A new impurity solver for multi-orbital systems: adaptive truncation of the Hilbert space
2016.04.04 11:45
장소 | E6-2. 1st fl. #1322 |
---|---|
일시 | Apr. 5 (Tue.), 4PM |
연사 | Dr. Ara Go, Columbia University |
"A new impurity solver for multi-orbital systems: adaptive truncation of the Hilbert space"
Apr. 5 (Tue.), 4PM, E6-2. 1st fl. #1322
Dr. Ara Go, Columbia University
The exact diagonalization (ED) has many attractive advantages as an impurity solver for the dynamical mean-field theory (DMFT). It solves the impurity Hamiltonians with any types of interaction in contrast to the quantum Monte Carlo, which suffers from the severe sign problem in low symmetry situation. However, the ED approximates the continuous bath to a finite quantum mechanical problem to reduce the system size, so that the total number of orbitals is less than 14. This is insufficient, to treat most multi-orbital systems via the DMFT. To overcome this limit, we first adapt the configuration interaction (CI) as an impurity solver. We show the computed optical conductivity through this method is in excellent agreement with the experiment at gap edge. We have further developed adaptive truncations of the Hilbert space, which can handle much larger impurity Hamiltonians without loosing the advantages of the ED. We benchmark the one-dimensional Hubbard model and show that this impurity solver can obtain sufficiently accurate Green functions of impurity Hamiltonian with 24 electronic orbitals. The solvable system size in this method is larger than twice of the ED limit, and this capability enlarges the DMFT applications to many unexplored problems. I also discuss the possible applications, focussing on the multi-orbital systems with low symmetry.
Contact: MyungJoon Han, Physics Dept., (mj.han@kaist.ac.kr)
댓글 0
번호 | 일시 | 장소 | 연사 | 제목 |
---|---|---|---|---|
165 | October 24 (Wed.), 10:30 AM | E6-1, Lecture Room 1501(1F) | Prof. Kerry J. Vahala |
Photonic integration of next-generation clocks and Hertz-absolute-accuarcy optical frequenncy synthesizers
![]() |
164 | Mar. 25(Fri.) 11:00 | E6-1 #1323 | Prof. Ara Go (Department of Physics, Chonnam National University) |
응집물리 세미나 안내(연사: Prof. Ara Go,Chonnam National University)
![]() |
163 | 2014/12/22, 2PM | E6, Rm1319 | Prof. Changbong Hyeon (KIAS) |
Dynamics of molecular motors: Power stroke vs Brownian ratchet
![]() |
162 | 2009/02/23-05/04 | E6, 1501 | 안종현교수(성균관대) 외 |
Physics Colloquium : 2009 Spring
![]() |
161 | 2009/09/07-11/30 | E6, 1501 | 이주영박사(KIAS) 외 |
Physics Colloquium : 2009 Fall
![]() |
160 | 2009/10/21, 4PM | E6, 1501 | 최석봉교수(서울대) | Interdimensional Universality of Dynamic Interfaces |
159 | 2010/02/08-05/03 | E6, 1501 | 최인수교수(서울대) 외 |
Physics Ciolloquium : 2010 Spring
![]() |
158 | 2010/09/06-12/06 | E6, 1501 | 조호진기자(조선일보) 외 |
Physics Colloquium : 2010 Fall
![]() |
157 | 2010/02/14-05/09 | E6, 1501 | 황철주(주성엔지니어링 사장) 외 |
Physics Colloquium - 2011 Spring
![]() |
156 | 2011/05/16, 4PM | E6, 1501 | 서민교교수(KAIST) | Photonics with surface plasmon polaritons |
155 | 2011/09/03-12/06 | E6, 1501 | 김용균교수(한양대) 외 |
Physics Colloquium : 2011 Fall
![]() |
154 | 2012/02/13-05/14 | E6, 1501 | Kenji Ohmori (Photo-Molecular Science, IMS) | Physics Colloquium : 2012 Spring |
153 | 2012/04/02, 4PM | E6, 1501 | Yong Hee Jeong | A new route to ferroelectricity in magnetic spinels: a case of Co2MnO4 |
152 | 2013/03/11-06/10 | E6, 1501 | 강명수교수(KAIST) 외 | Physics Colloquium : 2013 Spring |
151 | 2013/09/09-12/09 | E6, 1501 | 박혁규교수(부산대) 외 | Physics Colloquium : 2013 Fall |
150 | 2014/03/10-06/09 | E6, 1501 | 신용일교수(서울대) |
Physics Colloquium : 2014 Spring
![]() |
149 | 2015/09/15-12/08 | E6, 1501 | 박제근 교수(서울대 물리학과) 외12명 |
Physics Colloquium : 2014 Fall
![]() |
148 | 2015/03/09-06/08 | E6, 1501 | 최현용교수(연세대) 외12명 |
Physics Colloquium : 2015 Spring
![]() |
147 | 2015/09/07-12/01 | E6, 1501 | 문은국 교수(KAIST) 외 |
Physics Colloquium : 2015 Fall
![]() |
146 | 2016/03/07-06/13 | E6, 1501 | Prof. David Helfman(KAIST) 외 |
Physics Colloquium : 2016 Spring
![]() |