تقرير
Strongly enhanced superconductivity in coupled t-J segments
| العنوان: | Strongly enhanced superconductivity in coupled t-J segments |
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| المؤلفون: | Reja, Sahinur, Brink, Jeroen van den, Nishimoto, Satoshi |
| المصدر: | Phys. Rev. Lett. 116, 067002 (2016) |
| سنة النشر: | 2015 |
| المجموعة: | Condensed Matter |
| مصطلحات موضوعية: | Condensed Matter - Superconductivity |
| الوصف: | The $t\!\!-\!\!J$ Hamiltonian is one of the cornerstones in the theoretical study of strongly correlated copper-oxide based materials. Using the density matrix renormalization group method we calculate the phase diagram of the one-dimensional (1D) $t\!\!-\!\!J$ chain in the presence of a periodic hopping modulation, as a prototype of coupled-segment models. While in the uniform 1D $t\!\!-\!\!J$ model near half-filling superconducting (SC) state dominates only at unphysically large values of the exchange coupling constant $J/t>3$, we show that a small hopping and exchange modulation very strongly reduces the critical coupling to be as low as $J/t\sim1/3$ -- well within the physical regime. The phase diagram as a function of the electron filling also exhibits metallic, insulating line phases and regions of phase separation. We suggest that a SC state is easily stabilized if $t\!\!-\!\!J$ segments creating local spin-singlet pairing are coupled to each other -- another example is ladder system. Comment: 4 pages + 4 figures; 5 pages + 6 figures |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1103/PhysRevLett.116.067002 |
| URL الوصول: | http://arxiv.org/abs/1509.04117 |
| رقم الأكسشن: | edsarx.1509.04117 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1103/PhysRevLett.116.067002 |
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