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물리 김범준·김기석 교수팀, 양자 컴퓨팅 혁신의 열쇠 ‘나선성 메커니즘’, 마침내 밝혀지다 | 포항공과대학교
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class="icon_item">확대</i></a><a href="#;" class="zoom_btn zoom_down" id="zoom_down"><i class="icon_item">축소</i></a></li> </ul> </div><!-- //share&print 버튼 --> </div><!-- //페이지 공통 컨덴츠 --> <article id="post-60043" class="post-60043 post type-post status-publish format-standard hentry category-uncategorized"> <!-- 싱글 페이지 시작 --><div class="entry-content"><div class="page_wrap borad-single"><div class="page_title"> <h2 class="depth1_title">연구성과</h2> </div> <!-- 싱글 보드 컨텐츠 --> <div class="b_single_box"><div class="h_single"><div class="single_title"><h3 class="txt_regular">물리 김범준·김기석 교수팀, 양자 컴퓨팅 혁신의 열쇠 ‘나선성 메커니즘’, 마침내 밝혀지다</h3></div> <div class="meta_info"> <div class="cont_l"> <span class="info1">2024-11-18</span> <span class="info2">129</span> </div> </div></div> <div class="desc_single"> <div class="disc_single_container"> <div class="single_cont"> <p style="text-align: center;"><strong>[김범준·김기석 교수팀, 칼코젠 화합물 나선성 전하 밀도파 메커니즘 세계 최초 규명]</strong></p> <p><img class="aligncenter size-full wp-image-60169" src="https://www.postech.ac.kr/wp-content/uploads/2024/11/김범준-교수팀_뷰페이지.jpg" srcset="https://www.postech.ac.kr/wp-content/uploads/2024/11/김범준-교수팀_뷰페이지.jpg 550w, https://www.postech.ac.kr/wp-content/uploads/2024/11/김범준-교수팀_뷰페이지-300x261.jpg 300w" sizes="(max-width: 550px) 100vw, 550px" />물리학과 김범준 교수, 통합과정 김광래·김현우·하승혁 씨 연구팀은 김기석 교수, 복진모 연구원 연구팀과의 공동 연구를 통해 전이금속 칼코겐화합물에서 ’나선성 전하 밀도파<b><sup class="sup_num" style="font-size: 10px!important; display: inline-block; vertical-align: super!important; color: #c61065!important;">*1</sup></b>(Chiral Charge Density Wave, CDW)‘ 현상을 관측하고, 그 메커니즘을 세계 최초로 규명했다. 이번 연구는 물리학계 권위 학술지 ‘네이처 피직스(Nature physics)‘ 온라인판에 최근 게재됐다.</p> <p>나선성(Chirality)은 물체가 자기 거울상과 대칭되지 않고 구별되는 현상이다. 이는 전자 등의 입자 배치와 상호작용에 영향을 미치며, 양자 컴퓨팅의 속도를 획기적으로 높일 수 있어 스마트폰과 컴퓨터, 자동차 등 다양한 분야에서 혁신을 이끌 것으로 기대된다. 그러나, 아원자<b><sup class="sup_num" style="font-size: 10px!important; display: inline-block; vertical-align: super!important; color: #c61065!important;">*2</sup></b> 수준부터 생명체에 이르기까지 자연계에서 널리 존재하는 나선성의 형성 원리는 아직 명확히 밝혀지지 않았다.</p> <p>이번 연구는 타이타늄(Ti)과 셀레늄(Se)으로 이루어진 1T-TiSe₂(원티-타이타늄 셀레늄 투)라는 전이금속 칼코겐화합물(TMDs<b><sup class="sup_num" style="font-size: 10px!important; display: inline-block; vertical-align: super!important; color: #c61065!important;">*3</sup></b>)에서 나타나는 ’전하 밀도파‘와 ’격자 변형‘의 상호작용을 규명하려는 시도에서 시작됐다. 이 두 현상은 전자의 움직임과 원자 진동, 그리고 구조 변화에 대한 중요한 정보를 제공한다.</p> <p>연구팀은 자체 개발한 라만 분광 장비와 미국 아르곤연구소와 함께 수행한 빛의 비탄성 산란 실험<b><sup class="sup_num" style="font-size: 10px!important; display: inline-block; vertical-align: super!important; color: #c61065!important;">*4</sup></b>을 통해 물질 내 원자들의 진동을 추적하고, 나선성 구조가 형성되는 과정을 세밀하게 분석했다. 연구에 따르면, 전자가 재배치되면서 전하 밀도파가 발생할 때 원자들은 새로운 위치로 이동하여 결정 구조가 변화하게 된다. 이 원자들의 움직임은 특정 형태의 진동이 고정되는 현상으로, 다양한 원자 진동을 관측함으로써 미세한 구조 변화를 포착할 수 있다.</p> <p>이 과정에서 연구팀은 기존에 알려진 것과 달리 원자 진동을 지배하는 대칭성과 전하 밀도의 대칭성이 근본적으로 다르다는 사실을 발견했다. 그동안 ’전하 밀도파‘와 ’격자 변형‘이 동일한 대칭성을 가진다고 알려졌지만, 실제로는 이 두 현상이 서로 영향을 주고받으면서도 각기 다른 대칭성을 따랐다. 그리고, 이 대칭성의 불일치를 해결하기 위한 원자들의 추가 진동으로 인해 구조적 변화가 일어나며, 그 결과 모든 대칭성이 깨져 ’나선성 구조‘가 형성됐다. 두 현상 간 대칭성의 차이가 나선성 구조 발현 메커니즘의 핵심이었던 것이다.</p> <p><img class="aligncenter size-full wp-image-60044" src="https://www.postech.ac.kr/wp-content/uploads/2024/11/국문_김범준-교수팀.jpg" srcset="https://www.postech.ac.kr/wp-content/uploads/2024/11/국문_김범준-교수팀.jpg 650w, https://www.postech.ac.kr/wp-content/uploads/2024/11/국문_김범준-교수팀-300x211.jpg 300w" sizes="(max-width: 650px) 100vw, 650px" /><br /> 연구를 이끈 김범준 교수는 “1976년 1T-TiSe₂의 결정 구조가 처음 보고된 이후, 이 물질에서 나선성이 발현된 최초의 실험적 증거를 찾았다”라며, “이번 연구는 향후 양자 물질 설계에 중요한 기반이 될 것”이라고 연구의 의의를 전했다.</p> <p>한편, 이번 연구는 기초과학연구원, 재단법인 삼성미래기술육성재단 삼성미래기술육성사업, 과학기술정보통신부 중견연구사업의 지원을 받아 수행됐다.</p> <p>DOI: <a title="사이트 바로가기" href="https://doi.org/10.1038/s41567-024-02668-w" target="_blank" rel="noopener">https://doi.org/10.1038/s41567-024-02668-w</a></p> <hr /> <p align="justify"><b>1. 전하 밀도파</b><br /> <span class="s1"> 전자가 결정 구조와는 다른 새로운 주기의 변형을 일으키며 발생하는 파동 형태의 전하 밀도를 말한다.</span></p> <p align="justify"><b>2. 아원자</b><br /> <span class="s1"> 원자보다 더 작은 입자로 소립자나 원자핵, 양성자, 전자 등이 있다.</span></p> <p align="justify"><b>3. 전이금속 칼코겐화합물(TMDs)</b><br /> <span class="s1"> 철(Fe), 니켈(Ni), 구리(Cu), 타이타늄(Ti) 등 주기율표에서 3주기 이상에 위치한 전이금속과 산소(O), 황(S), 셀레늄(Se), 텔루륨(Te) 등 주기율표 16족 칼코겐 원소가 결합한 화합물을 말한다.</span></p> <p align="justify"><b>4. 빛의 비탄성 산란 실험</b><br /> <span class="s1"> 비탄성 산란 실험이란, 빛을 물질에 쏘아 빛의 에너지 변화로부터 원자와 전자의 운동 방식을 파악하는 실험으로, 물질 내의 미세한 구조와 상호작용을 분석할 수 있다.</span></p> </div> </div> </div> </div> <!-- //싱글 보드 컨텐츠 --> <!-- 싱글 페이지 네비 --><div class="b_single_paging"><ul> <li class="prev"><a href="https://www.postech.ac.kr/%eb%ac%bc%eb%a6%ac%ec%9c%b5%ed%95%a9-%eb%b0%95%ea%b2%bd%eb%8d%95-%ea%b5%90%ec%88%98%ed%8c%80-%ec%96%91%ec%9e%90%eb%ac%bc%ec%a7%88%ec%9d%98-%ec%a0%84%ec%9e%90-%eb%b6%84%ed%8f%ac-%ea%b7%b9%ed%95%9c/?paged=1&k=&c=&cat=&event="><i class="">previous</i> <span class="txt">물리/융합 박경덕 교수팀, 양자물질의 전자 분포, 극한 나노 공간에서 자유자재로 제어한다</span></a></li> <li class="next"><a 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