Large phonon-drag enhancement induced by narrow quantum confinement at the LaAlO3/SrTiO3 interface

被引：7

作者：

Pallecchi, I. ^{[1
,2
]}

Telesio, F. ^{[1
,2
]}

Marre, D. ^{[1
,2
]}

Li, D. ^{[3
]}

Gariglio, S. ^{[3
]}

Triscone, J. -M. ^{[3
]}

Filippetti, A. ^{[4
]}

机构：

[1] CNR SPIN UOS Genova, Via Dodecaneso 33, I-16146 Genoa, Italy

[2] Dipartimento Fis, Via Dodecaneso 33, I-16146 Genoa, Italy

[3] Univ Geneva, DQMP, 24 Quai Ernest Ansermet, CH-1211 Geneva 4, Switzerland

[4] CNR IOM UOS Cagliari, SP Monserrato Sestu Km 0,700, I-09042 Monserrato, Ca, Italy

来源：

PHYSICAL REVIEW B | 2016年 / 93卷 / 19期

基金：

欧洲研究理事会; 瑞士国家科学基金会;

关键词：

THERMOELECTRIC SEEBECK COEFFICIENT; 2-DIMENSIONAL ELECTRON-GAS; OXIDE INTERFACES; WELL STRUCTURES; 3D PHONONS; MERIT; THERMOPOWER; FIGURE; SUPERLATTICES; TEMPERATURE;

D O I：

10.1103/PhysRevB.93.195309

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The thermoelectric power of the two-dimensional electron system (2DES) at the LaAlO3/SrTiO3 interface is explored below room temperature, in comparison with that of Nb-doped SrTiO3 single crystals. For the interface, we find a region below T = 50 K where thermopower is dominated by phonon drag, whose amplitude is hugely amplified with respect to the corresponding bulk value, reaching values similar to mV/K and above. The phonon-drag enhancement at the interface is traced back to the tight carrier confinement of the 2DES, and represents a sharp signature of strong electron-acoustic phonon coupling at the interface.

引用

页数：8

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