Publications (15)
Experimental determination of Rashba spin-orbit coupling in wurtzite -GaN:Si
W. Stefanowicz, R. Adhikari, T. Andrearczyk +5
Millikelvin magnetotransport studies are carried out on heavily -doped wurtzite GaN:Si films grown on semi-insulating GaN:Mn buffer layers by metal-organic vapor phase epitaxy.…
Relation between exciton splittings, magnetic circular dichroism, and magnetization in wurtzite (Ga,Fe)N
J. -G. Rousset, J. Papierska, W. Pacuski +12
The question of the correlation between magnetization, band splittings, and magnetic circular dichroism (MCD) in the fundamental gap region of dilute magnetic semiconductors is exa…
Element specific characterization of heterogeneous magnetism in (Ga,Fe)N films
I. A. Kowalik, A. Persson, M. Ã. Niño +5
We employ x-ray spectroscopy to characterize the distribution and magnetism of particular alloy constituents in (Ga,Fe)N films grown by metal organic vapor phase epitaxy. Furthermo…
Low temperature and high magnetic field performance of a commercial piezo-actuator probed laser interferometry
R. Adhikari, K. Doesinger, P. Linder +2
The advances in the fields of scanning probe microscopy, scanning tunneling spectroscopy, point contact spectroscopy and point contact Andreev reflection spectroscopy to study the…
Positive magnetoresistance and chiral anomaly in exfoliated type-II Weyl semimetal -WTe
R. Adhikari, S. Adhikari, B. Faina +5
Layered van der Waals semimetallic -WTe, exhibiting intriguing properties which include non-saturating extreme positive magnetoresistance (MR) and tunable chira…
All-nitride and In-free AlGaN:Mn/GaN distributed Bragg reflectors for the near-infrared
G. Capuzzo, D. Kysylychyn, R. Adhikari +4
Since the technological breakthrough prompted by the inception of light emitting diodes based on III-nitrides, these material systems have emerged as strategic semiconductors not o…
The Fe-Mg interplay and the effect of deposition mode in (Ga,Fe)N doped with Mg
A. Navarro-Quezada, N. Gonzalez Szwacki, W. Stefanowicz +9
The effect of Mg codoping and its deposition mode on the Fe distribution in (Ga,Fe)N layers grown by metalorganic vapor phase epitaxy is investigated. Both homogeneously- and digit…
Upper bound for the s-d exchange integral in n-(Ga,Mn)N:Si from magnetotransport studies
R. Adhikari, W. Stefanowicz, B. Faina +3
A series of recent magnetooptical studies pointed to contradicting values of the s-d exchange energy N0α in Mn-doped GaAs and GaN as well as in Fe-doped GaN. Here, a strong sensit…
Origin of low-temperature magnetic ordering in Ga1-xMnxN
M. Sawicki, T. Devillers, S. GaÅÈ©ski +9
By employing highly sensitive millikelvin SQUID magnetometry, the magnitude of the Curie temperature as a function of the Mn concentration x is determined for thoroughly characteri…
Effects of s,p - d and s - p exchange interactions probed by exciton magnetospectroscopy in (Ga,Mn)N
J. Suffczynski, A. Grois, W. Pacuski +6
Near band-gap photoluminescence and reflectivity in magnetic field are employed to determine the exchange-induced splitting of free exciton states in paramagnetic wurtzite Ga1-xMnx…
Magnetooptical properties of (Ga,Fe)N layers
J. Papierska, J. -G. Rousset, W. Pacuski +13
Magnetooptical properties of (Ga,Mn)N layers containing various concentrations of Fe-rich nanocrystals embedded in paramagnetic (Ga,Fe)N layers are reported. Previous studies of su…
Ferromagnetic phase transition in topological crystalline insulator thin films: interplay of anomalous Hall angle and magnetic anisotropy
R. Adhikari, V. V. Volobuev, B. Faina +2
In magnetic topological phases of matter, the quantum anomalous Hall (QAH) effect is an emergent phenomenon driven by ferromagnetic doping, magnetic proximity effects and strain en…
Experimental probing of exchange interactions between localized spins in the dilute magnetic insulator (Ga,Mn)N
A. Bonanni, M. Sawicki, T. Devillers +16
The sign, magnitude, and range of the exchange couplings between pairs of Mn ions is determined for (Ga,Mn)N and (Ga,Mn)N:Si with x < 3%. The samples have been grown by metalorgani…
Magnetotransport in phase-separated (Ga,Fe)N with '-GaFeN nanocrystals
A. Navarro-Quezada, M. Aiglinger, B. Faina +6
The magnetotransport in phase-separated (Ga,Fe)N containing '-GaFeN (0\,\,y\,1) nanocrystals (NCs) is studied in the temperature range between 2\,K and 300\,K…
Embedded magnetic phases in (Ga,Fe)N: the key role of growth temperature
A. Navarro-Quezada, W. Stefanowicz, Tian Li +9
The local chemistry, structure, and magnetism of (Ga,Fe)N nanocomposites grown by metal organic vapor phase epitaxy is studied by high resolution synchrotron x-ray diffraction and…