3,137 research outputs found
Non-Linear Impact of Growth Opportunity and Firm Size on the Capital Structure
One of the focuses on capital structure studies is to identify economic forces influencing corporate capital structure. We investigated the non-linear effects of the firm-specific factors to the leverage of the firm of the US-listed firms. In the partial-adjusted model, growth opportunity and the size of the firm had non-linear effects on the leverage of the firm. Growth opportunity showed quadratic effects on leverage with a negative linear term but a positive quadratic term. It meant if the growth opportunity of a firm reached a certain level, fund providers can relatively detect it and subsequently causes a decrease in asymmetric information. This detection of ample growth opportunity will increase the accessibility of external funding. Firm size also exhibits quadratic effects on leverage with a positive linear term but a negative quadratic term. In other words, if the firm size as a proxy of various omitted variables was imminent, the financial market has been applied the diversification discount that will decrease the accessibility of external funding.JEL Classification: G32, D92DOI: https://doi.org/10.26905/jkdp.v22i4.240
A new non-Fermi liquid fixed point
We study a new exchange interaction in which the conduction electrons with
pseudo spin interact with the impurity spin . Due to the
overscreening of the impurity spin by higher conduction electron spin, a new
non-trivial intermediate coupling strength fixed point is realized. Using the
numerical renormalization group (NRG), we show that the low-energy spectra are
described by a non-Fermi liquid excitation spectrum. A conformal field theory
analysis is compared with NRG results and excellent agreement is obtained.
Using the double fusion rule to generate the operator spectrum with the
conformal theory, we find that the specific heat coefficient and magnetic
susceptibility will diverge as , that the scaling dimension of an
applied magnetic field is , and that exchange anisotropy is always
relevant. We discuss the possible relevance of our work to two-level system
Kondo materials and dilute cerium alloys, and we point out a paradox in
understanding the Bethe-Ansatz solutions to the multichannel Kondo model.Comment: Revised. 20 page
Thermopower of Aharonov-Bohm Interferometer with a Quantum Dot
We report on the thermopower of an Aharonov-Bohm interferometer (AB) with a
quantum dot in the Kondo limit. The thermopower is anomalously enhanced due to
the Kondo effect as in heavy fermion systems. In contrast to the bulk systems,
the sign of the thermopower can be changed by adjusting the energy level scheme
or the particle-hole asymmetry of a dot with the gate voltage. Further the
magnitude and even the sign of the thermopower in the AB ring can be changed at
will with varying either magnetic fields or the gate voltages.Comment: 4 pages, 3 figures, accepted for publication in Physical Review
Letter
Transport through a quantum wire with a side quantum-dot array
A noninteracting quantum-dot array side-coupled to a quantum wire is studied.
Transport through the quantum wire is investigated by using a noninteracting
Anderson tunneling Hamiltonian. The conductance at zero temperature develops an
oscillating band with resonances and antiresonances due to constructive and
destructive interference in the ballistic channel, respectively. Moreover, we
have found an odd-even parity in the system, whose conductance vanishes for an
odd number of quantum dots while becomes for an even number. We
established an explicit relation between this odd-even parity, and the
positions of the resonances and antiresonances of the conductivity with the
spectrum of the isolated QD arrayComment: 5 pages, 4 figures, submitted to PR
Even-odd parity effects in conductance and shot noise of metal-atomic wire-metal(superconducting) junctions
In this paper, we study the conductance and shot noise in transport through a
multi-site system in a two terminal configuration. The dependence of the
transport on the number of atoms in the atomic wire is investigated using a
tight-binding Hamiltonian and the nonequilibrium Green's function method. In
addition to reproducing the even-odd behavior in the transmission probability
at the Fermi energy or the linear response conductance in the normal-atomic
wire-normal metallic(NAN) junctions, we find the following: (i) The shot noise
is larger in the even-numbered atomic wire than in the odd-numbered wire. (ii)
The Andreev conductance displays the same even-odd parity effects in the
normal-atomic wire-superconducting(NAS) junctions. In general, the conductance
is higher in the odd-numbered atomic wire than in the even-numbered wire. When
the number of sites () is odd and the atomic wire is mirror symmetric with
respect to the center of the atomic wire, the conductance does not depend on
the details of the hopping matrices in the atomic wire, but is solely
determined by the coupling strength to the two leads. When is even, the
conductance is sensitive to the values of the hopping matrices.Comment: 12 pages, 9 figure
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