Theory of the effective Seebeck coefficient for photoexcited 2D materials: the case of graphene

Abstract

Thermoelectric phenomena in photoexcited graphene have been the topic of several theoretical and experimental studies because of their potential usefulness in optoelectronic applications. However, available theoretical descriptions of the thermoelectric effect in terms of the Seebeck coefficient do not take into account the role of the photoexcited electron density. In this work, we adopt the concept of effective Seebeck coefficient [G.D. Mahan, J. Appl. Phys. 87, 7326 (2000)] and extend it to the case of a photoexcited two-dimensional (2D) electron gas. We calculate the effective Seebeck coefficient for photoexcited graphene, we compare it to the commonly used "phenomenological" Seebeck coefficient, and we show how it depends on the photoexcited electron density and temperature. Our results are necessary inputs for any quantitative microscopic theory of thermoelectric effects in graphene and related 2D materials.

arXiv comment8 pages, 6 figures

References in corpus (25)

• Electronic transport in two dimensional graphene
• Carrier transport in 2D graphene layers
• Electron-Electron Interactions in Graphene: Current Status and Perspectives
• Hot Carrier-Assisted Intrinsic Photoresponse in Graphene
• Acoustic phonon scattering limited carrier mobility in 2D extrinsic graphene
• Sensitive Room-Temperature Terahertz Detection via Photothermoelectric Effect in Graphene
• Graphene-Based Integrated Photonics For Next-Generation Datacom And Telecom
• First-principles calculations of charge carrier mobility and conductivity in bulk semiconductors and two-dimensional materials
• Electronic Cooling in Graphene
• Generation of photovoltage in graphene on a femtosecond time scale through efficient carrier heating
• Screening induced temperature dependent transport in 2D graphene
• Carrier Recombination and Generation Rates for Intravalley and Intervalley Phonon Scattering in Graphene
• Non-equilibrium dynamics of photo-excited electrons in graphene: collinear scattering, Auger processes, and the impact of screening
• Theory of thermopower in 2D graphene
• The ultrafast dynamics and conductivity of photoexcited graphene at different Fermi energies
• Hot-carrier photocurrent effects at graphene-metal interfaces
• The Nature of Thermopower in Bipolar Semiconductors
• Hydrodynamic theory of transport in doped graphene
• Transport coefficients of graphene: Interplay of impurity scattering, Coulomb interaction, and optical phonons
• Ultra-fast calorimetric measurements of the electronic heat capacity of graphene
• Direct Mapping of Local Seebeck Coefficient in 2D Material Nanostructures via Scanning Thermal Gate Microscopy
• A note on the electrochemical nature of the thermoelectric power
• Prediction of thermomagnetic and thermoelectric properties for novel materials and systems
• Negative dynamic Drude conductivity in pumped graphene
• Heat capacity of nonequilibrium electron-hole plasma in graphene layers and graphene~bilayers

Cited by in corpus (4)

• Terahertz photodetection in scalable single-layer-graphene and hexagonal boron nitride heterostructures
• Plasmon Fizeau drag in 3D Dirac and Weyl semimetals
• Current-induced enhancement of photo-response in graphene THz radiation detectors
• Slow interband recombination promotes an anomalous thermoelectric response of the $p-n$ junctions