Ballistic charge-carrier kinetics and phonon drag in semiconducting point contacts

Bogachek, É. N.; Kulik, I. O.; Shkorbatov, A. G.

doi:10.1088/0953-8984/3/45/010

Cited by 9 publications

(13 citation statements)

References 16 publications

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“…This causes an asymmetrical heat generation in PC electrodes, as observed experimentally [4,5]. Moreover, theoretical analysis [6] shows that specific features of the phonon density of states are shown also in the dependence…”

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confidence: 62%

Calorimetric Tunneling Spectroscopy as a Perspective Tool for Derivation of Energy-spectroscopic Information in Electrically Conductive Solids

Baťko

Baťková

2004

Czech J Phys

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We discuss basic principles of a novel experimental technique, calorimetric tunneling spectroscopy (CTS), based on precise measurements of the heat generated due to electron tunneling in vacuum barrier tunneling junctions (VBTJs). We argue that CTS represents an alternative/complementary experimental method to the classical electron tunneling spectroscopy capable to yield equivalent physical information. : 73.40.Gk, 73.90.+f Careful measurements of the current-voltage (I-V ) characteristics of tunneling junctions (TJs) can be used for the derivation of energy-spectroscopic information of solids [1]. Many types of TJs, among them VBTJs (Fig. 1a) and TJs with insulating barrier (Fig. 1b), were used for the determination of electronic densities of states (DOS) or inelastic excitation thresholds from measured voltage dependence of dI/dV or d 2 I/dV 2 , respectively [1]. As well, measured d 2 I/dV 2 spectra of small metal constrictions (Fig. 1c) by means of point contact (PC) spectroscopy can contain structures which well correlate with phonon spectra of studied metals and can be related to the Eliashberg coupling function g(ω) = α 2 F (ω) [2]. PACSUnfortunately, PC spectroscopy works well only in systems in which the dimension d of the contact is smaller than the mean free path l of electrons (d < l). This presents serious limitation for a more wide utilization of the PC spectroscopy in the modern solid state physics, where systems with very short mean free path are frequently studied (e.g. heavy fermions or valence fluctuating systems). This limitation can be overcome if PCs operate in the tunnel regime [3]. As shown in [3], PC spectra in which metal electrodes are separated by thin insulating barrier (e.g. as depicted in Fig. 1b) with not too low barrier transmission probability still yield an information about the electron-phonon interaction (EPI), and moreover, in contrast to PCs in the ballistic regime, they do not require satisfaction of inequality d < l [3].If the voltage is applied across a PC with large Knudsen ratio K = l/d, then the electric field is confined to regions of dimension d of the contact [4]. Carriers * ) Presented at 12

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confidence: 62%

Calorimetric Tunneling Spectroscopy as a Perspective Tool for Derivation of Energy-spectroscopic Information in Electrically Conductive Solids

Baťko

Baťková

2004

Czech J Phys

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“…The existence of electrons with different temperatures in the system prevents the establishment of thermal equilibrium. The thermal transport through the point contact may be described in the entropy current formalism [11] as modified in [12] for the Landauer scheme [13]. The electronic contributions to the entropy and heat flows which are dominant in conductors are taken into consideration, and photon assisted transport is observed in QPC with an enhanced current density where the photon energy ishω.…”

Section: Theoretical Treatmentmentioning

confidence: 99%

Electro-Thermal Transport in Quantum Point Contact Nanodevice

Aly

Hwangbo

2009

Int J Thermophys

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The Peltier effect was discovered several decades ago. The Peltier effect has been combined with modern low-dimensional quantum system materials, e.g., the quantum point contact (QPC), to open up a new research field. The Peltier coefficient and thermal transport in a QPC, under the influence of photon-assisted and different temperatures are investigated. Numerical calculations of the Peltier coefficient have been performed at different applied voltages, amplitudes, and temperatures. The obtained results are consistent with experimental results in the literature.

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“…without scattering, and dissipate gained energy generating non-equilibrium quasiparticles only after passing the contact [2,3]. This asymmetry can be even a source of information about electron-phonon interaction [3,4]. Observations of dissipation asymmetries in TJs at high bias [5] and studies of self-heating due to electron tunneling in the Coulomb-blockade electrometer [6], as well as investigations of electronic refrigeration in the normal-metal -insulator -superconductor (NIS) TJ [7] show that the process of charge tunneling is frequently associated with generation of thermal gradients.…”

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confidence: 99%

Calorimetric tunneling study of heat generation in metal-vacuum-metal tunnel junctions

Baťko

Baťková

2005

Eur. Phys. J. Appl. Phys.

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We have proposed novel calorimetric tunneling (CT) experiment allowing exact determination of heat generation (or heat sinking) in individual tunnel junction (TJ) electrodes which opens new possibilities in the field of design and development of experimental techniques for science and technology. Using such experiment we have studied the process of heat generation in normalmetal electrodes of the vacuum-barrier tunnel junction (VBTJ). The results show there exists dependence of the mutual redistribution of the heat on applied bias voltage and the direction of tunnel current, although the total heat generated in tunnel process is equal to Joule heat, as expected. Moreover, presented study indicates generated heat represents the energy of non-equilibrium quasiparticles coming from inelastic electron processes accompanying the process of elastic tunneling.

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Ballistic charge-carrier kinetics and phonon drag in semiconducting point contacts

Cited by 9 publications

References 16 publications

Calorimetric Tunneling Spectroscopy as a Perspective Tool for Derivation of Energy-spectroscopic Information in Electrically Conductive Solids

Calorimetric Tunneling Spectroscopy as a Perspective Tool for Derivation of Energy-spectroscopic Information in Electrically Conductive Solids

Electro-Thermal Transport in Quantum Point Contact Nanodevice

Calorimetric tunneling study of heat generation in metal-vacuum-metal tunnel junctions

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