Interaction effects at crossings of spin-polarized one-dimensional subbands

被引：66

作者：

Graham, AC ^{[1
]}

Thomas, KJ ^{[1
]}

Pepper, M ^{[1
]}

Cooper, NR ^{[1
]}

Simmons, MY ^{[1
]}

Ritchie, DA ^{[1
]}

机构：

[1] Cavendish Lab, Cambridge CB3 OHE, England

来源：

PHYSICAL REVIEW LETTERS | 2003年 / 91卷 / 13期

关键词：

D O I：

10.1103/PhysRevLett.91.136404

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We report conductance measurements of ballistic one-dimensional (1D) wires defined in GaAs/AlGaAs heterostructures in an in-plane magnetic field, B. When the Zeeman energy is equal to the 1D subband energy spacing, the spin-split subband Nup arrow intersects (N+1)down arrow, where N is the index of the spin-degenerate 1D subband. At the crossing of N=1up arrow and N=2down arrow subbands, there is a spontaneous splitting giving rise to an additional conductance structure evolving from the 1.5(2e(2)/h) plateau. With further increase in B, the structure develops into a plateau and lowers to 2e(2)/h. With increasing temperature and magnetic field the structure shows characteristics of the 0.7 structure. Our results suggest that at low densities a spontaneous spin splitting occurs whenever two 1D subbands of opposite spins cross.

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页数：4

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