The amplification of the superconducting critical temperature T-c from the low temperature range in homogeneous 2D planes (T-c < 23 K) to the high temperature range (23 K < T-c < 150 K) in an artificial heterostructure of quantum stripes is calculated. The high T-c is obtained by tuning the chemical potential mu near the bottom of the nth subband (E(n)), at a ''shape resonance'', in a range mu-E(n) similar to HBAR omega(D), where HBAR omega(D) is the energy cutoff for the pairing interaction. The resonance for the gap Delta(n) at the nth ''shape resonance'' is studied for a free electron gas in the BCS approximation as a function of the stripe width L, and of the number of electrons rho per unit surface. An amplification factor 650 > Delta(3)/Delta(infinity) > 6 for coupling 0.1 < lambda < 0.3 is obtained at the third shape resonance raising the critical temperature in the high T-c range.

The Gap Amplification at a "Shape Resonance" in a Superlattice of Quantum Stripes: Mechanism for High Tc / A., Perali; Bianconi, Antonio; A., Lanzara; Saini, Naurang Lal. - In: SOLID STATE COMMUNICATIONS. - ISSN 0038-1098. - STAMPA. - 100:(1996), p. 181. [10.1016/0038-1098(96)00373-0]

The Gap Amplification at a "Shape Resonance" in a Superlattice of Quantum Stripes: Mechanism for High Tc

BIANCONI, Antonio;SAINI, Naurang Lal
1996

Abstract

The amplification of the superconducting critical temperature T-c from the low temperature range in homogeneous 2D planes (T-c < 23 K) to the high temperature range (23 K < T-c < 150 K) in an artificial heterostructure of quantum stripes is calculated. The high T-c is obtained by tuning the chemical potential mu near the bottom of the nth subband (E(n)), at a ''shape resonance'', in a range mu-E(n) similar to HBAR omega(D), where HBAR omega(D) is the energy cutoff for the pairing interaction. The resonance for the gap Delta(n) at the nth ''shape resonance'' is studied for a free electron gas in the BCS approximation as a function of the stripe width L, and of the number of electrons rho per unit surface. An amplification factor 650 > Delta(3)/Delta(infinity) > 6 for coupling 0.1 < lambda < 0.3 is obtained at the third shape resonance raising the critical temperature in the high T-c range.
1996
01 Pubblicazione su rivista::01a Articolo in rivista
The Gap Amplification at a "Shape Resonance" in a Superlattice of Quantum Stripes: Mechanism for High Tc / A., Perali; Bianconi, Antonio; A., Lanzara; Saini, Naurang Lal. - In: SOLID STATE COMMUNICATIONS. - ISSN 0038-1098. - STAMPA. - 100:(1996), p. 181. [10.1016/0038-1098(96)00373-0]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/133181
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