TY - JOUR

T1 - Electron-induced nuclear magnetic ordering in n -type semiconductors

AU - Vladimirova, M.

AU - Scalbert, D.

AU - Kuznetsova, M. S.

AU - Kavokin, K. V.

N1 - Publisher Copyright: © 2021 American Physical Society. Copyright: Copyright 2021 Elsevier B.V., All rights reserved.

PY - 2021/5/21

Y1 - 2021/5/21

N2 - Nuclear magnetism in n-doped semiconductors with a positive hyperfine constant is revisited. Two kinds of nuclear magnetic ordering can be induced by resident electrons in a deeply cooled nuclear spin system. At positive nuclear spin temperature below a critical value, randomly oriented nuclear spin polarons similar to that predicted by Merkulov [Phys. Solid State 40, 930 (1998)PSOSED1063-783410.1134/1.1130450] should emerge. These polarons are oriented randomly, and within each polaron, nuclear and electron spins are aligned antiferromagnetically. At negative nuclear spin temperature below a critical value, we predict another type of magnetic ordering - a dynamically induced nuclear ferromagnet. This is a long-range ferromagnetically ordered state involving both electrons and nuclei. It can form if electron spin relaxation is dominated by the hyperfine coupling, rather than by the spin-orbit interaction. Application of the theory to the n-doped GaAs suggests that ferromagnetic order may be reached at experimentally achievable nuclear spin temperature ΘN≈-0.5μK and lattice temperature TL≈5K.

AB - Nuclear magnetism in n-doped semiconductors with a positive hyperfine constant is revisited. Two kinds of nuclear magnetic ordering can be induced by resident electrons in a deeply cooled nuclear spin system. At positive nuclear spin temperature below a critical value, randomly oriented nuclear spin polarons similar to that predicted by Merkulov [Phys. Solid State 40, 930 (1998)PSOSED1063-783410.1134/1.1130450] should emerge. These polarons are oriented randomly, and within each polaron, nuclear and electron spins are aligned antiferromagnetically. At negative nuclear spin temperature below a critical value, we predict another type of magnetic ordering - a dynamically induced nuclear ferromagnet. This is a long-range ferromagnetically ordered state involving both electrons and nuclei. It can form if electron spin relaxation is dominated by the hyperfine coupling, rather than by the spin-orbit interaction. Application of the theory to the n-doped GaAs suggests that ferromagnetic order may be reached at experimentally achievable nuclear spin temperature ΘN≈-0.5μK and lattice temperature TL≈5K.

UR - http://www.scopus.com/inward/record.url?scp=85107061234&partnerID=8YFLogxK

U2 - 10.1103/PhysRevB.103.205207

DO - 10.1103/PhysRevB.103.205207

M3 - Article

AN - SCOPUS:85107061234

VL - 103

JO - Physical Review B-Condensed Matter

JF - Physical Review B-Condensed Matter

SN - 1098-0121

IS - 20

M1 - 205207

ER -