhmNXVTRWlla2pHQT09

Meeting ID: 610 806 8959

Passcode: 131015
     

Abstract:     

 

Axion is a hypothetical particle, originally proposed to solve the Strong CP problem in the QCD theory. Axion is believed to be generated in the early universe, and it is known to be one of the candidates of cosmic dark matter.

Many search experiments were performed, but the existence of axion has not been established yet.

From the recent observation on the cosmic microwave and the theoretical calculation, it is suggested that the
axion has a mass of O(100) micro-eV. We are aiming to search for axion in this mass region (New-CARRACK
project).
In the New-CARRACK project, we are planning to search for axion by using a single photon detection method.
Single photon detection is free from the standard quantum limit, and allows us to search for axion with a wide
range of mass without degrading its detection sensitivity.
If the mass of axion is O(100) micro-eV, the converted photon with strong magnetic field have the frequency of O
(10) GHz. It is difficult to detect this photon with a micro-wave cavity, and we will use a Rydberg atom, which is an excited atom that have electrons with high principal quantum number (n~100).
Rydberg atom is known to be sensitive to micro-wave photons. By changing the excited level with the laser
system, we can control the sensitive frequency. In addition, we can search for axion in the wide mass range by
using direct photo-ionization processes.
 
We are now constructing a detector system which consists of superconducting magnet, a dilution refrigerator and high-precision laser system to excite a Rydberg atom.We have also found a new method to improve S/N of axion search which utilize
a cooled and bunched beam of Rydberg atoms.
 

 

In this seminar, the recent results of axion search experiments are reviewed. The overview of New-CARRACK project are
introduced, and the preparation status will be reported.
Poster_Tokiyasu (Revised).jpg

 

introduced, and the preparation status will be reported.

 

번호 일시 장소 연사 제목
182 2015/09/07-12/01  E6, 1501  문은국 교수(KAIST) 외  Physics Colloquium : 2015 Fall file
181 2009/02/23-05/04  E6, 1501  안종현교수(성균관대) 외  Physics Colloquium : 2009 Spring file
180 2009/09/07-11/30  E6, 1501  이주영박사(KIAS) 외  Physics Colloquium : 2009 Fall file
179 2009/10/21, 4PM  E6, 1501  최석봉교수(서울대)  Interdimensional Universality of Dynamic Interfaces
178 2010/02/08-05/03  E6, 1501  최인수교수(서울대) 외  Physics Ciolloquium : 2010 Spring file
177 2011/09/03-12/06  E6, 1501  김용균교수(한양대) 외  Physics Colloquium : 2011 Fall file
176 2010/09/06-12/06  E6, 1501  조호진기자(조선일보) 외  Physics Colloquium : 2010 Fall file
175 2010/02/14-05/09  E6, 1501  황철주(주성엔지니어링 사장) 외  Physics Colloquium - 2011 Spring file
174 2011/05/16, 4PM  E6, 1501  서민교교수(KAIST)  Photonics with surface plasmon polaritons
173 2012/02/13-05/14  E6, 1501  Kenji Ohmori (Photo-Molecular Science, IMS)  Physics Colloquium : 2012 Spring
172 2012/04/02, 4PM  E6, 1501  Yong Hee Jeong  A new route to ferroelectricity in magnetic spinels: a case of Co2MnO4
171 2013/03/11-06/10  E6, 1501  강명수교수(KAIST) 외  Physics Colloquium : 2013 Spring
170 2013/09/09-12/09  E6, 1501  박혁규교수(부산대) 외  Physics Colloquium : 2013 Fall
169 2014/03/10-06/09  E6, 1501  신용일교수(서울대)  Physics Colloquium : 2014 Spring file
168 2015/09/15-12/08  E6, 1501  박제근 교수(서울대 물리학과) 외12명  Physics Colloquium : 2014 Fall file
167 2015/03/09-06/08  E6, 1501  최현용교수(연세대) 외12명  Physics Colloquium : 2015 Spring file
166 5. 30(월), 16:00  E6, #1501  공수현교수 (고려대학교 물리학과)  Light manipulation using 2D layered semiconductors
165 5. 23(월),16:00  E6, #1501  김준성교수 (postech 물리학과)  Novel electronic transport in topological van der Waals magnets
164 5.16(월),16:00  E6, #1501  조규붕교수 (HKUST)  Design synthetic topological matter with atoms and lights
163 5. 9(월),16:00  E6, #1501  김창영교수 (서울대)  Searching for new electronic properties in correlated material flatland