Interband absorption in quantum wires. I. Zero-magnetic-field case

1992 ◽  
Vol 45 (4) ◽  
pp. 1688-1699 ◽  
Author(s):  
U. Bockelmann ◽  
G. Bastard
Keyword(s):  
Magnetic Field ◽  
Quantum Wires ◽  
Zero Magnetic Field ◽  
Interband Absorption ◽  
Field Case

Interband absorption in quantum wires. II. Nonzero-magnetic-field case

1992 ◽  
Vol 45 (4) ◽  
pp. 1700-1704 ◽  
Author(s):  
U. Bockelmann ◽  
G. Bastard
Keyword(s):  
Magnetic Field ◽  
Quantum Wires ◽  
Interband Absorption ◽  
Field Case

Spin splitting of one-dimensional subbands in high quality quantum wires at zero magnetic field

2000 ◽  
Vol 62 (23) ◽  
pp. 15842-15850 ◽  
Author(s):  
K. S. Pyshkin ◽  
C. J. B. Ford ◽  
R. H. Harrell ◽  
M. Pepper ◽  
E. H. Linfield ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Quantum Wires ◽  
Spin Splitting ◽  
Zero Magnetic Field ◽  
High Quality ◽  
One Dimensional

scholarly journals Spin depolarization in quantum wires polarized spontaneously in zero magnetic field

2004 ◽  
Vol 70 (15) ◽  
Author(s):  
N. T. Bagraev ◽  
I. A. Shelykh ◽  
V. K. Ivanov ◽  
L. E. Klyachkin
Keyword(s):  
Magnetic Field ◽  
Quantum Wires ◽  
Zero Magnetic Field ◽  
Spin Depolarization

scholarly journals Many-body Spin Interactions in Semiconductor Quantum Wires

2000 ◽  
Vol 53 (4) ◽  
pp. 543 ◽  
Author(s):  
D. J. Reilly ◽  
L. N. Pfeiffer ◽  
G. R. Facer ◽  
K. W. West ◽  
A. S. Dzurak ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Applied Magnetic Field ◽  
Quantum Wires ◽  
Zero Magnetic Field ◽  
Point Contacts ◽  
Many Body ◽  
Temperature Dependent ◽  
Modulation Doping ◽  
Dominant Mechanism ◽  
Spin Interactions

Zero length quantum wires (or point contacts) exhibit unexplained conductance structure close to 0.7 � 2e 2 /h in the absence of an applied magnetic field. We have studied the density- and temperature-dependent conductance of ultra-low-disorder GaAs/AlGaAs quantum wires with nominal lengths l=0 and 2�m, fabricated from structures free of the disorder associated with modulation doping. In a direct comparision we observe structure near 0.7 � 2e 2 /h for l = 0, whereas thel = 2�m wires show structure evolving with increasing electron density to 0.5 � 2e 2 /h in zero magnetic field, the value expected for an ideal spin-split sub-band. Our results suggest the dominant mechanism through which electrons interact can be strongly affected by the length of the 1D region.

scholarly journals Experimental signatures of nodeless multiband superconductivity in a $$\hbox {2H-Pd}_{0.08} \hbox {TaSe}_2$$ single crystal

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Chanhee Kim ◽  
Dilip Bhoi ◽  
Yeahan Sur ◽  
Byung-Gu Jeon ◽  
Dirk Wulferding ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Single Crystal ◽  
Zero Magnetic Field ◽  
Anisotropy Ratio ◽  
Strong Temperature Dependence ◽  
Critical Fields ◽  
Band Theory ◽  
Plane Field ◽  
Low Field ◽  
Out Of Plane

AbstractIn order to understand the superconducting gap nature of a $$\hbox {2H-Pd}_{0.08} \hbox {TaSe}_2$$ 2H-Pd 0.08 TaSe 2 single crystal with $$T_{c} = 3.13 \text { K}$$ T c = 3.13 K , in-plane thermal conductivity $$\kappa $$ κ , in-plane London penetration depth $$\lambda _{\text {L}}$$ λ L , and the upper critical fields $$H_{c2}$$ H c 2 have been investigated. At zero magnetic field, it is found that no residual linear term $$\kappa _{0}/T$$ κ 0 / T exists and $$\lambda _{\text {L}}$$ λ L follows a power-law $$T^n$$ T n (T: temperature) with n = 2.66 at $$T \le \frac{1}{3}T_c$$ T ≤ 1 3 T c , supporting nodeless superconductivity. Moreover, the magnetic-field dependence of $$\kappa _{0}$$ κ 0 /T clearly shows a shoulder-like feature at a low field region. The temperature dependent $$H_{c2}$$ H c 2 curves for both in-plane and out-of-plane field directions exhibit clear upward curvatures near $$T_c$$ T c , consistent with the shape predicted by the two-band theory and the anisotropy ratio between the $$H_{c2}$$ H c 2 (T) curves exhibits strong temperature-dependence. All these results coherently suggest that $$\hbox {2H-Pd}_{0.08} \hbox {TaSe}_2$$ 2H-Pd 0.08 TaSe 2 is a nodeless, multiband superconductor.

scholarly journals Imaging the formation and surface phase separation of the CE phase

2021 ◽  
Vol 6 (1) ◽  
Author(s):  
Haibiao Zhou ◽  
Qiyuan Feng ◽  
Yubin Hou ◽  
Masao Nakamura ◽  
Yoshinori Tokura ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Phase Transitions ◽  
Charge Ordering ◽  
Zero Magnetic Field ◽  
Ferromagnetic Phase ◽  
Emergent Properties ◽  
Orbital Ordering ◽  
Strong Electron ◽  
Antiferromagnetic Correlation ◽  
Ordering Transitions

AbstractThe CE phase is an extraordinary phase exhibiting the simultaneous spin, charge, and orbital ordering due to strong electron correlation. It is an ideal platform to investigate the role of the multiple orderings in the phase transitions and discover emergent properties. Here, we use a cryogenic high-field magnetic force microscope to image the phase transitions and properties of the CE phase in a Pr0.5Ca0.5MnO3 thin film. In a high magnetic field, we observed a clear suppression of magnetic susceptibility at the charge-ordering insulator transition temperature (TCOI), whereas, at the Néel temperature (TN), no significant change is observed. This observation favors the scenario of strong antiferromagnetic correlation developed below TCOI but raises questions about the Zener polaron paramagnetic phase picture. Besides, we discoverd a phase-separated surface state in the CE phase regime. Ferromagnetic phase domains residing at the surface already exist in zero magnetic field and show ultra-high magnetic anisotropy. Our results provide microscopic insights into the unconventional spin- and charge-ordering transitions and revealed essential attributes of the CE phase, highlighting unusual behaviors when multiple electronic orderings are involved.

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