Since 1999

The 14th KIAS-APCTP Workshop on Nanoscale and Mesoscopic Systems

"Spin Hall Effect"

June 09 (Fri) -- 10 (Sat), 2006
Korea Institute for Advanced Study (KIAS)

With invited speakers

Dr. Kwon Park (KIAS)
Prof. Seung-Hyun Chun (Sejong University)

Prof. Shun-Qing Shen (University of Hong Kong)

Organized by

Choi, Mahn-Soo (Korea U.)
Choi, Moo Young (KIAS, Seoul Nat'l U.)
Kim, Ju-Jin(Chonbuk Nat'l U.)
Kim, Jinhee (KRISS)
Lee, Hu-Jong (Postech)
Lee, Hyun-Woo (Postech)
Park, Kyoung Wan (U. of Seoul)
Sim, Heung-Sun (KAIST)
Yoo, Kyung-Hwa (Yonsei U.)
Yi, Hangmo (Soonngsil U.)

나노-중시계 연구모임 메일링 리스트

중시계 연구 모임에 관한 소식은 E-mail로 배포 됩니다. 배포목록에 자신이나 타인이 올려지기를 희망하시는 분은 나노-중시계 연구모임 메일링 리스트에 가셔서 가입하시기 바랍니다. E-mail 주소가 변경된 분들이나 메일을 더이상 원하지 않으시는 분들도 변경/탈퇴하실 수 있습니다.

Satellite Seminar

"Observation of spin current: theory and experiment"
by Shun-Qing Shen
at KIAS (Room 1423)
on Thu Jun 8, 2006 16:00

Abstract: Spin coherent transport of conduction electrons in semiconductor heterostructures is currently an emerging subject due to its possible application in a new generation of electronic devices. There have been considerable efforts to achieve spin polarized current or pure spin current in semiconductors. Optical injection of spin current is largely based on the fact that the spin polarized carriers in conduction band can be injected in semiconductors via absorption of the circularly or linearly polarized light. While there are successful ways to inject or generate spin current, its detection is still a subtle problem. Despite the optical methods which indicated spin accumulation due to the spin current, it is tempting to probe spin current by measuring its electric effects. In this talk, I will introduce the effect of electric transverse current driven by an optically injected spin current in a two-dimensional electron gas of InGaAs/InAlAs with structure inversion asymmetry. A linearly polarized light pumps electrons from valence to conduction bands, which induces a pure spin current with an in-plane polarization due to the spin orbit coupling. The scattering effect induced by this spin current in a crossbar shaped mesoscopic system is explored, which yields two measurable inward or outward electric transverse currents. I also report recent progress of experimental observation in The University of Hong Kong.

Introduction

The "Workshop on Nanoscale and Mesoscopics Systems" is a meeting to promote the information exchange, scientific discussions, and collaborations among scientists working on nanosctures or mesoscopics systems. Since it was first launched in January 1999, it has been held twice a year, each time inviting three or four experts in the field as lecturers. It is intended particularly for lectures rather than seminal talks as in usual conferences so that the partcipants can learn and discuss thoroughly the topics. The topics covered in previous workshops are available here or at the Homepage of the Quantum Transport and Superconductivity Lab. at Postech.

This time, we will discuss the spin Hall effect. Recently, the spin Hall effect in two-dimensional electron (hole) gas with the spin-orbit coupling has attracted remarkable interest. The interest has been intensified even further by the controversies about the finiteness of the spin Hall conductance and its concept itself. The scope of the workshop is to provide the basic introduction to the spin Hall effect and the elementary physical descriptions of it, to address the fundamental issues on the definition of the spin Hall conductance, to review the key theoretical and experimental developements, and to discuss the perspectives of the subject in the future.

"나노-중시계연구모임"은 mesoscopic systems이나 nanostructure systems 분야의 연구에 종사하는 사람들이 모여서 자신들의 연구 정보를 교환하고, 각자의 연구결과를 서로에게 알림으로써, 국내의 이 분야 연구를 보다 활성화하고 상호간에 협동연구와 친교를 증진하는 것을 목적으로 1999년 1월에 결성되었습니다. 이 모임은 일년에 두 번, 하루 이틀 정도의 일정으로 특정한 주제에 대해 국내 (경우에 따라서는 해외) 전문가들에 의한 일련의 강의를 듣는 것으로 진행됩니다. 따라서 일반적인 학술발표회보다는 훨씬 심도 있는 내용의 전달과 토의가 가능한 것이 특징입니다. 이전의 나노-중시계연구모임 강의 주제는 포항공대 양자전도/초전도 연구실 홈페이지의 "conference and workshop" 항목 또는 여기에 요약되어 있습니다.

이번 모임의 주제는 "스핀 홀 효과"입니다. 스핀 홀 효과는 최근 뜨거운 관심 속에 가장 활발한 연구활동을 보인 분야 중의 하나였으며, 이러한 관심은 스핀 홀 전도도가 과연 유한한 것인가에대한 논란과 스핀 홀 전도도의 개념자체에대한 논란으로 이어지면서 더욱 증가하게 되었습니다. 이번 모임에서는 스핀 홀 효과의 가장 핵심이 되는 현상이 무엇이며 기본적인 물리적 기술 방법은 어떤것이 있는지 알아보고, 최근의 이론적 실험적 주요 연구 성과를 살펴봄으로써, 앞으로 이 분야 연구 방향을 모색하고자 합니다.

Registration / 참가신청

On-line Registration Form
Dead line: Fri May 26, 2006 / 마감: 05월 26일 (금)
Please fill in the registration form. / 사전 준비가 원할하게 이루어질 수 있도록 꼭 온라인 참가신청서를 작성하여 주시기 바랍니다.
To see the registration list, please click here.
Registration is free of charge / 등록비는 없습니다.

Accommodation / 숙소

Accommodation is not provided. There are some Internet sites which provide hotel/model information. One example is HOTEL365 (http://www.hotel365.co.kr/) (Search with a keyword "제기동" or "종암동").
숙소는 제공되지 않습니다. 지방에서 참가하시는 분들은 가령 HOTEL365 (http://www.hotel365.co.kr/) 등에서 "제기동" 혹은 "종암동"을 검색하시면 가까운 호텔이나 모텔을 찾으실 수 있습니다.
You may also want to see the map around KIAS.
고등과학원 주변약도도 참고하시기 바랍니다.

Support for Students

지방 학생 참가자에게는 일정한 한계 내에서 숙박비를 지원해 드립니다.
교통비 지원에 대해서는 추후 공지해드리겠습니다.

Program

Registration
Fri Jun 09, 2006 11:50 -- 12:50
(Registration is free of charge.)
"Spin Hall Effect" (theory) [Lecture Note]
Prof. Shun-Qing Shen (University of Hong Kong)
Fri Jun 09, 2006 13:00--14:10
1. Introductory Spintronics
2. Spin-orbit coupling in semiconductors: electric control of quantum spin
3. Spin current and spin Hall effect
"Spin Transverse Force" (theory) [Lecture Note]
Prof. Shun-Qing Shen (University of Hong Kong)
Fri Jun 09, 2006 14:20--15:30
1. Spin transverse force: a pure quantum mechanical quantity
2. Applications of spin transverse force
  - Solution of single spin in an electric field
  - Spin force balance in a steady state
  - Spin force and anomalous Hall effect
  - Spin force and spin Hall effect
Photo session
"Experiments on Anomalsou Hall Effect" (experiment) [Lecture Note]
Prof. Seung-Hyun Chun (Sejong University)
Fri Jun 09, 2006 15:45--16:55
1. Various aspects of Hall effect
2. Intrinsic anomalous Hall effect from real-space Berry phase
3. Intrinsic anomalous Hall effect from momentum-space Berry phase
"Experiments on Spin Hall Effect" (experiment) [Lecture Note]
Prof. Seung-Hyun Chun (Sejong University)
Fri Jun 09, 2006 17:05--18:15
1. Proposals to measure spin Hall effect
2. Recent experimental results and interpretations
"Optical Femtosecond Magnetic Switching" (experiment)
Prof. T.H.M. Rasing (University of Nijmegen)
Fri Jun 09, 2006 18:30--19:15
Banquet
Place to be announced later.
Fri Jun 09, 2006 19:30--21:00
(Banquet is free of charge.)
"Berry Phase and the Hall Effect" (theory) [Lecture note not available]
Prof. Kwon Park (KIAS)
Sat Jun 10, 2006 09:30 -- 10:45
1. Hall effect: a semi-classical view
2. Berry phase
3. Hall effect without magnetic field: anomalous Hall effect
4. Anomalous Hall effect v.s. spin Hall effect
"Spin and the Quantum Hall Effect" (theory) [Lecture Note]
Prof. Kwon Park (KIAS)
Sat Jun 10, 2006 11:05 -- 12:20
1. Quantum Hall effect
2. Skyrmion and Berry phase
3. Other spin effects in the quantum Hall systems

Other Information

How to get to KIAS: Please see KIAS Homepage
모임(강의) 장소 찾아오기: 고등과학원 홈페이지 참조.
The information about the workshop is announced via E-mail. If you want to subscribe yourself (or somebody else) to the mailing list, please send your (or his/her) name and E-mail address to Prof. Hu-Jong Lee at hjlee@postech.ac.kr. Or, you can directly subscribe to the mailing list at the Mesoscopoics Mailing List site.