Breaking the phonon bottleneck in semiconductor nanocrystals via multiphonon emission induced by intrinsic nonadiabatic interactions

被引：231

作者：

Schaller, RD ^{[1
]}

Pietryga, JM ^{[1
]}

Goupalov, SV ^{[1
]}

Petruska, MA ^{[1
]}

Ivanov, SA ^{[1
]}

Klimov, VI ^{[1
]}

机构：

[1] Los Alamos Natl Lab, Div Chem, Los Alamos, NM 87545 USA

来源：

PHYSICAL REVIEW LETTERS | 2005年 / 95卷 / 19期

关键词：

D O I：

10.1103/PhysRevLett.95.196401

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We observe ultrafast 1P-to-1S intraband relaxation in PbSe and CdSe nanocrystals (NCs) that have distinct energy spectra. While ultrafast dynamics in CdSe NCs has typically been interpreted in terms of electron-hole energy transfer, this mechanism is not active in PbSe NCs because of sparse densities of states in the conduction and valence bands. Our observations of temperature activation and confinement-enhanced relaxation in PbSe NCs can be explained by efficient multiphonon emission triggered by nonadiabatic electron-phonon interactions and are indicative of large, size-dependent, intraband Huang-Rhys parameters.

引用

页数：4

共 29 条

[1] Semiconductor clusters, nanocrystals, and quantum dots [J].

Alivisatos, AP .

SCIENCE, 1996, 271 (5251) :933-937

[2] INTRINSIC MECHANISM FOR THE POOR LUMINESCENCE PROPERTIES OF QUANTUM-BOX SYSTEMS [J].

BENISTY, H ;

SOTOMAYORTORRES, CM ;

WEISBUCH, C .

PHYSICAL REVIEW B, 1991, 44 (19) :10945-10948

[3] PHONON-SCATTERING AND ENERGY RELAXATION IN 2-DIMENSIONAL, ONE-DIMENSIONAL, AND ZERO-DIMENSIONAL ELECTRON GASES [J].

BOCKELMANN, U ;

BASTARD, G .

PHYSICAL REVIEW B, 1990, 42 (14) :8947-8951

[4] The relaxation pathways of CdSe nanoparticles monitored with femtosecond time-resolution from the visible to the IR: Assignment of the transient features by carrier quenching [J].

Burda, C ;

Link, S ;

Mohamed, M ;

El-Sayed, M .

JOURNAL OF PHYSICAL CHEMISTRY B, 2001, 105 (49) :12286-12292

[5]

EFROS AL, 1995, SOLID STATE COMMUN, V93, P281, DOI 10.1016/0038-1098(94)00780-2

[6] Intraband relaxation in CdSe quantum dots [J].

Guyot-Sionnest, P ;

Shim, M ;

Matranga, C ;

Hines, M .

PHYSICAL REVIEW B, 1999, 60 (04) :R2181-R2184

[7] Structure of excited-state transitions of individual semiconductor nanocrystals probed by photoluminescence excitation spectroscopy [J].

Htoon, H ;

Cox, PJ ;

Klimov, VI .

PHYSICAL REVIEW LETTERS, 2004, 93 (18) :187402-1

[8] BIEXCITONS IN SEMICONDUCTOR QUANTUM DOTS [J].

HU, YZ ;

KOCH, SW ;

LINDBERG, M ;

PEYGHAMBARIAN, N ;

POLLOCK, EL ;

ABRAHAM, FF .

PHYSICAL REVIEW LETTERS, 1990, 64 (15) :1805-1807

[9] ELECTRON RELAXATION IN A QUANTUM DOT - SIGNIFICANCE OF MULTIPHONON PROCESSES [J].

INOSHITA, T ;

SAKAKI, H .

PHYSICAL REVIEW B, 1992, 46 (11) :7260-7263

[10] Electronic structure and optical properties of PbS and PbSe quantum dots [J].

Kang, I ;

Wise, FW .

JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS, 1997, 14 (07) :1632-1646

← 1 2 3 →