Disentangling bulk and surface Rashba effects in ferroelectric α-GeTe

被引：83

作者：

Krempasky, J. ^{[1
]}

Volfova, H. ^{[2
]}

Muff, S. ^{[1
,3
]}

Pilet, N. ^{[1
]}

Landolt, G. ^{[1
,4
]}

Radovic, M. ^{[1
,5
]}

Shi, M. ^{[1
]}

Kriegner, D. ^{[6
]}

Holy, V. ^{[6
]}

Braun, J. ^{[2
]}

Ebert, H. ^{[2
]}

Bisti, F. ^{[1
]}

Rogalev, V. A. ^{[1
]}

Strocov, V. N. ^{[1
]}

Springholz, G. ^{[7
]}

Minar, J. ^{[2
,8
]}

Dil, J. H. ^{[1
,3
]}

机构：

[1] Paul Scherrer Inst, Swiss Light Source, CH-5232 Villigen, Switzerland

[2] Ludwig Maximillian Univ, Dept Chem, D-81377 Munich, Germany

[3] Ecole Polytech Fed Lausanne, Inst Phys, CH-1015 Lausanne, Switzerland

[4] Univ Zurich, Inst Phys, Winterthurerstr 190, CH-8057 Zurich, Switzerland

[5] Paul Scherrer Inst, SwissFEL, CH-5232 Villigen, Switzerland

[6] Charles Univ Prague, Dept Condensed Matter Phys, Ke Karlovu 5, Prague 12116 2, Czech Republic

[7] Johannes Kepler Univ Linz, Inst Halbleiter & Festkorperphys, A-4040 Linz, Austria

[8] Univ West Bohemia, New Technol Res Ctr, Plzen, Czech Republic

来源：

PHYSICAL REVIEW B | 2016年 / 94卷 / 20期

基金：

奥地利科学基金会; 瑞士国家科学基金会;

关键词：

Ferroelectricity - Ferroelectric materials - Photoemission - Electronic structure - Germanium compounds;

D O I：

10.1103/PhysRevB.94.205111

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Macroscopic ferroelectric order in alpha-GeTe with its noncentrosymmetric lattice structure leads to a giant Rashba spin splitting in the bulk bands due to strong spin-orbit interaction. Direct measurements of the bulk band structure using soft x-ray angle-resolved photoemission (ARPES) reveals the three-dimensional electronic structure with spindle torus shape. By combining high-resolution and spin-resolved ARPES as well as photoemission calculations, the bulk electronic structure is disentangled from the two-dimensional surface electronic structure by means of surface capping, which quenches the complex surface electronic structure. This unravels the bulk Rashba-split states in the ferroelectric Rashba a-GeTe(111) semiconductor exhibiting a giant spin splitting with Rashba parameter alpha(R) around 4.2 eV angstrom, the highest of so-far known materials.

引用

页数：7

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