http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
- 中文 을 입력하시려면 zhongwen을 입력하시고 space를누르시면됩니다.
- 北京 을 입력하시려면 beijing을 입력하시고 space를 누르시면 됩니다.
RISS 인기검색어
- 검색키워드
- 저자 : 엄재곤 (검색결과 4 건)
- 무료
- 기관 내 무료
- 유료
-
Phase Transitions in Positionally Disordered Josephson Junction Arrays in a Magnetic Field
엄재곤,Beom Jun Kim,이성익 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.48 No.II
We numerically investigate phase transitions of two-dimensional (2D) Josephson junction arrays (JJA) with positional disorder in a transverse magnetic field. The current-voltage characteristics in strong disorder are computed. It is revealed that there is a phase transition of a non-Kosterlitz- Thouless type at a finite temperature, consistent with a recent experiment on the positionally disordered JJA as well as previous numerical studies of a 2D gauge glass model.?퇓W
-
Quantum Phase Transition and Finite-Size Scaling of the One-Dimensional Ising Model
엄재곤,김범준,이성익 한국물리학회 2007 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.50 No.1I
We study the quantum phase transition in the one-dimensional Ising model at zero temperature. As the strength g of the transverse .eld is changed, the system undergoes a quantum phase tran- sition from an ordered to a disordered phase, characterized by spontaneous magnetization in the z-direction. We apply the standard technique of .nite-size scaling in statistical mechanics to detect the nature of the quantum phase transition in the system.2Fkci%2
-
양자점에서의 평형과 비평형 동역학을 위한 건드림 없는 그린함수 방법
김성진,황선용,엄재곤,이주연 한국물리학회 2009 새물리 Vol.59 No.1
We implement a nonperturbative method to examine the equilibrium and the nonequilibrium dynamics of strongly correlated electrons in quantum dots coupled to reservoirs. Using an ansatz for the ground state of the system, we obtain the Green's function from the equation of motion built up with effective operators. In equilibrium, we obtain the spectral density of the system that reproduces the result obtained by using the Lehmann method. Also, extending the method to incorporate two reservoirs having different chemical potential, we find that the equilibrium results are well reproduced, but the density of states (DOS) at a higher Fermi level is modified, requiring further examination to fix the inconsistency. 본 연구에서는 전자 저장고와 연결된 양자점의 평형과 비평형 동역학에 대해 조사하기 위한 건드림 없는 방법을 제안하고자 한다. 이는 계의 바닥상태함수를 고려하고, 주요한 동적 연산자들로 표현된 운동방정식을 얻음으로써 그린함수를 구하는 방법이다. 이 방법을 평형상태에 적용한 결과, 그린함수로부터 구한 상태 밀도함수는 Lehmann 방법에 의해 얻은 결과와 정확히 일치함을 확인하였다. 또한, 비평형상태를 고려하기 위하여, 저장고가 양쪽에 연결된 양자점에서의 그린함수를 구하였다. 우선, 양쪽의 저장고의 에너지 준위가 같은 평형상태에서 결과를 확인하고, 비평형상태로 확장에의 문제점을 제시하고자 한다.
-
Carnot Efficiency and Zero-Entropy Production Rate Do Not Guarantee Reversibility of a Process
Jae Sung Lee,이상훈,엄재곤,박형규 한국물리학회 2019 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.75 No.12
A thermodynamic process at a zero-entropy production (EP) rate has been regarded as a reversible process. A process achieving the Carnot efficiency is also considered a reversible process. Therefore, the condition, `Carnot efficiency at zero-EP rate' can be regarded as a strong condition for a reversible process. Here, however, we show that the detailed balance can be broken for a zero-EP rate process and even for a process achieving the Carnot efficiency at a zero-EP rate in an example of a quantum-dot model. This clearly demonstrates that `Carnot efficiency at zero-EP rate' or just `zero-EP rate' is not a sufficient condition for a reversible process.
연관 검색어 추천
이 검색어로 많이 본 자료
활용도 높은 자료
