logo

korean english

게시판

Home > 게시판 > 세미나

고체이론연구실에서 포항공대의 Dheeraj Kumar Singh 박사님을 초청하여 아래와 같이 세미나를 개최합니다.

학과 구성원 여러분의 많은 참석을 부탁드립니다.

 

○ 일시: 2018 11 13() 오전 11:00 ~ 13:00

○ 장소: Creative Learning Room, 7th Floor in Samsung Library

○ 연사: Dr. Dheeraj Kumar Singh (POSTECH)

Title: Hunds coupling driven role of  $d_{3z^2-r^2}$ in stabilizing the hole-doped antiferromagnetic state in cuprates

Abstract:  One of the long-standing theoretical issues in high-$T_c$ cuprates is the instability of the

hole-doped antiferromagnetic state when considered with the one-orbital model, which has been

established through various studies. Cuprates, however, do exhibit a hole-doped antiferromagnetic

state though in a narrow doping regime. We show that such a robust state can be realized within a

recently proposed minimal two-orbital model incorporating Cu $d_{3z^2-r^2}$ orbital. The

stabilization is a direct result of the Hunds coupling enforcing the d_{x^2-y^2} orbital electronic density 

~ 1 accompanied with a significant reduction of $d_x^2-y^2$ spectral density at the Fermi level. This, in turn,

leads to the suppression of intraband fluctuations detrimental to the antiferromagnetic

phase. The hole doping involves removal of  mainly d_{3z^2-r^2} electrons that are localized

considerably. In other words, the $d_{3z^2-r^2}$ shifts up above the Hubbard split lower

d_{x^2-y^2} band. Thus, in this new scenario, holes can also occupy $d_{3z^2-r^2}$, in addition to the

oxygen $p$ orbital.

 

 

번호 제목 날짜 조회 수
공지 <12/8(Thu.) 11:00am>노벨상 소개 강연 - 2016년 노벨 물리학상: 위상 응집 물리의 탄생 2016.11.28 1089716
136 <2/1> The Surface Science of Adsorption on Crystalline Ferroelectric Polymer Surfaces 2010.01.25 114910
135 <9/11> Complex networks in technology, biology and sociology 2009.09.04 115215
134 <Oct.10(Wed.) 4:30 PM> Standard Model of Cosmology and Beyond 2018.09.21 115981
133 <5/21> Magnetism and Superconductivity 2014.05.14 115983
132 <10/15> How can population pyramids be used to explore the past? 2010.10.14 116040
131 <11/5(Thu.)> Higher Spin Cooper Pairs 2020.10.27 116231
130 <5/27(수) 오후4:30분>Controlling phases in epitaxial transition metal oxide thin films 2015.05.21 116642
129 <5/28> The hunt for high energy neutrinos with IceCube - more evidence for their astrophysical origin 2014.05.22 117058
128 <Oct. 28(Wed.) 4:30 PM> Anomalous diffusion of single-molecules in living cells: at the interface of biology and statistical physics 2015.10.19 117111
127 <11/16> Study of carrier transport and charging effects in organic devices 2011.11.10 117580
126 <7/28> NQR/NMR study on a single crystal of LiFeAs 2010.07.20 117673
125 <11/13> Computer-Aided Engineering for Nucleic Acid Nanostructures 2013.11.07 117828
124 <5/1> Entanglement and topological order in 1D and 2D systems 2013.04.18 118032
123 <4/18> Action-angle variables for the near-horizon extreme black hole particle dynamics 2012.04.17 118588
122 <2/16>Development of Micromegas detectors for neutron physics 2010.02.01 118753
121 <10/15> Electric control of magnetic nanostructures via spin torque 2010.10.08 118957
120 <11/26> Effective Holographic Theories for Condensed Matter Systems 2010.11.23 119328
119 <4/13> Introduction to Quantum Information Processing 2007.04.11 119960
118 <5/14> Search for exotic materials: strongly correlated electron system 2010.05.10 120248
117 <12/4> The "Physics" of Climate Change 2009.12.02 120946