TY - JOUR
T1 - Impurity induced insulator-to-metal transitions in half-filled Mott insulators
AU - Yokoyama, Hisatoshi
AU - Sato, Ryo
AU - Kobayashi, Kenji
N1 - Funding Information:
The authors thank Tsutomu Watanabe for useful discussions. This study is supported in part by Grants-in-Aid from the Ministry of Education, Culture, Sports, Science and Technology, Japan.
Publisher Copyright:
© 2019 Published under licence by IOP Publishing Ltd.
PY - 2019/10/15
Y1 - 2019/10/15
N2 - In view of cuprate superconductors, effects of point-type impurity potential (V) on half-filled antiferromagnetic and paramagnetic states are studied for a strongly correlated square-lattice Hubbard model (U/t = 12) with a diagonal transfer (t′), using a variational Monte Carlo method. In the trial states, we introduce a Rice-Brinkman-type one-body projector for V, which enables us to treat the whole range of V (- ∞ < V/t < ∞) with small statistical errors. Filling-control-type Mott (insulator-to-metal) transitions are found to occur at U (∼ ±U). In the metallic states V U, charge carriers are holes (electrons) in the case of attractive (repulsive) potential. The mechanism of the transitions is intuitively understood.
AB - In view of cuprate superconductors, effects of point-type impurity potential (V) on half-filled antiferromagnetic and paramagnetic states are studied for a strongly correlated square-lattice Hubbard model (U/t = 12) with a diagonal transfer (t′), using a variational Monte Carlo method. In the trial states, we introduce a Rice-Brinkman-type one-body projector for V, which enables us to treat the whole range of V (- ∞ < V/t < ∞) with small statistical errors. Filling-control-type Mott (insulator-to-metal) transitions are found to occur at U (∼ ±U). In the metallic states V U, charge carriers are holes (electrons) in the case of attractive (repulsive) potential. The mechanism of the transitions is intuitively understood.
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U2 - 10.1088/1742-6596/1293/1/012024
DO - 10.1088/1742-6596/1293/1/012024
M3 - Conference article
AN - SCOPUS:85075922167
SN - 1742-6588
VL - 1293
JO - Journal of Physics: Conference Series
JF - Journal of Physics: Conference Series
IS - 1
M1 - 012024
T2 - 31st International Symposium on Superconductivity, ISS 2018
Y2 - 12 December 2018 through 14 December 2018
ER -