scholarly journals Exact result on the Mott transition in a two-dimensional model of strongly correlated electrons

1994 ◽  
Vol 49 (19) ◽  
pp. 14047-14049 ◽  
Author(s):  
Frédéric Mila
Keyword(s):  
Strongly Correlated Electrons ◽  
Exact Result ◽  
Mott Transition ◽  
Correlated Electrons ◽  
Strongly Correlated ◽  
Two Dimensional ◽  
Dimensional Model ◽  
Two Dimensional Model

Optical conductivity for the two-dimensional systems of strongly correlated electrons

2001 ◽  
Vol 364-365 ◽  
pp. 197-201
Author(s):  
Jae-Hyeon Eom ◽  
Sung-Sik Lee ◽  
Ki-Seok Kim ◽  
Sung-Ho Suck Salk
Keyword(s):  
Optical Conductivity ◽  
Strongly Correlated Electrons ◽  
Correlated Electrons ◽  
Strongly Correlated ◽  
Two Dimensional

scholarly journals Phase Separation in the Two-Dimensional Systems of Strongly Correlated Electrons: The Role of Spin Singlet Pairs on Hole Pairing Contribution to Hole-Rich Phase

2005 ◽  
Vol 277-279 ◽  
pp. 1011-1016
Author(s):  
Sung Sik Lee ◽  
Sul Ah Ahn ◽  
Sung Ho Suck Salk
Keyword(s):  
Phase Separation ◽  
Strongly Correlated Electrons ◽  
Real Space ◽  
Correlated Electrons ◽  
Hole Density ◽  
Strongly Correlated ◽  
Two Dimensional ◽  
Rich Phase ◽  
Spin Singlet

By paying attention to the hole-doped two-dimensional systems of antiferromagnetically (strongly) correlated electrons, we discuss the cause of hole-rich phase formation in association with phase separation. We show that the phase diagram obtained from Maxwell's construction in the plane of temperature vs. hole density is consistent with one derived from the evaluation of hole-rich and electron-rich phases in real space. We observe that the formation of a hole-rich phase is attributed to the aggregation of hole pairs induced by spin singlet pairs present in the pseudogap phase, and that the direct involvement of correlations between hole pairs is not essential for phase separation.

Commitment to pro- versus counter-attitudinal behavior and the dynamics of social representations

2002 ◽  
Vol 61 (1) ◽  
pp. 34-44 ◽  
Author(s):  
Eric Tafani ◽  
Lionel Souchet
Keyword(s):  
Higher Education ◽  
Social Representations ◽  
Cognitive Restructuring ◽  
Social Representation ◽  
Two Dimensional ◽  
Dimensional Model ◽  
Social Actions ◽  
The Social ◽  
Two Dimensional Model ◽  
Students Attitudes

This research uses the counter-attitudinal essay paradigm ( Janis & King, 1954 ) to test the effects of social actions on social representations. Thus, students wrote either a pro- or a counter-attitudinal essay on Higher Education. Three forms of counter-attitudinal essays were manipulated countering respectively a) students’ attitudes towards higher education; b) peripheral beliefs or c) central beliefs associated with this representation object. After writing the essay, students expressed their attitudes towards higher education and evaluated different beliefs associated with it. The structural status of these beliefs was also assessed by a “calling into question” test ( Flament, 1994a ). Results show that behavior challenging either an attitude or peripheral beliefs induces a rationalization process, giving rise to minor modifications of the representational field. These modifications are only on the social evaluative dimension of the social representation. On the other hand, when the behavior challenges central beliefs, the same rationalization process induces a cognitive restructuring of the representational field, i.e., a structural change in the representation. These results and their implications for the experimental study of representational dynamics are discussed with regard to the two-dimensional model of social representations ( Moliner, 1994 ) and rationalization theory ( Beauvois & Joule, 1996 ).

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