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Electric susceptibility

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known as the susceptibility tensor. Many linear dielectrics are isotropic, but it is possible nevertheless for a material to display behavior that is both linear and anisotropic, or for a material to be non-linear but isotropic. Anisotropic but linear susceptibility is common in many crystals.
1990: 187:. The greater the electric susceptibility, the greater the ability of a material to polarize in response to the field, and thereby reduce the total electric field inside the material (and store energy). It is in this way that the electric susceptibility influences the electric 1684: 2453:{\displaystyle \mathbf {P} (\mathbf {r} )=\varepsilon _{0}{\frac {N\alpha (\mathbf {r} )}{1-{\frac {1}{3}}N(\mathbf {r} )\alpha (\mathbf {r} )}}\mathbf {E} (\mathbf {r} )=\varepsilon _{0}\chi _{\text{e}}(\mathbf {r} )\mathbf {E} (\mathbf {r} )} 2271: 958: 1136: 1196: 1019: 889: 2180: 281: 742: 1537: 685:{\displaystyle \mathbf {D} \ =\ \varepsilon _{0}\mathbf {E} +\mathbf {P} \ =\ \varepsilon _{0}(1+\chi _{\text{e}})\mathbf {E} \ =\ \varepsilon _{\text{r}}\varepsilon _{0}\mathbf {E} \ =\ \varepsilon \mathbf {E} } 1867: 1452: 1347: 795: 490: 2512: 2196: 2080: 2035: 1060: 441: 896: 526: 2585: 2462:
This frequency dependence of the susceptibility leads to frequency dependence of the permittivity. The shape of the susceptibility with respect to frequency characterizes the
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Plot of the dielectric constant as a function of frequency showing several resonances and plateaus, which indicate the processes that respond on the time scale of a
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is the number of molecules per unit volume contributing to the polarization. Thus, if the local electric field is parallel to the ambient electric field, we have:
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In general, a material cannot polarize instantaneously in response to an applied field, and so the more general formulation as a function of time is
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If a dielectric material is a linear dielectric, then electric susceptibility is defined as the constant of proportionality (which may be a
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In many materials the polarizability starts to saturate at high values of electric field. This saturation can be modelled by a
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This introduces a complication however, as locally the field can differ significantly from the overall applied field. We have:
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In this second definition, the polarizability would have the SI unit of C.m/V. Yet another definition exists where
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materials in which the susceptibility is not uniform in every direction. In these materials, each susceptibility
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10.1093/oso/9780198726500.001.0001/oso-9780198726500-chapter-1#oso-9780198726500-chapter-1-displaymaths-20
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Otherwise, one should find a relation between the local and the macroscopic field. In some materials, the
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Moreover, the fact that the polarization can only depend on the electric field at previous times (i.e.
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Freeman, Richard; King, James; Lafyatis, Gregory (2019). "Essentials of Electricity and Magnetism".
1860:. This demonstrates that thinking of the susceptibility in terms of its Fourier transform is useful. 2621: 2616: 2517: 2085: 375: 289: 2764: 2601: 1803: 1759: 1726: 1257:
has the dimension of a volume (m). Another definition would be to keep SI units and to integrate
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of the material and thus influences many other phenomena in that medium, from the capacitance of
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The definition of the molecular polarizability depends on the author. In the above definition,
953:{\displaystyle \mathbf {P} =N\mathbf {p} =N\varepsilon _{0}\alpha \mathbf {E} _{\text{local}},} 1693: 1463: 1394: 1287: 1240: 531: 411: 2112: 1483: 8: 2728: 2463: 2190: 338: 2037:. The upper limit of this integral can be extended to infinity as well if one defines 1374: 1354: 1220: 1200: 175:"receptive") is a dimensionless proportionality constant that indicates the degree of 2857: 2838: 2801: 2732: 2677: 1131:{\displaystyle {\frac {\chi _{\text{e}}}{3+\chi _{\text{e}}}}={\frac {N\alpha }{3}}.} 1998:
of the electric field at previous times with time-dependent susceptibility given by
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the dimension of a volume, as in the first definition, but with a value that is
1191:{\displaystyle \mathbf {p} =\varepsilon _{0}\alpha \mathbf {E_{\text{local}}} ,} 1014:{\displaystyle \chi _{\text{e}}\mathbf {E} =N\alpha \mathbf {E} _{\text{local}}} 884:{\displaystyle \mathbf {p} =\varepsilon _{0}\alpha \mathbf {E_{\text{local}}} } 806: 212: 196: 184: 2673: 2877: 2797: 1687: 1524: 2175:{\displaystyle \chi _{\text{e}}(\Delta t)=\chi _{\text{e}}\delta (\Delta t)} 276:{\displaystyle \mathbf {P} =\varepsilon _{0}\chi _{\text{e}}{\mathbf {E} },} 1530:
The standard definition of nonlinear susceptibilities in SI units is via a
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and write this relationship as a function of frequency. Due to the
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Thus only if the local field equals the ambient field can we write:
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A similar parameter exists to relate the magnitude of the induced
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Freeman, Richard; King, James; Lafyatis, Gregory (2019),
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It is more convenient in a linear system to take the
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The nonlinear susceptibilities can be generalized to
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This parameter is the 1690:materials, the built-in polarization is zero, 1140: 2787: 2507:{\displaystyle \chi _{\text{e}}(\Delta t)=0} 2075:{\displaystyle \chi _{\text{e}}(\Delta t)=0} 2697: 2695: 2693: 2111:. An instantaneous response corresponds to 1847: 1506: 800: 2030:{\displaystyle \chi _{\text{e}}(\Delta t)} 1515:. These susceptibilities are important in 1055:{\displaystyle \chi _{\text{e}}=N\alpha .} 436:{\displaystyle \varepsilon _{\textrm {r}}} 2823:"Essentials of Electricity and Magnetism" 2701: 2651: 1965: 964:is the polarization per unit volume, and 120:Learn how and when to remove this message 2788:Butcher, Paul N.; Cotter, David (1990). 2690: 1851: 2597:Application of tensor theory in physics 537:is related to the polarization density 14: 2884:Electric and magnetic fields in matter 2876: 2750: 2748: 2757:CRC Handbook of Chemistry and Physics 521:{\displaystyle \chi _{\text{e}}\ =0.} 410:The susceptibility is related to its 398:In materials where susceptibility is 1391:are expressed in the cgs system and 58:adding citations to reliable sources 29: 2829:, Oxford: Oxford University Press, 2745: 2634: 2580:{\displaystyle \chi _{\text{e}}(0)} 1435: 1330: 1179: 875: 339:electric permittivity of free space 183:material in response to an applied 24: 2729:10.1093/oso/9780198726500.003.0001 2658:Cardarelli, François (2000–2008). 2521: 2489: 2193:, the integral becomes a product, 2163: 2135: 2089: 2057: 2018: 1967: 1906: 1723:.) The first susceptibility term, 25: 2900: 2668:. pp. 524 (Section 8.1.16). 203:Definition for linear dielectrics 2790:The Elements of Nonlinear Optics 2443: 2435: 2427: 2393: 2385: 2374: 2360: 2328: 2295: 2287: 2247: 2201: 1947: 1872: 1431: 1419: 1326: 1314: 1277:{\displaystyle \varepsilon _{0}} 1175: 1153: 1001: 986: 937: 912: 901: 871: 849: 678: 661: 627: 581: 573: 549: 380: 363:{\displaystyle \chi _{\text{e}}} 330:{\displaystyle \varepsilon _{0}} 294: 265: 236: 160:{\displaystyle \chi _{\text{e}}} 34: 2704:Introduction to Electrodynamics 2275:This has a similar form to the 1994:That is, the polarization is a 370:is the electric susceptibility; 45:needs additional citations for 2814: 2792:. Cambridge University Press. 2781: 2710: 2574: 2568: 2495: 2486: 2447: 2439: 2431: 2423: 2397: 2389: 2378: 2370: 2364: 2356: 2332: 2324: 2299: 2291: 2257: 2251: 2243: 2237: 2211: 2205: 2169: 2160: 2141: 2132: 2063: 2054: 2024: 2015: 1962: 1951: 1943: 1926: 1882: 1876: 1818: 1812: 1774: 1768: 1741: 1735: 1652: 1646: 1613: 1607: 1581: 1575: 623: 604: 13: 1: 2627: 2536:{\displaystyle \Delta t<0} 2104:{\displaystyle \Delta t<0} 2466:properties of the material. 1519:and lead to effects such as 822:to the local electric field 492:so in the case of a vacuum, 387:{\displaystyle \mathbf {E} } 308:is the polarization density; 301:{\displaystyle \mathbf {P} } 7: 2723:. Oxford University Press. 2702:Griffiths, David J (2017). 2641:"Electric susceptibility". 2590: 1826:{\displaystyle \chi ^{(n)}} 1782:{\displaystyle \chi ^{(n)}} 1749:{\displaystyle \chi ^{(1)}} 1141:Ambiguity in the definition 541:by the following relation: 10: 2905: 2612:Clausius–Mossotti relation 2549:Kramers–Kronig constraints 2277:Clausius–Mossotti relation 1521:second-harmonic generation 1066:Clausius–Mossotti relation 804: 2827:Electromagnetic Radiation 2720:Electromagnetic Radiation 2674:10.1007/978-1-84628-669-8 69:"Electric susceptibility" 2798:10.1017/CBO9781139167994 2664:(2nd ed.). London: 2617:Linear response function 1848:Dispersion and causality 1513:nonlinear susceptibility 1507:Nonlinear susceptibility 828:molecular polarizability 801:Molecular polarizability 18:Nonlinear susceptibility 2837:(inactive 2024-09-12), 2644:Encyclopædia Britannica 2602:Magnetic susceptibility 1716:{\displaystyle P_{0}=0} 1473:{\displaystyle \alpha } 1404:{\displaystyle \alpha } 1297:{\displaystyle \alpha } 1250:{\displaystyle \alpha } 138:electric susceptibility 2581: 2551:on the susceptibility 2537: 2508: 2454: 2267: 2176: 2105: 2076: 2031: 1986: 1861: 1827: 1783: 1750: 1717: 1680: 1497: 1474: 1448: 1405: 1385: 1365: 1343: 1298: 1278: 1251: 1231: 1211: 1192: 1132: 1056: 1015: 954: 885: 791: 738: 686: 530:At the same time, the 522: 486: 437: 414:(dielectric constant) 394:is the electric field. 388: 364: 331: 302: 277: 161: 27:Degree of polarization 2582: 2538: 2509: 2455: 2268: 2177: 2106: 2077: 2032: 1987: 1855: 1828: 1784: 1751: 1718: 1681: 1498: 1496:{\displaystyle 4\pi } 1475: 1449: 1406: 1386: 1366: 1344: 1299: 1279: 1252: 1232: 1212: 1193: 1133: 1057: 1016: 955: 886: 792: 739: 687: 532:electric displacement 523: 487: 438: 412:relative permittivity 389: 365: 332: 303: 278: 162: 2622:Green–Kubo relations 2555: 2543:), a consequence of 2518: 2473: 2283: 2197: 2119: 2113:Dirac delta function 2086: 2041: 2002: 1868: 1804: 1760: 1727: 1694: 1538: 1484: 1464: 1415: 1411:is still defined as 1395: 1375: 1355: 1310: 1288: 1261: 1241: 1221: 1201: 1149: 1072: 1027: 972: 897: 845: 749: 699: 545: 496: 447: 418: 376: 347: 341:(electric constant); 314: 290: 232: 223:polarization density 144: 54:improve this article 2889:Physical quantities 2607:Maxwell's equations 2191:convolution theorem 1915: 2577: 2533: 2504: 2450: 2263: 2172: 2101: 2072: 2027: 1982: 1898: 1862: 1823: 1779: 1746: 1713: 1676: 1493: 1470: 1444: 1401: 1381: 1361: 1339: 1294: 1274: 1247: 1227: 1207: 1188: 1128: 1052: 1011: 950: 881: 787: 734: 682: 518: 482: 433: 384: 360: 327: 298: 273: 157: 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1969: 1964: 1960: 1957: 1953: 1949: 1945: 1941: 1938: 1934: 1931: 1928: 1919: 1913: 1908: 1905: 1901: 1895: 1891: 1887: 1884: 1881: 1878: 1874: 1849: 1846: 1820: 1817: 1814: 1810: 1789:have units of 1776: 1773: 1770: 1766: 1743: 1740: 1737: 1733: 1712: 1709: 1704: 1700: 1675: 1672: 1669: 1664: 1660: 1654: 1651: 1648: 1644: 1638: 1634: 1630: 1625: 1621: 1615: 1612: 1609: 1605: 1599: 1595: 1591: 1588: 1583: 1580: 1577: 1573: 1567: 1563: 1559: 1554: 1550: 1546: 1543: 1525:laser pointers 1508: 1505: 1492: 1489: 1469: 1443: 1433: 1428: 1425: 1421: 1400: 1380: 1360: 1338: 1328: 1323: 1320: 1316: 1293: 1271: 1267: 1246: 1226: 1206: 1187: 1177: 1172: 1167: 1163: 1159: 1155: 1142: 1139: 1127: 1122: 1118: 1115: 1109: 1097: 1093: 1090: 1080: 1051: 1048: 1045: 1042: 1033: 1003: 998: 995: 992: 988: 978: 949: 939: 934: 929: 925: 921: 918: 914: 910: 907: 903: 873: 868: 863: 859: 855: 851: 838: 807:Polarizability 805:Main article: 802: 799: 798: 797: 780: 776: 773: 767: 755: 744: 731: 727: 717: 710: 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2254: 2240: 2228: 2222: 2218: 2214: 2208: 2192: 2188: 2183: 2166: 2157: 2148: 2144: 2138: 2123: 2114: 2098: 2095: 2092: 2069: 2066: 2060: 2045: 2021: 2006: 1997: 1992: 1979: 1975: 1972: 1958: 1955: 1939: 1936: 1932: 1929: 1917: 1911: 1903: 1899: 1893: 1889: 1885: 1879: 1859: 1854: 1845: 1843: 1837: 1815: 1808: 1799: 1794: 1771: 1764: 1738: 1731: 1710: 1707: 1702: 1698: 1689: 1688:ferroelectric 1673: 1670: 1667: 1662: 1658: 1649: 1642: 1636: 1632: 1628: 1623: 1619: 1610: 1603: 1597: 1593: 1589: 1586: 1578: 1571: 1565: 1561: 1557: 1552: 1548: 1544: 1541: 1533: 1528: 1526: 1522: 1518: 1514: 1504: 1490: 1487: 1467: 1459: 1454: 1441: 1426: 1423: 1398: 1378: 1358: 1349: 1336: 1321: 1318: 1305: 1291: 1269: 1265: 1244: 1224: 1204: 1185: 1170: 1165: 1161: 1157: 1138: 1125: 1120: 1116: 1113: 1107: 1095: 1091: 1088: 1078: 1067: 1062: 1049: 1046: 1043: 1040: 1031: 1021: 996: 993: 990: 976: 967: 963: 947: 932: 927: 923: 919: 916: 908: 905: 891: 866: 861: 857: 853: 841:is given by: 837: 833: 829: 825: 821: 817: 814: 813:dipole moment 808: 778: 774: 771: 765: 753: 745: 729: 725: 715: 708: 702: 695: 694: 693: 674: 668: 655: 651: 641: 634: 614: 610: 607: 599: 595: 588: 577: 567: 563: 556: 540: 536: 533: 528: 515: 512: 500: 479: 476: 467: 463: 451: 422: 413: 408: 405: 401: 372: 351: 343: 340: 322: 318: 310: 286: 285: 284: 270: 254: 248: 244: 240: 227: 224: 221: 217: 214: 210: 200: 198: 194: 190: 186: 182: 178: 174: 173:susceptibilis 170: 148: 139: 135: 124: 121: 113: 110:November 2010 102: 99: 95: 92: 88: 85: 81: 78: 74: 71: â€“  70: 66: 65:Find sources: 59: 55: 49: 48: 43:This article 41: 37: 32: 31: 19: 2848:, retrieved 2826: 2816: 2789: 2783: 2772:. Retrieved 2765:the original 2756: 2719: 2712: 2703: 2660: 2653: 2642: 2636: 2468: 2461: 2274: 2184: 1993: 1863: 1835: 1833:becomes an ( 1795: 1529: 1512: 1510: 1455: 1350: 1306: 1144: 1063: 1022: 965: 961: 892: 835: 831: 827: 823: 815: 810: 538: 534: 529: 409: 397: 225: 215: 206: 189:permittivity 177:polarization 172: 137: 131: 116: 107: 97: 90: 83: 76: 64: 52:Please help 47:verification 44: 1996:convolution 1798:anisotropic 1686:(Except in 400:anisotropic 2878:Categories 2850:2022-02-18 2774:2016-08-19 2628:References 2547:, imposes 2464:dispersion 1456:Using the 228:such that 220:dielectric 193:capacitors 181:dielectric 80:newspapers 2560:χ 2545:causality 2522:Δ 2490:Δ 2478:χ 2415:χ 2405:ε 2368:α 2341:− 2322:α 2307:ε 2255:ω 2241:ω 2229:χ 2219:ε 2209:ω 2164:Δ 2158:δ 2149:χ 2136:Δ 2124:χ 2090:Δ 2058:Δ 2046:χ 2019:Δ 2007:χ 1933:− 1918:χ 1907:∞ 1904:− 1900:∫ 1890:ε 1840:)-degree 1809:χ 1765:χ 1732:χ 1671:⋯ 1643:χ 1633:ε 1604:χ 1594:ε 1572:χ 1562:ε 1491:π 1468:α 1458:cgs units 1427:α 1399:α 1322:α 1292:α 1266:ε 1245:α 1171:α 1162:ε 1117:α 1096:χ 1079:χ 1047:α 1032:χ 997:α 977:χ 933:α 924:ε 867:α 858:ε 779:χ 754:ε 726:ε 716:ε 703:ε 675:ε 652:ε 642:ε 615:χ 596:ε 564:ε 501:χ 477:− 468:ε 452:χ 423:ε 352:χ 319:ε 255:χ 245:ε 149:χ 2858:citation 2591:See also 1976:′ 1959:′ 1940:′ 820:molecule 1503:lower. 692:where 337:is the 195:to the 136:), the 94:scholar 2841:  2804:  2735:  2680:  1858:period 1842:tensor 1460:gives 960:where 769:  763:  712:  706:  672:  666:  638:  632:  592:  586:  560:  554:  510:  461:  404:tensor 283:where 209:tensor 96:  89:  82:  75:  67:  2768:(PDF) 2761:(PDF) 1791:(m/V) 1436:local 1331:local 1284:into 1180:local 1007:local 943:local 876:local 839:local 179:of a 169:Latin 101:JSTOR 87:books 2864:link 2839:ISBN 2802:ISBN 2733:ISBN 2678:ISBN 2528:< 2514:for 2096:< 2082:for 1371:and 1217:and 73:news 2831:doi 2794:doi 2725:doi 2670:doi 1838:+ 1 1527:). 443:by 56:by 2880:: 2860:}} 2856:{{ 2825:, 2800:. 2747:^ 2731:. 2692:^ 2676:. 2587:. 2279:: 2182:. 1844:. 1793:. 1304:: 516:0. 199:. 171:: 167:; 2866:) 2833:: 2810:. 2796:: 2777:. 2741:. 2727:: 2686:. 2672:: 2647:. 2575:) 2572:0 2569:( 2564:e 2531:0 2525:t 2502:0 2499:= 2496:) 2493:t 2487:( 2482:e 2448:) 2444:r 2440:( 2436:E 2432:) 2428:r 2424:( 2419:e 2409:0 2401:= 2398:) 2394:r 2390:( 2386:E 2379:) 2375:r 2371:( 2365:) 2361:r 2357:( 2354:N 2349:3 2346:1 2338:1 2333:) 2329:r 2325:( 2319:N 2311:0 2303:= 2300:) 2296:r 2292:( 2288:P 2261:. 2258:) 2252:( 2248:E 2244:) 2238:( 2233:e 2223:0 2215:= 2212:) 2206:( 2202:P 2170:) 2167:t 2161:( 2153:e 2145:= 2142:) 2139:t 2133:( 2128:e 2099:0 2093:t 2070:0 2067:= 2064:) 2061:t 2055:( 2050:e 2025:) 2022:t 2016:( 2011:e 1980:. 1973:t 1968:d 1963:) 1956:t 1952:( 1948:E 1944:) 1937:t 1930:t 1927:( 1922:e 1912:t 1894:0 1886:= 1883:) 1880:t 1877:( 1873:P 1836:n 1819:) 1816:n 1813:( 1775:) 1772:n 1769:( 1742:) 1739:1 1736:( 1711:0 1708:= 1703:0 1699:P 1674:. 1668:+ 1663:3 1659:E 1653:) 1650:3 1647:( 1637:0 1629:+ 1624:2 1620:E 1614:) 1611:2 1608:( 1598:0 1590:+ 1587:E 1582:) 1579:1 1576:( 1566:0 1558:+ 1553:0 1549:P 1545:= 1542:P 1488:4 1442:. 1432:E 1424:= 1420:p 1379:E 1359:p 1337:. 1327:E 1319:= 1315:p 1270:0 1225:E 1205:p 1186:, 1176:E 1166:0 1158:= 1154:p 1126:. 1121:3 1114:N 1108:= 1100:e 1092:+ 1089:3 1083:e 1050:. 1044:N 1041:= 1036:e 1002:E 994:N 991:= 987:E 981:e 966:N 962:P 948:, 938:E 928:0 920:N 917:= 913:p 909:N 906:= 902:P 872:E 862:0 854:= 850:p 836:E 832:α 830:( 824:E 816:p 783:e 775:+ 772:1 766:= 758:r 730:0 720:r 709:= 679:E 669:= 662:E 656:0 646:r 635:= 628:E 624:) 619:e 611:+ 608:1 605:( 600:0 589:= 582:P 578:+ 574:E 568:0 557:= 550:D 539:P 535:D 513:= 505:e 480:1 472:r 464:= 456:e 428:r 381:E 356:e 323:0 295:P 271:, 266:E 259:e 249:0 241:= 237:P 226:P 216:E 153:e 140:( 123:) 117:( 112:) 108:( 98:· 91:· 84:· 77:· 50:. 20:)

Index

Nonlinear susceptibility

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electromagnetism
Latin
polarization
dielectric
electric field
permittivity
capacitors
speed of light
tensor
electric field
dielectric
polarization density
electric permittivity of free space
anisotropic
tensor
relative permittivity
electric displacement
Polarizability

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